Question # 1

The three equation of motions are useful only for

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linear motion with increasing acceleration

line motion with uniform acceleration

linear motion with zero acceleration

linear motion with varying acceleration

If the objects of different masses move with the same velocity, then it is more difficult to stop the

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lighter of the two

massive of the two

any one of them

both of them

The displacement coincides with the path of the motion when a body moves is a

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curved line

straight line

may be curved or straight

none of them

The projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

Work done along a closed path in a gravitational force is:

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maximum

Minimum

Zero

Unity

A man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain drops are falling vertically down. To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west to east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

If the velocity time graph is a straight line parallel to the time-axis, then it means:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of these

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

A body is moving with constant velocity of 10 m/sec in the north-east direction. Then its acceleration will be:

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10 m/sec²

20 m/sec²

30 m/sec²

Zero

If an iron ball and a wooden ball of the same radius was released from a height 'h' in vacuum, then time taken by both of them to reach ground will be

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Unequal

Exactly equal

Roughly equal

Zero

A body of mass 5 kg is acted upon by a constant force of 20 n for 7 seconds. The total change in momentum will be:

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10 NS

100 NS

140 NS

200 NS

Rate of change of momentum is called

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Impulse

Force

Torque

Momentum

A body of weight 1 N has a kinetic energy of 1 joule when its speed is:

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1.46 m sec^-1

2.44 m sec^-1

3.42 m sec^-1

4.43 m sec^-1

The decrease in velocity per unit time is called:

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Variable Acceleration

Average Acceleration

Retardation

None of these

The expression F x t is called impulse if the time 't' is

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zero

very large

very small

infinite

In velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is

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8

4

6

7

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