Question # 1

One complete round trip of a body is called

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Displacement

Time period

Vibration

Frequency

When newton ring are seen through the transmitted light, then central spot is.

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Dark

Blue

Bright

Red

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

In transverse waves the particles of medium vibrate

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Along the direction of wave

Opposite to direction of wave

Perpendicular to direction of wave

Slowly

Michelson's interferometer can be used ot find the

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Velocity of light

Wavelength of light

Velocity of sound

Wavelength of sound

The commercial unit of electric energy is

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Kilo watt hour

watt

Watt hour

Kilo Watt

The blue colour of sky is due to

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diffraction

Reflection

Polarization

Scattering

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

The orbital angular momentum is associated with the motion of a body along

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Straight path

Circular path

Curved path

Along any path

Unit of acceleration is

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ms-1

ms

ms-2

m2s

A force of 20 N acts along x axis, tis component is.

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0 N

10 N

20 N

30 N

The frequency of 2nd pendulum is

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0.5 Hz

1 Hz

1.5 Hz

2 Hz

A collision in which K.E. of the system is not conserved is

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Elastic collision

Inelastic collision

3rd low of motion

None of these

Head to tail rule is used for

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Addition of vectors

Subtraction of vectors

Multiplication of vectors

Division of vectors

An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at.

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0 K

0 ^oC

100 K

100 ^oC

If the slope of the velocity time graph remain constant then body is moving with.

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Uniform velocity

Negative variable acceleration

Variable acceleration

Uniform acceleration

The equations of motion hold good for

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Variable acceleration

Uniform acceleration

Centripetal acceleration

All of these

Total change in momentum of an isolated system is

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Always (+) ve

Always (-) ve

Has maximum value

Zero

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