Q1
PHYSICS
Unit 12: Current Electricity
Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is
↻ Repeated question — also appeared in
2018 (10 sets)
- A. 250 Ω
- B. 40 Ω
- C. 500 Ω
- D. 25 Ω
Correct answer & explanation hidden
Log in to view solution →
Q2
PHYSICS
Unit 13: Magnetic Effects of Current and Magnetism
A metallic rod of mass per unit length 0.5 kg m⁻¹ is lying horizontally on a smooth inclined plane which makes an angle of 30° with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 14.76 A
- B. 7.14 A
- C. 11.32 A
- D. 5.98 A
Correct answer & explanation hidden
Log in to view solution →
Q3
PHYSICS
Unit 14: Electromagnetic Induction and Alternating Currents
An inductor 20 mH, a capacitor 100 μF and a resistor 50 Ω are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 2.74 W
- B. 0.79 W
- C. 1.13 W
- D. 0.43 W
Correct answer & explanation hidden
Log in to view solution →
Q4
PHYSICS
Unit 13: Magnetic Effects of Current and Magnetism
A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from
↻ Repeated question — also appeared in
2018 (14 sets)
- A. the lattice structure of the material of the rod
- B. the current source
- C. the induced electric field due to the changing magnetic field
- D. the magnetic field
Correct answer & explanation hidden
Log in to view solution →
Q5
PHYSICS
Unit 16: Optics
The refractive index of the material of a prism is √2 and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 30°
- B. 60°
- C. zero
- D. 45°
Correct answer & explanation hidden
Log in to view solution →
Q5
PHYSICS
Unit 16: Optics
The refractive index of the material of a prism is 2 and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 30°
- B. 60°
- C. zero
- D. 45°
Correct answer & explanation hidden
Log in to view solution →
Q6
PHYSICS
Unit 15: Electromagnetic Waves
An em wave is propagating in a medium with a velocity vector V = V î. The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along
↻ Repeated question — also appeared in
2018 (16 sets)
- A. – y direction
- B. – z direction
- C. – x direction
- D. + z direction
Correct answer & explanation hidden
Log in to view solution →
Q6
PHYSICS
Unit 15: Electromagnetic Waves
An em wave is propagating in a medium with a velocity V = V(i-hat). The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along
↻ Repeated question — also appeared in
2018 (16 sets)
- A. – y direction
- B. – z direction
- C. – x direction
- D. + z direction
Correct answer & explanation hidden
Log in to view solution →
Q7
PHYSICS
Unit 16: Optics
An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 30 cm towards the mirror
- B. 30 cm away from the mirror
- C. 36 cm towards the mirror
- D. 36 cm away from the mirror
Correct answer & explanation hidden
Log in to view solution →
Q7
PHYSICS
Unit 16: Optics
An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 30 cm towards the mirror
- B. 30 cm away from the mirror
- C. 36 cm towards the mirror
- D. 36 cm away from the mirror
Correct answer & explanation hidden
Log in to view solution →
Q8
PHYSICS
Unit 14: Electromagnetic Induction and Alternating Currents
The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance
↻ Repeated question — also appeared in
2018 (11 sets)
- A. 1.389 H
- B. 0.138 H
- C. 13.89 H
- D. 138.88 H
Correct answer & explanation hidden
Log in to view solution →
Q9
PHYSICS
Unit 17: Dual Nature of Matter and Radiation
An electron of mass m with an initial velocity V = V0(i-hat) (V0 > 0) enters an electric field E = –E0(i-hat) (E0 = constant > 0) at t = 0. If λ0 is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is
↻ Repeated question — also appeared in
2018 (11 sets)
- A. λ0 t
- B. λ0 / (1 + eE0t/mV0)
- C. λ0
- D. λ0 (1 + eE0t/mV0)
Correct answer & explanation hidden
Log in to view solution →
Q10
PHYSICS
Unit 17: Dual Nature of Matter and Radiation
When the light of frequency 2v0 (where v0 is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is v1. When the frequency of the incident radiation is increased to 5v0, the maximum velocity of electrons emitted from the same plate is v2. The ratio of v1 to v2 is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 4 : 1
- B. 1 : 2
- C. 2 : 1
- D. 1 : 4
Correct answer & explanation hidden
Log in to view solution →
Q11
PHYSICS
Unit 18: Atoms and Nuclei
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 30
- B. 20
- C. 15
- D. 10
Correct answer & explanation hidden
Log in to view solution →
Q12
PHYSICS
Unit 18: Atoms and Nuclei
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 2 : – 1
- B. 1 : 1
- C. 1 : – 2
- D. 1 : – 1
Correct answer & explanation hidden
Log in to view solution →
Q13
PHYSICS
Unit 16: Optics
Unpolarised light is incident from air on a plane surface of a material of refractive index ‘μ’. At a particular angle of incidence ‘i’, it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. i = sin–1(1/μ)
- B. Reflected light is polarised with its electric vector parallel to the plane of incidence
- C. i = tan–1(μ)
- D. Reflected light is polarised with its electric vector perpendicular to the plane of incidence
Correct answer & explanation hidden
Log in to view solution →
Q14
PHYSICS
Unit 16: Optics
In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same λ and D) the separation between the slits needs to be changed to
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 2.1 mm
- B. 1.8 mm
- C. 1.7 mm
- D. 1.9 mm
Correct answer & explanation hidden
Log in to view solution →
Q15
PHYSICS
Unit 16: Optics
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
↻ Repeated question — also appeared in
2018 (15 sets)
- A. large focal length and large diameter
- B. small focal length and large diameter
- C. small focal length and small diameter
- D. large focal length and small diameter
Correct answer & explanation hidden
Log in to view solution →
Q16
PHYSICS
Unit 8: Thermodynamics
The power radiated by a black body is P and it radiates maximum energy at wavelength, λ0. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 3/4 λ0, the power radiated by it becomes nP. The value of n is
↻ Repeated question — also appeared in
2018 (13 sets)
- A. 81/256
- B. 4/3
- C. 256/81
- D. 3/4
Correct answer & explanation hidden
Log in to view solution →
Q16
PHYSICS
Unit 8: Thermodynamics
The power radiated by a black body is P and it radiates maximum energy at wavelength λ₀. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength (3/4)λ₀, the power radiated by it becomes nP. The value of n is
↻ Repeated question — also appeared in
2018 (13 sets)
- A. 81/256
- B. 4/3
- C. 256/81
- D. 3/4
Correct answer & explanation hidden
Log in to view solution →
Q17
PHYSICS
Unit 7: Properties of Solids and Liquids
Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by Δl on applying a force F, how much force is needed to stretch the second wire by the same amount?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 4 F
- B. 9 F
- C. F
- D. 6 F
Correct answer & explanation hidden
Log in to view solution →
Q17
PHYSICS
Unit 7: Properties of Solids and Liquids
Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by Δl on applying a force F, how much force is needed to stretch the second wire by the same amount?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 4 F
- B. 9 F
- C. F
- D. 6 F
Correct answer & explanation hidden
Log in to view solution →
Q18
PHYSICS
Unit 7: Properties of Solids and Liquids
A small sphere of radius ‘r’ falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to
↻ Repeated question — also appeared in
2018 (16 sets)
- A. r^5
- B. r^3
- C. r^4
- D. r^2
Correct answer & explanation hidden
Log in to view solution →
Q18
PHYSICS
Unit 7: Properties of Solids and Liquids
A small sphere of radius ‘r’ falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to
↻ Repeated question — also appeared in
2018 (16 sets)
- A. r⁵
- B. r³
- C. r⁴
- D. r²
Correct answer & explanation hidden
Log in to view solution →
Q19
PHYSICS
Unit 8: Thermodynamics
A sample of 0.1 g of water at 100°C and normal pressure (1.013 x 10^5 Nm^-2) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample, is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 42.2 J
- B. 104.3 J
- C. 84.5 J
- D. 208.7
Correct answer & explanation hidden
Log in to view solution →
Q19
PHYSICS
Unit 8: Thermodynamics
A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 10⁵ Nm⁻²) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 42.2 J
- B. 104.3 J
- C. 84.5 J
- D. 208.7 J
Correct answer & explanation hidden
Log in to view solution →
Q21
PHYSICS
Unit 5: Rotational Motion
A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy (Kt) as well as rotational kinetic energy (Kr) simultaneously. The ratio Kt : (Kt + Kr) for the sphere is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 10 : 7
- B. 7 : 10
- C. 2 : 5
- D. 5 : 7
Correct answer & explanation hidden
Log in to view solution →
Q22
PHYSICS
Unit 5: Rotational Motion
A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Rotational kinetic energy
- B. Angular velocity
- C. Angular momentum
- D. Moment of inertia
Correct answer & explanation hidden
Log in to view solution →
Q24
PHYSICS
Unit 5: Rotational Motion
The moment of the force, F = 4i + 5j - 6k at (2, 0, -3), about the point (2, -2, -2), is given by
↻ Repeated question — also appeared in
2018 (13 sets)
- A. -7i - 8j - 4k
- B. -8i - 4j - 7k
- C. -7i - 4j - 8k
- D. -4i - j - 8k
Correct answer & explanation hidden
Log in to view solution →
Q25
PHYSICS
Unit 20: Experimental Skills
A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of -0.004 cm, the correct diameter of the ball is
↻ Repeated question — also appeared in
2018 (8 sets)
- A. 0.053 cm
- B. 0.521 cm
- C. 0.529 cm
- D. 0.525 cm
Correct answer & explanation hidden
Log in to view solution →
Q27
PHYSICS
Unit 2: Kinematics
A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field E. Due to the force qE, its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively
↻ Repeated question — also appeared in
2018 (13 sets)
- A. 1 m/s, 3.5 m/s
- B. 2 m/s, 4 m/s
- C. 1.5 m/s, 3 m/s
- D. 1 m/s, 3 m/s
Correct answer & explanation hidden
Log in to view solution →
Q28
PHYSICS
Unit 10: Oscillations and Waves
A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27°C two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27°C is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 350 m/s
- B. 330 m/s
- C. 300 m/s
- D. 339 m/s
Correct answer & explanation hidden
Log in to view solution →
Q28
PHYSICS
Unit 10: Oscillations and Waves
A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27 °C two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27 °C is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 350 m/s
- B. 330 m/s
- C. 300 m/s
- D. 339 m/s
Correct answer & explanation hidden
Log in to view solution →
Q29
PHYSICS
Unit 11: Electrostatics
The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. proportional to the square root of the distance between the plates.
- B. independent of the distance between the plates.
- C. inversely proportional to the distance between the plates.
- D. linearly proportional to the distance between the plates.
Correct answer & explanation hidden
Log in to view solution →
Q29
PHYSICS
Unit 11: Electrostatics
The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. proportional to the square root of the distance between the plates.
- B. independent of the distance between the plates.
- C. inversely proportional to the distance between the plates.
- D. linearly proportional to the distance between the plates.
Correct answer & explanation hidden
Log in to view solution →
Q30
PHYSICS
Unit 11: Electrostatics
An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is
↻ Repeated question — also appeared in
2018 (14 sets)
- A. 10 times greater
- B. smaller
- C. equal
- D. 5 times greater
Correct answer & explanation hidden
Log in to view solution →
Q31
PHYSICS
Unit 10: Oscillations and Waves
A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is 20 m/s² at a distance of 5 m from the mean position. The time period of oscillation is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 2 s
- B. 2π s
- C. 1 s
- D. π s
Correct answer & explanation hidden
Log in to view solution →
Q33
PHYSICS
Unit 12: Current Electricity
A carbon resistor of (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Yellow – Green – Violet – Gold
- B. Violet – Yellow – Orange – Silver
- C. Green – Orange – Violet – Gold
- D. Yellow – Violet – Orange – Silver
Correct answer & explanation hidden
Log in to view solution →
Q34
PHYSICS
Unit 12: Current Electricity
A set of ‘n’ equal resistors, of value ‘R’ each, are connected in series to a battery of emf ‘E’ and internal resistance ‘R’. The current drawn is I. Now, the ‘n’ resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. The value of ‘n’ is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 20
- B. 10
- C. 9
- D. 11
Correct answer & explanation hidden
Log in to view solution →
Q37
PHYSICS
Unit 10: Oscillations and Waves
The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 12.5 cm
- B. 13.2 cm
- C. 16 cm
- D. 8 cm
Correct answer & explanation hidden
Log in to view solution →
Q38
PHYSICS
Unit 8: Thermodynamics
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 6.25%
- B. 26.8%
- C. 12.5%
- D. 20%
Correct answer & explanation hidden
Log in to view solution →
Q39
PHYSICS
Unit 3: Laws of Motion
A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be
↻ Repeated question — also appeared in
2018 (10 sets)
- A. 0.8
- B. 0.5
- C. 0.4
- D. 0.25
Correct answer & explanation hidden
Log in to view solution →
Q40
PHYSICS
Unit 2: Kinematics
A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to
- A. 5/7 D
- B. 2/3 D
- C. 4/5 D
- D. D
Correct answer & explanation hidden
Log in to view solution →
Q41
PHYSICS
Unit 5: Rotational Motion
Three objects, A : (a solid sphere), B : (a thin circular disk) and C : (a circular ring), each have the same mass M and radius R. They all spin with the same angular speed about their own symmetry axes. The amounts of work (W) required to bring them to rest, would satisfy the relation
↻ Repeated question — also appeared in
2018 (16 sets)
- A. W_B > W_A > W_C
- B. W_C > W_B > W_A
- C. W_A > W_C > W_B
- D. W_A > W_B > W_C
Correct answer & explanation hidden
Log in to view solution →
Q41
PHYSICS
Unit 5: Rotational Motion
Three objects, A: (a solid sphere), B: (a thin circular disk) and C: (a circular ring), each have the same mass M and radius R. They all spin with the same angular speed ω about their own symmetry axes. The amounts of work (W) required to bring them to rest, would satisfy the relation
↻ Repeated question — also appeared in
2018 (16 sets)
- A. W_B > W_A > W_C
- B. W_C > W_B > W_A
- C. W_A > W_C > W_B
- D. W_A > W_B > W_C
Correct answer & explanation hidden
Log in to view solution →
Q42
PHYSICS
Unit 3: Laws of Motion
Which one of the following statements is incorrect?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Frictional force opposes the relative motion.
- B. Rolling friction is smaller than sliding friction.
- C. Coefficient of sliding friction has dimensions of length.
- D. Limiting value of static friction is directly proportional to normal reaction.
Correct answer & explanation hidden
Log in to view solution →
Q42
PHYSICS
Unit 3: Laws of Motion
Which one of the following statements is incorrect?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Frictional force opposes the relative motion.
- B. Rolling friction is smaller than sliding friction.
- C. Coefficient of sliding friction has dimensions of length.
- D. Limiting value of static friction is directly proportional to normal reaction.
Correct answer & explanation hidden
Log in to view solution →
Q45
PHYSICS
Unit 19: Electronic Devices
In a p-n junction diode, change in temperature due to heating
↻ Repeated question — also appeared in
2018 (15 sets)
- A. does not affect resistance of p-n junction
- B. affects only reverse resistance
- C. affects the overall V – I characteristics of p-n junction
- D. affects only forward resistance
Correct answer & explanation hidden
Log in to view solution →
Q46
BIOLOGY
Unit 5: Human Physiology
Match the items given in Column I with those in Column II and select the correct option given below:
↻ Repeated question — also appeared in
2018 (4 sets)
- A. (1) v iv i ii
- B. (2) iv v ii iii
- C. (3) v iv i iii
- D. (4) iv i ii iii
Correct answer & explanation hidden
Log in to view solution →
Q47
BIOLOGY
Unit 5: Human Physiology
Match the items given in Column I with those in Column II and select the correct option given below:
↻ Repeated question — also appeared in
2018 (4 sets)
- A. (1) ii iii i iv
- B. (2) iii ii iv i
- C. (3) iv i ii iii
- D. (4) i ii iii iv
Correct answer & explanation hidden
Log in to view solution →
Q48
BIOLOGY
Unit 5: Human Physiology
Which of the following is an amino acid derived hormone?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Estradiol
- B. Epinephrine
- C. Estriol
- D. Ecdysone
Correct answer & explanation hidden
Log in to view solution →
Q49
BIOLOGY
Unit 5: Human Physiology
Which of the following hormones can play a significant role in osteoporosis?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Estrogen and Parathyroid hormone
- B. Aldosterone and Prolactin
- C. Parathyroid hormone and Prolactin
- D. Progesterone and Aldosterone
Correct answer & explanation hidden
Log in to view solution →
Q50
BIOLOGY
Unit 5: Human Physiology
Which of the following structures or regions is incorrectly paired with its function?
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Hypothalamus : production of releasing hormones and regulation of temperature, hunger and thirst.
- B. Medulla oblongata : controls respiration and cardiovascular reflexes.
- C. Corpus callosum : band of fibers connecting left and right cerebral hemispheres.
- D. Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement.
Correct answer & explanation hidden
Log in to view solution →
Q51
BIOLOGY
Unit 5: Human Physiology
The transparent lens in the human eye is held in its place by
↻ Repeated question — also appeared in
2018 (15 sets)
- A. smooth muscles attached to the iris
- B. ligaments attached to the ciliary body
- C. smooth muscles attached to the ciliary body
- D. ligaments attached to the iris
Correct answer & explanation hidden
Log in to view solution →
Q52
BIOLOGY
Unit 7: Genetics and Evolution
AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. ACCUAUGCGAU
- B. AGGUAUCGCAU
- C. UCCAUAGCGUA
- D. UGGTUTCGCAT
Correct answer & explanation hidden
Log in to view solution →
Q52
BIOLOGY
Unit 7: Genetics and Evolution
AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. ACCUAUGCGAU
- B. AGGUAUCGCAU
- C. UCCAUAGCGUA
- D. UGGTUTCGCAT
Correct answer & explanation hidden
Log in to view solution →
Q53
BIOLOGY
Unit 7: Genetics and Evolution
All of the following are part of an operon except
↻ Repeated question — also appeared in
2018 (13 sets)
- A. an enhancer
- B. an operator
- C. a promoter
- D. structural genes
Correct answer & explanation hidden
Log in to view solution →
Q53
BIOLOGY
Unit 7: Genetics and Evolution
All of the following are part of an operon except
↻ Repeated question — also appeared in
2018 (13 sets)
- A. an enhancer
- B. an operator
- C. a promoter
- D. structural genes
Correct answer & explanation hidden
Log in to view solution →
Q54
BIOLOGY
Unit 7: Genetics and Evolution
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Only grandchildren
- B. Only daughters
- C. Both sons and daughters
- D. Only sons
Correct answer & explanation hidden
Log in to view solution →
Q54
BIOLOGY
Unit 7: Genetics and Evolution
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Only grandchildren
- B. Only daughters
- C. Both sons and daughters
- D. Only sons
Correct answer & explanation hidden
Log in to view solution →
Q55
BIOLOGY
Unit 5: Human Physiology
Match the items given in Column I with those in Column II: Column I: a. Proliferative Phase, b. Secretory Phase, c. Menstruation. Column II: i. Breakdown of endometrial lining, ii. Follicular Phase, iii. Luteal Phase.
↻ Repeated question — also appeared in
2018 (1 set)
- A. ii iii i
- B. iii ii i
- C. iii i ii
- D. i iii ii
Correct answer & explanation hidden
Log in to view solution →
Q56
BIOLOGY
Unit 7: Genetics and Evolution
According to Hugo de Vries, the mechanism of evolution is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Phenotypic variations
- B. Multiple step mutations
- C. Minor mutations
- D. Saltation
Correct answer & explanation hidden
Log in to view solution →
Q56
BIOLOGY
Unit 7: Genetics and Evolution
According to Hugo de Vries, the mechanism of evolution is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Phenotypic variations
- B. Multiple step mutations
- C. Minor mutations
- D. Saltation
Correct answer & explanation hidden
Log in to view solution →
Q57
BIOLOGY
Unit 7: Genetics and Evolution
Among the following sets of examples for divergent evolution, select the incorrect option:
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Brain of bat, man and cheetah
- B. Forelimbs of man, bat and cheetah
- C. Eye of octopus, bat and man
- D. Heart of bat, man and cheetah
Correct answer & explanation hidden
Log in to view solution →
Q58
BIOLOGY
Unit 7: Genetics and Evolution
The similarity of bone structure in the forelimbs of many vertebrates is an example of
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Convergent evolution
- B. Homology
- C. Adaptive radiation
- D. Analogy
Correct answer & explanation hidden
Log in to view solution →
Q59
BIOLOGY
Unit 5: Human Physiology
Which of the following is not an autoimmune disease?
↻ Repeated question — also appeared in
2018 (8 sets)
- A. Alzheimer’s disease
- B. Psoriasis
- C. Vitiligo
- D. Rheumatoid arthritis
Correct answer & explanation hidden
Log in to view solution →
Q60
BIOLOGY
Unit 7: Genetics and Evolution
Which of the following characteristics represent ‘Inheritance of blood groups’ in humans? a. Dominance, b. Co-dominance, c. Multiple allele, d. Incomplete dominance, e. Polygenic inheritance.
↻ Repeated question — also appeared in
2018 (13 sets)
- A. b, d and e
- B. b, c and e
- C. a, c and e
- D. a, b and c
Correct answer & explanation hidden
Log in to view solution →
Q61
BIOLOGY
Unit 8: Biology and Human Welfare
Conversion of milk to curd improves its nutritional value by increasing the amount of
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Vitamin B12
- B. Vitamin D
- C. Vitamin E
- D. Vitamin A
Correct answer & explanation hidden
Log in to view solution →
Q62
BIOLOGY
Unit 5: Human Physiology
In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels?
↻ Repeated question — also appeared in
2018 (4 sets)
- A. Ringworm disease
- B. Elephantiasis
- C. Amoebiasis
- D. Ascariasis
Correct answer & explanation hidden
Log in to view solution →
Q63
BIOLOGY
Unit 10: Ecology and Environment
All of the following are included in ‘Ex-situ conservation’ except
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Botanical gardens
- B. Wildlife safari parks
- C. Seed banks
- D. Sacred groves
Correct answer & explanation hidden
Log in to view solution →
Q64
BIOLOGY
Unit 10: Ecology and Environment
Match the items given in Column I with those in Column II: Column I: a. Eutrophication, b. Sanitary landfill, c. Snow blindness, d. Jhum cultivation. Column II: i. UV-B radiation, ii. Deforestation, iii. Nutrient enrichment, iv. Waste disposal.
↻ Repeated question — also appeared in
2018 (11 sets)
- A. iii iv i ii
- B. ii i iii iv
- C. i ii iv iii
- D. i iii iv ii
Correct answer & explanation hidden
Log in to view solution →
Q65
BIOLOGY
Unit 10: Ecology and Environment
In a growing population of a country,
↻ Repeated question — also appeared in
2018 (15 sets)
- A. reproductive and pre -reproductive individuals are equal in number.
- B. pre-reproductive individuals are more than the reproductive individuals.
- C. pre-reproductive individuals are less than the reproductive individuals.
- D. reproductive individuals are less than the post-reproductive individuals.
Correct answer & explanation hidden
Log in to view solution →
Q66
BIOLOGY
Unit 5: Human Physiology
Which part of poppy plant is used to obtain the drug ‘‘Smack’’?
- A. Roots
- B. Flowers
- C. Leaves
- D. Latex
Correct answer & explanation hidden
Log in to view solution →
Q67
BIOLOGY
Unit 10: Ecology and Environment
Which one of the following population interactions is widely used in medical science for the production of antibiotics?
↻ Repeated question — also appeared in
2018 (12 sets)
- A. Parasitism
- B. Commensalism
- C. Amensalism
- D. Mutualism
Correct answer & explanation hidden
Log in to view solution →
Q68
BIOLOGY
Unit 5: Human Physiology
The contraceptive ‘SAHELI’
↻ Repeated question — also appeared in
2018 (1 set)
- A. is an IUD.
- B. blocks estrogen receptors in the uterus, preventing eggs from getting implanted.
- C. is a post-coital contraceptive.
- D. increases the concentration of estrogen and prevents ovulation in females.
Correct answer & explanation hidden
Log in to view solution →
Q69
BIOLOGY
Unit 6: Reproduction
The amnion of mammalian embryo is derived from
↻ Repeated question — also appeared in
2018 (15 sets)
- A. mesoderm and trophoblast
- B. ectoderm and mesoderm
- C. ectoderm and endoderm
- D. endoderm and mesoderm
Correct answer & explanation hidden
Log in to view solution →
Q69
BIOLOGY
Unit 6: Reproduction
The amnion of mammalian embryo is derived from
↻ Repeated question — also appeared in
2018 (15 sets)
- A. mesoderm and trophoblast
- B. ectoderm and mesoderm
- C. ectoderm and endoderm
- D. endoderm and mesoderm
Correct answer & explanation hidden
Log in to view solution →
Q70
BIOLOGY
Unit 6: Reproduction
The difference between spermiogenesis and spermiation is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed.
- B. In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
- C. In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.
- D. In spermiogenesis spermatozoa are formed, while in spermiation spermatids are formed.
Correct answer & explanation hidden
Log in to view solution →
Q70
BIOLOGY
Unit 6: Reproduction
The difference between spermiogenesis and spermiation is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed.
- B. In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
- C. In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.
- D. In spermiogenesis spermatozoa are formed, while in spermiation spermatids are formed.
Correct answer & explanation hidden
Log in to view solution →
Q71
BIOLOGY
Unit 5: Human Physiology
Hormones secreted by the placenta to maintain pregnancy are
↻ Repeated question — also appeared in
2018 (1 set)
- A. hCG, hPL, progestogens, estrogens
- B. hCG, hPL, progestogens, prolactin
- C. hCG, progestogens, estrogens, glucocorticoids
- D. hCG, hPL, estrogens, relaxin, oxytocin
Correct answer & explanation hidden
Log in to view solution →
Q71
BIOLOGY
Unit 6: Reproduction
Hormones secreted by the placenta to maintain pregnancy are
↻ Repeated question — also appeared in
2018 (13 sets)
- A. hCG, hPL, progestogens, estrogens
- B. hCG, hPL, progestogens, prolactin
- C. hCG, progestogens, estrogens, glucocorticoids
- D. hCG, hPL, estrogens, relaxin, oxytocin
Correct answer & explanation hidden
Log in to view solution →
Q72
BIOLOGY
Unit 5: Human Physiology
Match the items given in Column I with those in Column II and select the correct option given below:
Column I: a. Tricuspid valve, b. Bicuspid valve, c. Semilunar valve
Column II: i. Between left atrium and left ventricle, ii. Between right ventricle and pulmonary artery, iii. Between right atrium and right ventricle
↻ Repeated question — also appeared in
2018 (10 sets)
- A. a-i, b-ii, c-iii
- B. a-iii, b-i, c-ii
- C. a-ii, b-i, c-iii
- D. a-i, b-iii, c-ii
Correct answer & explanation hidden
Log in to view solution →
Q73
BIOLOGY
Unit 5: Human Physiology
Match the items given in Column I with those in Column II and select the correct option given below:
Column I: a. Tidal volume, b. Inspiratory Reserve volume, c. Expiratory Reserve volume, d. Residual volume
Column II: i. 2500 – 3000 mL, ii. 1100 – 1200 mL, iii. 500 – 550 mL, iv. 1000 – 1100 mL
↻ Repeated question — also appeared in
2018 (10 sets)
- A. a-i, b-iv, c-ii, d-iii
- B. a-iii, b-ii, c-i, d-iv
- C. a-iv, b-iii, c-ii, d-i
- D. a-iii, b-i, c-iv, d-ii
Correct answer & explanation hidden
Log in to view solution →
Q74
BIOLOGY
Unit 5: Human Physiology
Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Increased respiratory surface; Inflammation of bronchioles
- B. Inflammation of bronchioles; Decreased respiratory surface
- C. Decreased respiratory surface; Inflammation of bronchioles
- D. Increased number of bronchioles; Increased respiratory surface
Correct answer & explanation hidden
Log in to view solution →
Q75
BIOLOGY
Unit 5: Human Physiology
Match the items given in Column I with those in Column II and select the correct option given below:
Column I: a. Fibrinogen, b. Globulin, c. Albumin
Column II: i. Osmotic balance, ii. Blood clotting, iii. Defence mechanism
↻ Repeated question — also appeared in
2018 (10 sets)
- A. a-i, b-iii, c-ii
- B. a-iii, b-ii, c-i
- C. a-ii, b-iii, c-i
- D. a-i, b-ii, c-iii
Correct answer & explanation hidden
Log in to view solution →
Q76
BIOLOGY
Unit 5: Human Physiology
Which of the following is an occupational respiratory disorder?
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Botulism
- B. Anthracis
- C. Emphysema
- D. Silicosis
Correct answer & explanation hidden
Log in to view solution →
Q77
BIOLOGY
Unit 5: Human Physiology
Calcium is important in skeletal muscle contraction because it
↻ Repeated question — also appeared in
2018 (15 sets)
- A. detaches the myosin head from the actin filament.
- B. binds to troponin to remove the masking of active sites on actin for myosin.
- C. prevents the formation of bonds between the myosin cross bridges and the actin filament.
- D. activates the myosin ATPase by binding to it.
Correct answer & explanation hidden
Log in to view solution →
Q78
BIOLOGY
Unit 5: Human Physiology
Which of the following gastric cells indirectly help in erythropoiesis?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Goblet cells
- B. Chief cells
- C. Parietal cells
- D. Mucous cells
Correct answer & explanation hidden
Log in to view solution →
Q79
BIOLOGY
Unit 1: Diversity in Living World
Which one of these animals is not a homeotherm?
↻ Repeated question — also appeared in
2018 (7 sets)
- A. Camelus
- B. Macropus
- C. Psittacula
- D. Chelone
Correct answer & explanation hidden
Log in to view solution →
Q80
BIOLOGY
Unit 1: Diversity in Living World
Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system.
↻ Repeated question — also appeared in
2018 (9 sets)
- A. Aves
- B. Amphibia
- C. Osteichthyes
- D. Reptilia
Correct answer & explanation hidden
Log in to view solution →
Q81
BIOLOGY
Unit 1: Diversity in Living World
Ciliates differ from all other protozoans in
↻ Repeated question — also appeared in
2018 (14 sets)
- A. using pseudopodia for capturing prey
- B. using flagella for locomotion
- C. having two types of nuclei
- D. having a contractile vacuole for removing excess water
Correct answer & explanation hidden
Log in to view solution →
Q82
BIOLOGY
Unit 1: Diversity in Living World
Which of the following animals does not undergo metamorphosis?
↻ Repeated question — also appeared in
2018 (8 sets)
- A. Moth
- B. Earthworm
- C. Starfish
- D. Tunicate
Correct answer & explanation hidden
Log in to view solution →
Q83
BIOLOGY
Unit 1: Diversity in Living World
Which of the following organisms are known as chief producers in the oceans?
↻ Repeated question — also appeared in
2018 (11 sets)
- A. Cyanobacteria
- B. Dinoflagellates
- C. Euglenoids
- D. Diatoms
Correct answer & explanation hidden
Log in to view solution →
Q83
BIOLOGY
Unit 1: Diversity in Living World
Which of the following organisms are known as chief producers in the oceans?
↻ Repeated question — also appeared in
2018 (11 sets)
- A. Cyanobacteria
- B. Dinoflagellates
- C. Euglenoids
- D. Diatoms
Correct answer & explanation hidden
Log in to view solution →
Q84
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Which of the following features is used to identify a male cockroach from a female cockroach?
↻ Repeated question — also appeared in
2018 (12 sets)
- A. Forewings with darker tegmina
- B. Presence of a boat shaped sternum on the 9th abdominal segment
- C. Presence of anal cerci
- D. Presence of caudal styles
Correct answer & explanation hidden
Log in to view solution →
Q84
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Which of the following features is used to identify a male cockroach from a female cockroach?
↻ Repeated question — also appeared in
2018 (12 sets)
- A. Forewings with darker tegmina
- B. Presence of a boat shaped sternum on the 9th abdominal segment
- C. Presence of anal cerci
- D. Presence of caudal styles
Correct answer & explanation hidden
Log in to view solution →
Q85
BIOLOGY
Unit 3: Cell Structure and Function
Nissl bodies are mainly composed of
↻ Repeated question — also appeared in
2018 (11 sets)
- A. Nucleic acids and SER
- B. Proteins and lipids
- C. Free ribosomes and RER
- D. DNA and RNA
Correct answer & explanation hidden
Log in to view solution →
Q85
BIOLOGY
Unit 3: Cell Structure and Function
Nissl bodies are mainly composed of
↻ Repeated question — also appeared in
2018 (11 sets)
- A. Nucleic acids and SER
- B. Proteins and lipids
- C. Free ribosomes and RER
- D. DNA and RNA
Correct answer & explanation hidden
Log in to view solution →
Q86
BIOLOGY
Unit 3: Cell Structure and Function
Which of the following events does not occur in rough endoplasmic reticulum?
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Cleavage of signal peptide
- B. Protein folding
- C. Phospholipid synthesis
- D. Protein glycosylation
Correct answer & explanation hidden
Log in to view solution →
Q86
BIOLOGY
Unit 3: Cell Structure and Function
Which of the following events does not occur in rough endoplasmic reticulum?
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Cleavage of signal peptide
- B. Protein folding
- C. Phospholipid synthesis
- D. Protein glycosylation
Correct answer & explanation hidden
Log in to view solution →
Q87
BIOLOGY
Unit 4: Plant Physiology
Which of these statements is incorrect?
↻ Repeated question — also appeared in
2018 (12 sets)
- A. Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
- B. Enzymes of TCA cycle are present in mitochondrial matrix.
- C. Oxidative phosphorylation takes place in outer mitochondrial membrane.
- D. Glycolysis occurs in cytosol.
Correct answer & explanation hidden
Log in to view solution →
Q87
BIOLOGY
Unit 4: Plant Physiology
Which of these statements is incorrect?
↻ Repeated question — also appeared in
2018 (12 sets)
- A. Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
- B. Enzymes of TCA cycle are present in mitochondrial matrix.
- C. Oxidative phosphorylation takes place in outer mitochondrial membrane.
- D. Glycolysis occurs in cytosol.
Correct answer & explanation hidden
Log in to view solution →
Q88
BIOLOGY
Unit 5: Human Physiology
Which of the following terms describe human dentition?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Pleurodont, Monophyodont, Homodont
- B. Thecodont, Diphyodont, Homodont
- C. Pleurodont, Diphyodont, Heterodont
- D. Thecodont, Diphyodont, Heterodont
Correct answer & explanation hidden
Log in to view solution →
Q89
BIOLOGY
Unit 3: Cell Structure and Function
Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Plastidome
- B. Polysome
- C. Nucleosome
- D. Polyhedral bodies
Correct answer & explanation hidden
Log in to view solution →
Q90
BIOLOGY
Unit 3: Cell Structure and Function
Select the incorrect match :
↻ Repeated question — also appeared in
2018 (11 sets)
- A. Submetacentric – L-shaped chromosomes
- B. Lampbrush – Diplotene bivalents
- C. Polytene – Oocytes of amphibians
- D. Allosomes – Sex chromosomes
Correct answer & explanation hidden
Log in to view solution →
Q91
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Pneumatophores occur in
↻ Repeated question — also appeared in
2018 (9 sets)
- A. Carnivorous plants
- B. Halophytes
- C. Submerged hydrophytes
- D. Free-floating hydrophytes
Correct answer & explanation hidden
Log in to view solution →
Q92
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Sweet potato is a modified
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Tap root
- B. Stem
- C. Rhizome
- D. Adventitious root
Correct answer & explanation hidden
Log in to view solution →
Q93
BIOLOGY
Unit 1: Diversity in Living World
Which of the following statements is correct?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Horsetails are gymnosperms.
- B. Ovules are not enclosed by ovary wall in gymnosperms.
- C. Stems are usually unbranched in both Cycas and Cedrus.
- D. Selaginella is heterosporous, while Salvinia is homosporous.
Correct answer & explanation hidden
Log in to view solution →
Q94
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Casparian strips occur in
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Cortex
- B. Epidermis
- C. Endodermis
- D. Pericycle
Correct answer & explanation hidden
Log in to view solution →
Q95
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Secondary xylem and phloem in dicot stem are produced by
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Phellogen
- B. Apical meristems
- C. Axillary meristems
- D. Vascular cambium
Correct answer & explanation hidden
Log in to view solution →
Q96
BIOLOGY
Unit 1: Diversity in Living World
Select the wrong statement :
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Pseudopodia are locomotory and feeding structures in Sporozoans.
- B. Cell wall is present in members of Fungi and Plantae.
- C. Mitochondria are the powerhouse of the cell in all kingdoms except Monera.
- D. Mushrooms belong to Basidiomycetes.
Correct answer & explanation hidden
Log in to view solution →
Q97
BIOLOGY
Unit 2: Structural Organisation in Animals and Plants
Plants having little or no secondary growth are
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Conifers
- B. Grasses
- C. Cycads
- D. Deciduous angiosperms
Correct answer & explanation hidden
Log in to view solution →
Q98
BIOLOGY
Unit 7: Genetics and Evolution
Which of the following pairs is wrongly matched?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. XO type sex determination : Grasshopper
- B. Starch synthesis in pea : Multiple alleles
- C. T.H. Morgan : Linkage
- D. ABO blood grouping : Co-dominance
Correct answer & explanation hidden
Log in to view solution →
Q99
BIOLOGY
Unit 7: Genetics and Evolution
Select the correct statement :
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Spliceosomes take part in translation.
- B. Franklin Stahl coined the term ‘‘linkage’’.
- C. Transduction was discovered by S. Altman.
- D. Punnett square was developed by a British scientist.
Correct answer & explanation hidden
Log in to view solution →
Q100
BIOLOGY
Unit 7: Genetics and Evolution
The experimental proof for semiconservative replication of DNA was first shown in a
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Plant
- B. Fungus
- C. Virus
- D. Bacterium
Correct answer & explanation hidden
Log in to view solution →
Q101
BIOLOGY
Unit 7: Genetics and Evolution
Select the correct match :
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Matthew Meselson and F. Stahl – Pisum sativum
- B. Alec Jeffreys – Streptococcus pneumoniae
- C. Francois Jacob and Jacques Monod – Lac operon
- D. Alfred Hershey and Martha Chase – TMV
Correct answer & explanation hidden
Log in to view solution →
Q102
BIOLOGY
Unit 6: Reproduction
Offsets are produced by
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Parthenocarpy
- B. Meiotic divisions
- C. Parthenogenesis
- D. Mitotic divisions
Correct answer & explanation hidden
Log in to view solution →
Q103
BIOLOGY
Unit 6: Reproduction
Which of the following flowers only once in its life-time?
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Mango
- B. Bamboo species
- C. Papaya
- D. Jackfruit
Correct answer & explanation hidden
Log in to view solution →
Q103
BIOLOGY
Unit 6: Reproduction
Which of the following flowers only once in its life-time?
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Mango
- B. Bamboo species
- C. Papaya
- D. Jackfruit
Correct answer & explanation hidden
Log in to view solution →
Q104
BIOLOGY
Unit 6: Reproduction
Which of the following has proved helpful in preserving pollen as fossils?
↻ Repeated question — also appeared in
2018 (11 sets)
- A. Oil content
- B. Pollenkitt
- C. Sporopollenin
- D. Cellulosic intine
Correct answer & explanation hidden
Log in to view solution →
Q104
BIOLOGY
Unit 6: Reproduction
Which of the following has proved helpful in preserving pollen as fossils?
↻ Repeated question — also appeared in
2018 (11 sets)
- A. Oil content
- B. Pollenkitt
- C. Sporopollenin
- D. Cellulosic intine
Correct answer & explanation hidden
Log in to view solution →
Q105
BIOLOGY
Unit 10: Ecology and Environment
World Ozone Day is celebrated on
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 16th September
- B. 5th June
- C. 22nd April
- D. 21st April
Correct answer & explanation hidden
Log in to view solution →
Q105
BIOLOGY
Unit 10: Ecology and Environment
World Ozone Day is celebrated on
↻ Repeated question — also appeared in
2018 (16 sets)
- A. 16th September
- B. 5th June
- C. 22nd April
- D. 21st April
Correct answer & explanation hidden
Log in to view solution →
Q106
BIOLOGY
Unit 10: Ecology and Environment
Natality refers to
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Number of individuals leaving the habitat
- B. Death rate
- C. Number of individuals entering a habitat
- D. Birth rate
Correct answer & explanation hidden
Log in to view solution →
Q106
BIOLOGY
Unit 10: Ecology and Environment
Natality refers to
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Number of individuals leaving the habitat
- B. Death rate
- C. Number of individuals entering a habitat
- D. Birth rate
Correct answer & explanation hidden
Log in to view solution →
Q107
BIOLOGY
Unit 10: Ecology and Environment
What type of ecological pyramid would be obtained with the following data? Secondary consumer : 120 g, Primary consumer : 60 g, Primary producer : 10 g
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Upright pyramid of numbers
- B. Inverted pyramid of biomass
- C. Upright pyramid of biomass
- D. Pyramid of energy
Correct answer & explanation hidden
Log in to view solution →
Q107
BIOLOGY
Unit 10: Ecology and Environment
What type of ecological pyramid would be obtained with the following data? Secondary consumer: 120 g, Primary consumer: 60 g, Primary producer: 10 g
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Upright pyramid of numbers
- B. Inverted pyramid of biomass
- C. Upright pyramid of biomass
- D. Pyramid of energy
Correct answer & explanation hidden
Log in to view solution →
Q108
BIOLOGY
Unit 10: Ecology and Environment
Which of the following is a secondary pollutant?
↻ Repeated question — also appeared in
2018 (16 sets)
- A. SO2
- B. CO
- C. O3
- D. CO2
Correct answer & explanation hidden
Log in to view solution →
Q108
BIOLOGY
Unit 10: Ecology and Environment
Which of the following is a secondary pollutant?
↻ Repeated question — also appeared in
2018 (16 sets)
- A. SO2
- B. CO
- C. O3
- D. CO2
Correct answer & explanation hidden
Log in to view solution →
Q109
BIOLOGY
Unit 10: Ecology and Environment
Niche is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. the range of temperature that the organism needs to live
- B. all the biological factors in the organism’s environment
- C. the functional role played by the organism where it lives
- D. the physical space where an organism lives
Correct answer & explanation hidden
Log in to view solution →
Q110
BIOLOGY
Unit 10: Ecology and Environment
In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Fe
- B. Carbon
- C. Oxygen
- D. Cl
Correct answer & explanation hidden
Log in to view solution →
Q111
BIOLOGY
Unit 9: Biotechnology and Its Applications
The correct order of steps in Polymerase Chain Reaction (PCR) is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Denaturation, Extension, Annealing
- B. Extension, Denaturation, Annealing
- C. Denaturation, Annealing, Extension
- D. Annealing, Extension, Denaturation
Correct answer & explanation hidden
Log in to view solution →
Q112
BIOLOGY
Unit 9: Biotechnology and Its Applications
In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. Research Committee on Genetic Manipulation (RCGM)
- B. Indian Council of Medical Research (ICMR)
- C. Genetic Engineering Appraisal Committee (GEAC)
- D. Council for Scientific and Industrial Research (CSIR)
Correct answer & explanation hidden
Log in to view solution →
Q113
BIOLOGY
Unit 9: Biotechnology and Its Applications
Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. λ phage
- B. Retrovirus
- C. pBR 322
- D. Ti plasmid
Correct answer & explanation hidden
Log in to view solution →
Q114
BIOLOGY
Unit 9: Biotechnology and Its Applications
Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Biodegradation
- B. Bio-infringement
- C. Bioexploitation
- D. Biopiracy
Correct answer & explanation hidden
Log in to view solution →
Q125
CHEMISTRY
Unit 19: Biomolecules
The two functional groups characteristic of sugars are
↻ Repeated question — also appeared in
2018 (8 sets)
- A. carbonyl and phosphate
- B. hydroxyl and methyl
- C. carbonyl and hydroxyl
- D. carbonyl and methyl
Correct answer & explanation hidden
Log in to view solution →
Q125
CHEMISTRY
Unit 19: Biomolecules
The two functional groups characteristic of sugars are
↻ Repeated question — also appeared in
2018 (8 sets)
- A. carbonyl and phosphate
- B. hydroxyl and methyl
- C. carbonyl and hydroxyl
- D. carbonyl and methyl
Correct answer & explanation hidden
Log in to view solution →
Q136
CHEMISTRY
Unit 1: Some Basic Concepts in Chemistry
In which case is the number of molecules of water maximum?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. 0.00224 L of water vapours at 1 atm and 273 K
- B. 18 mL of water
- C. 10^-3 mol of water
- D. 0.18 g of water
Correct answer & explanation hidden
Log in to view solution →
Q137
CHEMISTRY
Unit 8: Chemical Kinetics
The correct difference between first- and second-order reactions is that
↻ Repeated question — also appeared in
2018 (15 sets)
- A. a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed
- B. the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations
- C. the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
- D. the half-life of a first-order reaction does not depend on [A]0; the half-life of a second-order reaction does depend on [A]0
Correct answer & explanation hidden
Log in to view solution →
Q138
CHEMISTRY
Unit 7: Redox Reactions and Electrochemistry
Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below: Then the species undergoing disproportionation is
↻ Repeated question — also appeared in
2018 (2 sets)
- A. Br2
- B. Br-3O
- C. HBrO
- D. Br-4O
Correct answer & explanation hidden
Log in to view solution →
Q139
CHEMISTRY
Unit 3: Chemical Bonding and Molecular Structure
Among CaH2, BeH2, BaH2, the order of ionic character is
↻ Repeated question — also appeared in
2018 (7 sets)
- A. BeH2 < BaH2 < CaH2
- B. BeH2 < CaH2 < BaH2
- C. BaH2 < BeH2 < CaH2
- D. CaH2 < BeH2 < BaH2
Correct answer & explanation hidden
Log in to view solution →
Q140
CHEMISTRY
Unit 11: d- and f-Block Elements
Which one of the following ions exhibits d-d transition and paramagnetism as well?
↻ Repeated question — also appeared in
2018 (8 sets)
- A. MnO4-
- B. CrO4-2
- C. MnO4-2
- D. Cr2O7-2
Correct answer & explanation hidden
Log in to view solution →
Q140
CHEMISTRY
Unit 12: Coordination Compounds
Which one of the following ions exhibits d-d transition and paramagnetism as well?
↻ Repeated question — also appeared in
2018 (5 sets)
- A. MnO4-
- B. CrO4-2
- C. MnO4-2
- D. Cr2O7-2
Correct answer & explanation hidden
Log in to view solution →
Q141
CHEMISTRY
Unit 12: Coordination Compounds
Iron carbonyl, Fe(CO)5 is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. trinuclear
- B. tetranuclear
- C. dinuclear
- D. mononuclear
Correct answer & explanation hidden
Log in to view solution →
Q141
CHEMISTRY
Unit 12: Coordination Compounds
Iron carbonyl, Fe(CO)5 is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. trinuclear
- B. tetranuclear
- C. dinuclear
- D. mononuclear
Correct answer & explanation hidden
Log in to view solution →
Q142
CHEMISTRY
Unit 12: Coordination Compounds
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code:
↻ Repeated question — also appeared in
2018 (2 sets)
- A. iv i ii iii
- B. iv v ii i
- C. iii v i ii
- D. i ii iii iv
Correct answer & explanation hidden
Log in to view solution →
Q142
CHEMISTRY
Unit 12: Coordination Compounds
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code: Column I (a) Co3+, (b) Cr3+, (c) Fe3+, (d) Ni2+; Column II (i) 8 B.M., (ii) 35 B.M., (iii) 3 B.M., (iv) 24 B.M., (v) 15 B.M.
↻ Repeated question — also appeared in
2018 (7 sets)
- A. (1) iv i ii iii
- B. (2) iv v ii i
- C. (3) iii v i ii
- D. (4) i ii iii iv
Correct answer & explanation hidden
Log in to view solution →
Q143
CHEMISTRY
Unit 12: Coordination Compounds
The geometry and magnetic behaviour of the complex [Ni(CO)4] are
↻ Repeated question — also appeared in
2018 (16 sets)
- A. square planar geometry and paramagnetic
- B. square planar geometry and diamagnetic
- C. tetrahedral geometry and paramagnetic
- D. tetrahedral geometry and diamagnetic
Correct answer & explanation hidden
Log in to view solution →
Q143
CHEMISTRY
Unit 12: Coordination Compounds
The geometry and magnetic behaviour of the complex [Ni(CO)4] are
↻ Repeated question — also appeared in
2018 (16 sets)
- A. square planar geometry and paramagnetic
- B. square planar geometry and diamagnetic
- C. tetrahedral geometry and paramagnetic
- D. tetrahedral geometry and diamagnetic
Correct answer & explanation hidden
Log in to view solution →
Q144
CHEMISTRY
Unit 12: Coordination Compounds
The type of isomerism shown by the complex [CoCl2(en)2] is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Ionization isomerism
- B. Geometrical isomerism
- C. Linkage isomerism
- D. Coordination isomerism
Correct answer & explanation hidden
Log in to view solution →
Q144
CHEMISTRY
Unit 12: Coordination Compounds
The type of isomerism shown by the complex [CoCl2(en)2] is
↻ Repeated question — also appeared in
2018 (16 sets)
- A. Ionization isomerism
- B. Geometrical isomerism
- C. Linkage isomerism
- D. Coordination isomerism
Correct answer & explanation hidden
Log in to view solution →
Q145
CHEMISTRY
Unit 19: Biomolecules
The difference between amylose and amylopectin is
↻ Repeated question — also appeared in
2018 (14 sets)
- A. Amylopectin have 1 -> 4 alpha-linkage and 1 -> 6 beta-linkage
- B. Amylopectin have 1 -> 4 alpha-linkage and 1 -> 6 alpha-linkage
- C. Amylose is made up of glucose and galactose
- D. Amylose have 1 -> 4 alpha-linkage and 1 -> 6 beta-linkage
Correct answer & explanation hidden
Log in to view solution →
Q146
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
Regarding cross-linked or network polymers, which of the following statements is incorrect?
↻ Repeated question — also appeared in
2018 (7 sets)
- A. Examples are bakelite and melamine.
- B. They contain covalent bonds between various linear polymer chains.
- C. They contain strong covalent bonds in their polymer chains.
- D. They are formed from bi- and tri-functional monomers.
Correct answer & explanation hidden
Log in to view solution →
Q147
CHEMISTRY
Unit 18: Organic Compounds Containing Nitrogen
Nitration of aniline in strong acidic medium also gives m-nitroaniline because
↻ Repeated question — also appeared in
2018 (12 sets)
- A. In absence of substituents nitro group always goes to m-position.
- B. In spite of substituents nitro group always goes to only m-position.
- C. In acidic (strong) medium aniline is present as anilinium ion.
- D. In electrophilic substitution reactions amino group is meta directive.
Correct answer & explanation hidden
Log in to view solution →
Q148
CHEMISTRY
Unit 9: Classification of Elements and Periodicity in Properties
Which of the following oxides is most acidic in nature?
↻ Repeated question — also appeared in
2018 (8 sets)
- A. BaO
- B. MgO
- C. CaO
- D. BeO
Correct answer & explanation hidden
Log in to view solution →
Q149
CHEMISTRY
Unit 1: Some Basic Concepts in Chemistry
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
↻ Repeated question — also appeared in
2018 (2 sets)
- A. 2.8
- B. 1.4
- C. 4.4
- D. 3.0
Correct answer & explanation hidden
Log in to view solution →
Q150
CHEMISTRY
Unit 15: Hydrocarbons
Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is
↻ Repeated question — also appeared in
2018 (15 sets)
- A. CH3 – CH3
- B. CH ≡ CH
- C. CH4
- D. CH2 = CH2
Correct answer & explanation hidden
Log in to view solution →
Q153
CHEMISTRY
Unit 17: Organic Compounds Containing Oxygen
The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order
↻ Repeated question — also appeared in
2018 (13 sets)
- A. C2H5Cl, C2H6, C2H5OH
- B. C2H5OH, C2H6, C2H5Cl
- C. C2H5OH, C2H5ONa, C2H5Cl
- D. C2H5OH, C2H5Cl, C2H5ONa
Correct answer & explanation hidden
Log in to view solution →
Q155
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
Which of the following is correct with respect to – I effect of the substituents? (R = alkyl)
↻ Repeated question — also appeared in
2018 (13 sets)
- A. – NH2 > – OR > – F
- B. – NH2 < – OR < – F
- C. – NR2 > – OR > – F
- D. – NR2 < – OR < – F
Correct answer & explanation hidden
Log in to view solution →
Q156
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms?
↻ Repeated question — also appeared in
2018 (11 sets)
- A. CH2 = CH – CH = CH2
- B. HC ≡ C – C ≡ CH
- C. CH3 – CH = CH – CH3
- D. CH2 = CH – C ≡ CH
Correct answer & explanation hidden
Log in to view solution →
Q157
CHEMISTRY
Unit 17: Organic Compounds Containing Oxygen
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their
↻ Repeated question — also appeared in
2018 (14 sets)
- A. more extensive association of carboxylic acid via van der Waals force of attraction
- B. formation of intramolecular H-bonding
- C. formation of intermolecular H-bonding
- D. formation of carboxylate ion
Correct answer & explanation hidden
Log in to view solution →
Q157
CHEMISTRY
Unit 17: Organic Compounds Containing Oxygen
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their:
↻ Repeated question — also appeared in
2018 (14 sets)
- A. more extensive association of carboxylic acid via van der Waals force of attraction
- B. formation of intramolecular H-bonding
- C. formation of intermolecular H-bonding
- D. formation of carboxylate ion
Correct answer & explanation hidden
Log in to view solution →
Q159
CHEMISTRY
Unit 16: Organic Compounds Containing Halogens
In the reaction the electrophile involved is
↻ Repeated question — also appeared in
2018 (1 set)
- A. dichloromethyl anion
- B. dichloromethyl cation
- C. dichlorocarbene (:CCl2)
- D. formyl cation
Correct answer & explanation hidden
Log in to view solution →
Q159
CHEMISTRY
Unit 14: Some Basic Principles of Organic Chemistry
In the Reimer-Tiemann reaction, the electrophile involved is:
↻ Repeated question — also appeared in
2018 (1 set)
- A. dichloromethyl anion
- B. dichloromethyl cation
- C. dichlorocarbene (:CCl2)
- D. formyl cation
Correct answer & explanation hidden
Log in to view solution →
Q161
CHEMISTRY
Unit 19: Biomolecules
Which of the following compounds can form a zwitterion?
↻ Repeated question — also appeared in
2018 (10 sets)
- A. Benzoic acid
- B. Aniline
- C. Glycine
- D. Acetanilide
Correct answer & explanation hidden
Log in to view solution →
Q161
CHEMISTRY
Unit 19: Biomolecules
Which of the following compounds can form a zwitterion?
↻ Repeated question — also appeared in
2018 (10 sets)
- A. Benzoic acid
- B. Aniline
- C. Glycine
- D. Acetanilide
Correct answer & explanation hidden
Log in to view solution →
Q162
CHEMISTRY
Unit 9: Classification of Elements and Periodicity in Properties
The correct order of atomic radii in group 13 elements is:
↻ Repeated question — also appeared in
2018 (12 sets)
- A. B < Ga < Al < Tl < In
- B. B < Al < In < Ga < Tl
- C. B < Ga < Al < In < Tl
- D. B < Al < Ga < In < Tl
Correct answer & explanation hidden
Log in to view solution →
Q163
CHEMISTRY
Unit 10: p-Block Elements
Which one of the following elements is unable to form [MF6]3- ion?
↻ Repeated question — also appeared in
2018 (14 sets)
- A. B
- B. Ga
- C. In
- D. Al
Correct answer & explanation hidden
Log in to view solution →
Q164
CHEMISTRY
Unit 10: p-Block Elements
The correct order of N-compounds in its decreasing order of oxidation states is:
↻ Repeated question — also appeared in
2018 (10 sets)
- A. HNO3, NH4Cl, NO, N2
- B. HNO3, NO, N2, NH4Cl
- C. NH4Cl, N2, NO, HNO3
- D. HNO3, NO, NH4Cl, N2
Correct answer & explanation hidden
Log in to view solution →
Q165
CHEMISTRY
Unit 10: p-Block Elements
Which of the following statements is not true for halogens?
↻ Repeated question — also appeared in
2018 (15 sets)
- A. All but fluorine show positive oxidation states.
- B. All form monobasic oxyacids.
- C. Chlorine has the highest electron-gain enthalpy.
- D. All are oxidizing agents.
Correct answer & explanation hidden
Log in to view solution →
Q166
CHEMISTRY
Unit 3: Chemical Bonding and Molecular Structure
In the structure of ClF3, the number of lone pairs of electrons on central atom 'Cl' is:
↻ Repeated question — also appeared in
2018 (13 sets)
- A. four
- B. one
- C. three
- D. two
Correct answer & explanation hidden
Log in to view solution →
Q170
PHYSICS
Unit 9: Kinetic Theory of Gases
The correction factor 'a' to the ideal gas equation corresponds to:
↻ Repeated question — also appeared in
2018 (10 sets)
- A. electric field present between the gas molecules
- B. density of the gas molecules
- C. forces of attraction between the gas molecules
- D. volume of the gas molecules
Correct answer & explanation hidden
Log in to view solution →
Q172
CHEMISTRY
Unit 8: Chemical Kinetics
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction:
↻ Repeated question — also appeared in
2018 (15 sets)
- A. is tripled
- B. is halved
- C. remains unchanged
- D. is doubled
Correct answer & explanation hidden
Log in to view solution →
Q173
PHYSICS
Unit 9: Kinetic Theory of Gases
Given van der Waals constant for NH3, H2, O2 and CO2 are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied?
↻ Repeated question — also appeared in
2018 (9 sets)
- A. O2
- B. NH3
- C. CO2
- D. H2
Correct answer & explanation hidden
Log in to view solution →
Q175
PHYSICS
Unit 7: Properties of Solids and Liquids
On which of the following properties does the coagulating power of an ion depend?
↻ Repeated question — also appeared in
2018 (4 sets)
- A. Both magnitude and sign of the charge on the ion
- B. The magnitude of the charge on the ion alone
- C. The sign of charge on the ion alone
- D. Size of the ion alone
Correct answer & explanation hidden
Log in to view solution →
Q175
PHYSICS
Unit 7: Properties of Solids and Liquids
On which of the following properties does the coagulating power of an ion depend?
↻ Repeated question — also appeared in
2018 (4 sets)
- A. Both magnitude and sign of the charge on the ion
- B. The magnitude of the charge on the ion alone
- C. The sign of charge on the ion alone
- D. Size of the ion alone
Correct answer & explanation hidden
Log in to view solution →
Q176
CHEMISTRY
Unit 6: Equilibrium
The solubility of BaSO4 in water is 2.42 x 10^-3 gL^-1 at 298 K. The value of its solubility product (Ksp) will be (Given molar mass of BaSO4 = 233 g mol^-1)
↻ Repeated question — also appeared in
2018 (13 sets)
- A. 1.08 x 10^-14 mol^2 L^-2
- B. 1.08 x 10^-10 mol^2 L^-2
- C. 1.08 x 10^-8 mol^2 L^-2
- D. 1.08 x 10^-12 mol^2 L^-2
Correct answer & explanation hidden
Log in to view solution →
Q177
CHEMISTRY
Unit 3: Chemical Bonding and Molecular Structure
Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s^2 2s^2 2p^3, the simplest formula for this compound is
↻ Repeated question — also appeared in
2018 (13 sets)
- A. Mg2X
- B. Mg2X3
- C. Mg3X2
- D. MgX2
Correct answer & explanation hidden
Log in to view solution →
Q178
PHYSICS
Unit 7: Properties of Solids and Liquids
Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is
↻ Repeated question — also appeared in
2018 (8 sets)
- A. 24/33
- B. 2/3
- C. 2/1
- D. 23/34
Correct answer & explanation hidden
Log in to view solution →
Q180
CHEMISTRY
Unit 3: Chemical Bonding and Molecular Structure
Consider the following species: CN+, CN-, NO and CN. Which one of these will have the highest bond order?
↻ Repeated question — also appeared in
2018 (13 sets)
- A. CN+
- B. NO
- C. CN
- D. CN-
Correct answer & explanation hidden
Log in to view solution →