Question # 1

A paratooper moves downward with

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Zero acceleration

Constant acceleration

Positive acceleration

Negative acceleration

A ball is thrown up vertically, it takes 3 sec to reach maximum height. Its initial velocity is.

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10 ms-1

12.2 ms-1

15 ms-1

29.4 ms-1

A communication satellite is used ot reflect the signal of.

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Microwaves

Radio waves

y rays

x -rays

Increase in the velocity of sound in air for 1 ^oC rise in temperature is.

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61 ms-1

0.61 ms-1

161 ms-1

261 ms-1

An elevator is moving up with an acceleration equal to 'g' An apparent weight of the body in an elevator is.

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Zero

Equal to real weight

2 mg

3 mg

The drag force increases as the speed of object

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Become zero

Decreases

Increases

Remains constant

Which of the following is not directed along the fixed axis of rotation.

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Angular displacement

Angular momentum

Centripetal acceleration

Angular acceleration

A heat engine operates between the temperature 1000 K and 400 K, Its efficiency is.

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100%

70%

60%

50%

If velocity time graph is parallel to time axis, then acceleration of moving body will be.

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Maximum

Positive

Zero

Negative

The centre of Newton's rings will be

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Dark

Bright

Coloured

Not visible

Kilo watt hour is the unit of

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Power

Energy

Force

Torque

The time rate of change of momentum equals

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Weight

Applied force

Impulse

Mass

Crests and trough are formed in.

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Longitudinal waves

transverse waves

Stationary waves

Compression waves

For 0.0036 no. of significnat digits

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1

3

2

4

The area between velocity time graph and the time axis is numerically equal to.

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?Speed of object

Distance covered by the object

Average velocity of the object

Acceleration of the object.

In sonar we use

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Sound waves

Ultrasound waves

Microwaves

Radio waves

The K.E. of bullet of mass 500 gm moving at a speed of 200 ms-1

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250 J

125 J

2500 J

10,000 J

If a mass of a body is doubled, then acceleration becomes.

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Double

Half

One fourth

Constant

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