Question # 1

A bullet is shot from a rifle. As a result the rifle recoils. The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

In an L-R circuit, time constant is that time in which current grows from zero to the value

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0.63 I_o

0.50 I_o

0.37 I_o

I_o

A moving charge will gain energy due to the application of

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Electric field

Magnetic field

Both of these

None of these

Which of the modulus of elasticity is involved in compression a rod to decrease its length?

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Young's modulus

Bulk modulus

Modulus of rigidity

None of the above

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

The length of a telescope is 36 cm. The focal lengths of its lenses can be

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30 cm, 6 cm

-30 cm, -6 cm

30 cm, -6cm

-30cm, 6cm

In a common base transistor circuit, the current gain is 0.98. On changing the emitter current by 5.00 mA, the change in collector current is

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0.916 mA

2.45 mA

4.9 mA

5.1 mA

A prism splits a beam of white light into its seven constituent colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

A sun rise or sun set, the sun looks reddish because:

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

A monochromatic source of light is placed at a large distance d from a metal surface. Photoelectrons are ejected at rate n, kinetic energy being E. If the source is brought nearer to distance d/2, the rate and kinetic energy per photoelectron become nearly

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2n and 2E

4n and 4E

4n and E

N and 4E

The direction of induced current is such that it opposes the very cause that has produced it. This is the law of

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Lenz

Faraday

Kirchoff

Fleming

In a simple harmonic motion the kinetic energy (KE) and the potential energy (PE), are such that throughout the motion

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KE remains constant

PE remains constant

KE/PE is constant

KE+PE remains constant

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by monochromatic blue light of the same intensity

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Fringe width will decrease

Fringe width will increase

The fringe width will remain unchanged

Fringes will becomes less intense

If the period of oscillation of mass (M) suspended from a spring is 2s, then the period of mass 4M will be

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1 s

2 s

3 s

4 s

When light wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however, light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters?

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1 : 2

2 : 1

4 : 1

1 : 4

A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen

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Half the image will disappear

No change either in size or in intensity

Intensity of image will increase

Intensity of the image will decrease

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