Question # 1

According to first law of thermodynamics the quantity which is conserved.

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Force

Momentum

Energy

Power

A force of 100 N makes on angle of 60^owith y axis, its horizontal component is.

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50 N

60 N

70.7 N

86.6 N

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

Sound waves can not be

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Reflected

Refracted

Polarized

Diffracted

The regular or steady flow of fluid is called

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Stream line

Turbulent flow

Average flow

None of these

Rate of change of displacement is called

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Speed

Velocity

Kinetic energy

None of these

The speed of sound in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

In stationary waves, the particle velocity at nodes is

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Minimum

Maximum

Zero

Constant

The temperature scale which is independent of nature of substance is.

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

Name the quantity which is a vector.

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Speed

Force

Temperature

Density

The mathematical expression for the restoring force is.

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F = kx

F = ma

F = dp/dt

F = -kx

Time period of simple pendulum depends upon

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Mass of pendulum

Weight of pendulum

Length of pendulum

Shape of pendulum

The process of confining the beam of light to vibrate in one plane is called.

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Interference

Diffraction

Polarization

Total internal refraction

A spring of spring constant 10 N/m after loading that amplitude is 2m. Then the maximum P.E. is

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10 J

20 J

30 J

40 J

The space within which gravitational force acts on a body is called

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Electric field

Gravitational field

Magnetic field

Force field

If the are of a circle equals its radius, then the angle subtended at the center will be

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1 degree

One rotation

One radian

Half rotation

With increase of temperature, speed of sound.

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Remains constant

Becomes zero

Decreases

Increases

In rotational motion the torque is equal to rate of change of

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Angular velocity

Linear momentum

Angular momentum

Angular acceleration

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