Question # 1

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non-ideal fluid

Prefect fluid

All

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

The expression F x t is called impulse if the time 't' is

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zero

very large

very small

infinite

Average KE of a gas molecule has:

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Direct relation with absolute temperature and inverse relation with pressure

Direction relation with both absolute temperature and pressure

Inverse relation with both absolute temperature and pressure

None of these

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

When the particles of the medium vibrate about their mean position, along the direction of the motion of waves, then the waves are called:

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Longitudinal waves

Transverse waves

Water waves

Complex waves

Rice takes longest to cook

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In a submarine 100 m below the surface of the sea

At sea level

At Murree

At Mount Everest

In the same medium, velocity of the wave:

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Goes on increasing

Remains constant

Goes on decreasing

None of these

The rectangular components of a vector are equal in magnitude when the vector makes and angle _______with their x-component:

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0°

30°

45°

60°

From the theory of relativity, momentum p of the photon is related to energy as

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p = hfc

p = hf/c

p = f(hc,f)

p = cf/h

A person moves 30m north then 20m east then 30√2 m south west His displacement from the original position is

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14 m south west

28 m south

10 m west

15 m east

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

A bullet of mass 10 g hits a target and penetrates 2 cm into it.If the average friction offered by the target is 100 N,then the velocity with which the bullet hits the target is

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10 ms^-1

1052 ms^-1

20 ms^-1

20√2 ms^-1

Time of flight of a body in projectile is the time in which a body

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Remains in the air

It reaches maximum height

The velocity becomes zero

None of these

Pick out the wrong pair:

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Charge-coulomb

Temperature-thermometer

Pressure-barometer

sp.gravity-hygrometer

Electromagnetic waves from a source were found to be significantly diffracted when passing through gaps of the order of 10 m. What type of waves are they likely to be?

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gamma waves

light waves

microwaves

radiowaves

Pico is the prefix for

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10^-10

10^-12

10^-15

10^-18

If plane polarized light is incident on the second sheet of Polaroid, the light emitted is full light when their axes are

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Parallel to each other

Perpendicular to each other

In between two positions

None of these

Diffraction is concerned with the superposition of

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very large number of secondary wavelets

a few secondary wavelets

two secondary wavelets

no secondary

If 'd' is the total displacement of the body in time 't' then the velocity during this interval t is

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Initial velocity

Variable velocity

Average velocity

None of these

A constant volume gas thermometer works on

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Charles' law

Boyle's law

Pascal's law

None of these

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