Question # 1

The dimensional unit of impulse is.

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[MLT]

[MLT-1]

[ML-1T-1]

[M-1L-1T-1]

The relation between the speed and hoop can be written as

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2

4

1/2

1/4

The work done will be maximum when angle between F and d.

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180^o

0^o

90^o

60^o

The ratio of the velocities of wate in a pipe lying horizontally at two ends is 1 : 4 The ratio of diameters of pipe at these two ends is.

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1 : 2

2 : 1

1 : 4

4 : 1

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The acceleration produced by elastic restoring force is

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Perpendicular to force

Opposite to force

In same direction as force

Zero

Let A = Area of cross section of pipe, v = speed of fluid, then 'Av' is called.

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Volume flow rate

Energy flow rate

Mass flow rate

Pressure flow rate

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

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Small

Large

Zero

None

The frequency of 2nd pendulum is

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0.5 Hz

1 Hz

1.5 Hz

2 Hz

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

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25%

50%

70%

100%

A bat finding its correct location by sending

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Matter waves

Ultrasonic waves

Infrasonic waves

electromagnetic waves

The SI units of flow rate are.

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m2s-1

m3s-2

m3s-1

m2s-2

Stationary waves are generated on a string of high l, if tension is increased , frequency of vibration will

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Decrease

Unchanged

Half

Increases

The term in Bernoulli's equation has the same unit as

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Work

Volume

Pressure

Force

Two waves of same frequency and moving in the same direction produces.

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Interference

Diffraction

Beats

Stationary waves

The regular or steady flow of fluid is called

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Stream line

Turbulent flow

Average flow

None of these

The wavelength of X-rays is of the order of.

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10^-8 m

10^-10m

10^-5m

10^-4m

Damping is the process in which energy

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Increases

Remains constant

Dissipates

None of these

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