Q1
mcq
1 mark
Which charge configuration produces a uniform electric field ?
- A. Uniformly charged infinite plane
- B. Point charge
- C. Uniformly charged spherical shell
- D. Uniformly charged infinite line
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Q2
mcq
1 mark
The blueprint for making ultra durable synthetic material is mimicked from :
- A. Parrot fish
- B. Lotus leaf
- C. Peacock feather
- D. Morpho butterfly
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Q3
mcq
1 mark
In a transformer, the number of turns in the primary and the secondary are 410 and 1230 respectively. If the current in primary is 6 A, then that in the secondary coil is :
- A. 12 A
- B. 2 A
- C. 1 A
- D. 18 A
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Q4
mcq
1 mark
Which of the following is false for electromagnetic waves ?
- A. longitudinal
- B. transverse
- C. produced by accelerating charges
- D. non-mechanical waves
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Q5
mcq
1 mark
If the nuclear radius of $^{27}\text{Al}$ is 3.6 fermi, the approximate nuclear radius of $^{64}\text{Cu}$ in fermi is :
- A. 4.8
- B. 2.4
- C. 3.6
- D. 1.2
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Q6
mcq
1 mark
The unit of electric flux is :
- A. Nm$^{-1}$C$^{2}$
- B. Nm$^{-2}$C$^{-1}$
- C. Nm$^{2}$C$^{-1}$
- D. N$^{2}$mC$^{-1}$
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Q7
mcq
1 mark
In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is :
- A. Q/2
- B. Q/\sqrt{2}
- C. Q
- D. Q/3
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Q8
mcq
1 mark
The ratio of magnetic length and geometrical length is :
- A. 0.833
- B. 0.633
- C. 0.933
- D. 0.733
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Q9
mcq
1 mark
The Zener diode is primarily used as :
- A. Oscillator
- B. Rectifier
- C. Voltage regulator
- D. Amplifier
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Q10
mcq
1 mark
If the Velocity and Wavelength of light in air is $V_a$ and $\lambda_a$ and that in water is $V_w$ and $\lambda_w$, then the refractive index of water is :
- A. $\lambda_w/\lambda_a$
- B. V_w/V_a
- C. $(V_a \lambda_a) / (V_w \lambda_w)$
- D. V_a/V_w
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Q11
mcq
1 mark
For a healthy eye, the distance of the near point is __________.
- A. 30 cm
- B. 20 cm
- C. 35 cm
- D. 25 cm
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Q12
mcq
1 mark
The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 $\Omega$ is :
- A. 0.8 $\Omega$
- B. 0.2 $\Omega$
- C. 1.0 $\Omega$
- D. 0.5 $\Omega$
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Q13
mcq
1 mark
A particle having mass m and charge q accelerated through a potential difference V. Find the force experienced when it is kept under perpendicular magnetic field $\vec{B}$.
- A. $\frac{3}{2} q B \sqrt{\frac{2V}{m}}$
- B. $q B \sqrt{\frac{2qV}{m}}$
- C. $\frac{3}{3} q B \sqrt{\frac{2qV}{m}}$
- D. $\frac{3}{2} q B \sqrt{\frac{qV}{2m}}$
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Q14
mcq
1 mark
In a Young’s double slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to :
- A. 2 D
- B. 2 D (Note: typo in source, duplicate 2D)
- C. D/2
- D. D/2 (Note: typo in source, duplicate D/2)
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Q15
mcq
1 mark
Emission of electrons by the absorption of heat energy is called __________ emission.
- A. Thermionic
- B. Photoelectric
- C. Secondary
- D. Field
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Q16
short answer
2 marks
Mention the ways of producing induced emf.
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Q17
short answer
2 marks
Find the Polarizing angle for glass of refractive index 1.5.
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Q19
short answer
2 marks
Define “Electrostatic Potential”.
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Q20
short answer
2 marks
How will you define threshold frequency ?
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Q24
short answer
3 marks
Dielectric strength of air is 4×10$^{6}$ Vm$^{-1}$. Suppose the radius of a hollow sphere in the Van de Graaff generator is R=0.4 m, calculate the maximum potential difference created by this Van de Graaff generator.
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Q25
short answer
3 marks
State Kirchhoff’s current and voltage rule.
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Q26
short answer
3 marks
What are critical angle and total internal reflection ?
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Q27
short answer
3 marks
List out the characteristics of Photons.
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Q28
short answer
3 marks
Obtain the expression for energy stored in the parallel plate capacitor.
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Q29
short answer
3 marks
Mention the differences between interference and diffraction.
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Q30
short answer
3 marks
The repulsive force between two magnetic poles in air is 9×10$^{-3}$ N. If the two poles are equal in strength and are separated by a distance of 10 cm, calculate the pole strength of each pole.
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Q31
short answer
3 marks
Draw the circuit diagram of a full wave rectifier and draw its input and output waveforms.
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Q32
short answer
3 marks
Mention the various energy losses in a transformer.
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Q33
short answer
3 marks
$^{92}\text{U}^{235}$ nucleus emits 2$\alpha$ particles, 3$\beta$ particles and 2$\gamma$ particles. What is the resulting atomic number and mass number ?
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Q34
long answer
5 marks
(a) Deduce the relation for the magnetic field at a point due to an infinitely long straight conductor carrying current. OR (b) Obtain the law of radioactivity.
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Q35
long answer
5 marks
(a) Calculate the electric field due to a dipole on its axial line. OR (b) What is Frequency Modulation ? List out the advantages and limitations of frequency modulation.
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Q36
long answer
5 marks
(a) (i) Derive an expression for de Broglie wavelength of electrons. (ii) Calculate the momentum of an electron with kinetic energy 2 eV. OR (b) Write down Maxwell
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Q37
long answer
5 marks
(a)Explain about Astronomical telescope and obtain the equation for the magnification. OR (b)(i)Explain the equivalent resistance of a series resistor network. (ii)A Copper wire of cross-sectional area 0.5 $mm^2$ carries a current of 0.2 A. If the free electron density of copper is $8.4 \times 10^{28} m^{-3}$ then compute the drift velocity of free electrons.
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Q38
long answer
5 marks
(a)Obtain Lens maker’s formula. OR (b)Derive an expression for phase angle between the applied voltage and current in a series RLC circuit.
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Q39
long answer
(a) Explain about Astronomical telescope and obtain the equation for the magnification. OR (b) (i) Explain the equivalent resistance of a series resistor network. (ii) A Copper wire of cross-sectional area 0.5 mm$^{2}$ carries a current of ...
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Q40
short answer
n strength and are separated by a distance of 10 cm, calculate the pole strength of each pole.
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Q42
long answer
(a)Calculate the electric field due to a dipole on its axial line.
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Q43
long answer
(b)What is Frequency Modulation ? List out the advantages and limitations of frequency modulation.
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Q44
long answer
Derive an expression for de Broglie wavelength of electrons.
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Q45
long answer
Calculate the momentum of an electron with kinetic energy 2 eV.
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Q46
long answer
(b)Write down Maxwell equations in integral form.
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Q47
long answer
(a)Explain about Astronomical telescope and obtain the equation for the magnification.
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Q48
long answer
Explain the equivalent resistance of a series resistor network.
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Q49
long answer
A Copper wire of cross-sectional area 0.5 mm$^{2}$ carries a current of 0.2 A. If the free electron density of copper is $8.4 \times 10^{28}$ m$^{-3}$ then compute the drift velocity of free electrons.
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Q51
long answer
(b)Derive an expression for phase angle between the applied voltage and current in a series RLC circuit.
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