Q1
mcq
1 mark
The wavelength λe of an electron and λp of a photon of same energy E are related by :
- A. p e 1 λ ∝ λ
- B. λp ∝ λe
- C. 2 p e λ ∝ λ
- D. ep λ ∝ λ
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Q2
mcq
1 mark
Two polaroids are kept with their transmission axes inclined at 30°. Unpolarised light of intensity I falls on the first polaroid. Intensity of light emerging from the second polaroid :
- A. 1/8 I
- B. 1/4 I
- C. 3/8 I
- D. 3/4 I
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Q3
mcq
1 mark
If the magnitude of the magnetic field is 3×10^{-6} T, then the magnitude of the electric field for a electromagnetic wave is :
- A. 600 Vm^{-1}
- B. 100 Vm^{-1}
- C. 900 Vm^{-1}
- D. 300 Vm^{-1}
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Q4
mcq
1 mark
There is a current of 1.0 A in the circuit shown below. What is the resistance of P ?
- A. 3.5 Ω
- B. 1.5 Ω
- C. 4.5 Ω
- D. 2.5 Ω
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Q5
mcq
1 mark
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 :
- A. Violet - Yellow - Orange - Silver
- B. Yellow - Green - Violet - Gold
- C. Green - Orange - Violet - Gold
- D. Yellow - Violet - Orange - Silver
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Q6
mcq
1 mark
In an hydrogen atom, the electron revolving in the second orbit, has angular momentum :
- A. 4h/π
- B. h
- C. 2h/π
- D. h/π
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Q7
mcq
1 mark
In 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. 2D
- B. 2D
- C. D/2
- D. D/2
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Q8
mcq
1 mark
A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and distance between the plates are each doubled then which is the quantity that will change ?
- A. Voltage
- B. Capacitance
- C. Energy density
- D. Charge
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Q9
mcq
1 mark
An electromagnetic wave is propagating in a medium with velocity ∧→ =v v i. The instantaneous oscillating electric field of this electromagnetic wave is along 1Y axis, then the direction of oscillating magnetic field of the electromagnetic wave will be along :
- A. 1Z direction
- B. -Y direction
- C. -Z direction
- D. -X direction
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Q10
mcq
1 mark
For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is :
- A. 608
- B. 308
- C. 908
- D. 458
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Q11
mcq
1 mark
The Zener diode is primarily used as :
- A. Oscillator
- B. Rectifier
- C. Voltage regulator
- D. Amplifier
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Q12
mcq
e between the plates are each doubled then which is the quantity that will change ?
- A. Voltage
- B. Capacitance
- C. Energy density
- D. Charge
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Q12
mcq
The flux linked with a coil at any instant t is given by $\Phi_B = 15t^2 - 50t + 1250$. The induced emf at t=3 s is :
- A. −40 V
- B. −190 V
- C. 40 V
- D. −10 V
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Q13
mcq
An example of Diamagnetic material is _________.
- A. Nickel
- B. Water
- C. Aluminium
- D. Iron
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Q14
mcq
What is value of Forbidden Energy gap for silicon at room temperature ?
- A. 0.3 eV
- B. 0.7 eV
- C. 0.9 eV
- D. 1.1 eV
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Q15
mcq
The alloys used for muscle wires in Robots are :
- A. Gold silver alloys
- B. Shape memory alloys
- C. Two dimensional alloys
- D. Gold copper alloys
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Q19
short answer
Explain the reason for the glittering of diamond.
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Q20
short answer
The ratio of intensities of two waves in an interference pattern is 36 : 1. What is the ratio of the amplitudes of the two interfering waves ?
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Q21
short answer
Define work function of a metal. Give its unit.
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Q22
short answer
What is meant by activity or decay rate ? Give its unit.
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Q23
short answer
Draw the circuit diagram of a full wave rectifier.
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Q24
short answer
If the resistance of coil is 3 $\Omega$ at $20^{\circ}C$ and $\alpha=0.004/^{\circ}C$ then, determine its resistance at $100^{\circ}C$.
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Q25
long answer
Derive an expression for electrostatic potential due to a point charge.
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Q26
short answer
State Kirchhoff’s First and Second Rules.
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Q27
long answer
Explain the conversion of galvanometer into an ammeter.
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Q28
short answer
How will you induce an emf by changing the area enclosed by the coil ?
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Q29
short answer
What are Fraunhofer lines ? How are they useful in the identification of elements present in the Sun ?
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Q30
short answer
The given circuit has two ideal diodes connected as shown in figure below. Calculate the current flowing through the resistance $R_1$.
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Q31
short answer
What is optical path ? Write down the equation for optical path and mention what each term represents.
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Q32
short answer
Write any three Laws of Photoelectric Effect.
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Q33
short answer
Calculate the amount of energy released in joules when 1 kg of $^{235}_{92}U$ undergoes fission reaction.
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Q37
long answer
(i)State Coulomb’s Law in electrostatics. (ii)State the differences between Coulomb force and Gravitational force.
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Q38
long answer
Describe the Fizeau’s method to determine the speed of light.
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Q39
long answer
Discuss the working of Cyclotron in detail.
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Q40
long answer
Discuss the diffraction at single slit and obtain the condition for $n^{th}$ minimum.
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Q41
long answer
Derive an expression for phase angle between the applied voltage and current in a series RLC circuit.
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Q42
long answer
Describe Davisson-Germer experiment which demonstrated the wave nature of the electrons.
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Q43
long answer
Describe the microscopic model of current and obtain microscopic form of Ohm’s Law.
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Q44
long answer
Derive an expression for Radius and Velocity of an electron in the $n^{th}$ orbit using Bohr atom model.
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Q45
long answer
(i)Write down the properties of electromagnetic waves. (ii)The relative magnetic permeability of the medium is 2.5 and the relative electrical permittivity of the medium is 2.25. Compute the refractive index of the medium.
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Q46
long answer
Describe the function of a transistor as an amplifier with the neat circuit diagram. Sketch the input and output waveforms.
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