Question # 1

If the wave motion is 0.01 sec and wave speed is 100 ms-1 then frequency of wave is.

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0.5 Hz

1 Hz

10 Hz

100 Hz

The angular acceleration a =

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The slope of velocity time graph shows

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Total distance covered

Average acceleration

Instantaneous acceleration

Torque

If the slope of a velocity time graph gradually decreases than body is said to be moving with

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Positive acceleration

Negative acceleration

Uniform velocity

None

Before the launch of a rocket the mass of fuel of the rocket is approximately consists of.

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60%

50%

80%

100%

For angular momentum of system to remain constant, external torque should be.

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Small

Large

Zero

None

If a stretched string 4 m long and it has 4 loops of stationary waves, then the wave length is.

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1m

2 m

3 m

4 m

The distance between the consecutive nodes is

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One radian is equal to.

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75.3^o

57.3^o

35.7^o

73.3^o

In blue light is used as compare to red light then fringe spacing.

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Increase

Decreases

Remain same

Becomes zero

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

Efficiency of a heat engine working between 27 ^oC and 32 ^oC will be.

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50%

90%

40%

62%

the distance covered during one vibration of an oscillating body in terms of amplitude 'A' is

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A/2

A

2A

4A

Time taken by light to reach from sun to earth is.

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8 min 20 sec

7 min 20 sec

9 min 20 sec

None of these

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Wavelength of a wave for closed pipe having length 'l' in the fundamental mode is.

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2 l

1/2

4 l

l

Work has dimension lime

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Torque

Momentum

Velocity

Power

An object of mass 1 kg moving with acceleration 0 1 ms-2 will experience a force of.

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10^-2 N

10^-3 N

1 N

1 dyne

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