Question # 1

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

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pair production

photoelectric effect

Compton effect

None of these

Longitudinal waves are also called:

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Congressional waves

Transverse waves

Radio waves

None of them

In the study of thermodynamics, which gas is considered as the working substance

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real gas

ideal gas

any gas may be ideal or real

none of them

If the length of the conductor is double and its cross sectional area is halved, its conductance will

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Increase four fold

Become one-fourth

Become one-half

Remains unchanged

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

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deuterium

protium

tritium

none of these

Origin of the electric and the gravitational forces

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Was known in 1911 A.D.

Was known in 1811 A.D.

Was known in 1711 A.D.

is still unknown

Was known in 1611 A.D.

When a body is vibrating, the displacement from mean position:

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Increases with time

Decreases with time

Changes with time

None of these

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

At resonance frequency the impedance of parallel resonance circuit is

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Maximum

Minimum

Zero

None of the above

Electromagnetic -radiation means:

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Photons

protons

Electrons

Mesons

None of these

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

A body is moving with a uniform speed along a straight line.Its angular momentum with respect to a fixed point away from the line

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Increases as the body moves away from the point

Decreases as the body moves away from the point

Is zero

Is constant and does not depend on the position of the body

Equal charges are given to two spheres of different radii,The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both the sphere

Depend on the nature of the material of the sphere

The rotational analogue of power is given by

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τω

τv

F ω

τ/ω

The critical temperature Tc for Aluminium is

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2.1 K

1.1 K

1.18 K

1.19 K

SI unit of water equivalent of electrons is

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Kg

Kg²

Kg³

Kg¹

Bending of light around sharp edges is known as

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Interference

Diffraction

Reflection

Dispersion

A body of mass 'm' is moved to a height 'h' equal to the radius of the earth.The increase in potential energy is

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2 mgR

mgR

1/2 mgR

1/4 mgR

In young s interference experiment one slit is covered with a cellophane paper which absorbs half the intensity then

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No fringes are observed

All fringes will be darks

bright fringes will be less bright and dark will be less dark

Bright fringes will be brighter and dark fringes will be darks

When the car moves with constant accelerations, the velocity time graph is a

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Straight line

Straight line rises equally

Horizontal straight line

None of these

A collision in which the K.E. is not conserved is called

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Elastic collision

Inelastic collision

Both

None of these

The electrical conductivities of insulators are ranging from

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10^-5to 10^-10(Ω m)^-1

10^-10to 10^-15(Ω m)^-1

10^-5to 10^-15(Ω m)^-1

10^-10to 10^-20(Ω m)^-1

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