Question # 1

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

A typical rocket ejects the burnt gases at speeds over

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400 ms^-1

40000m s^-1

40000 ms^-1

60000 ms^-1

Two bodies of masses 1 kg and 5 kg are dropped gently form the top of a tower. A a point 20 cm from the ground both the bodies will have the same

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Momentum

Kinetic energy

Velocity

Total energy

When body moves with increasing acceleration, its velocity time graph is a

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straight line

horizontal straight line

vertical straight line

curve

Acceleration produced in a body by the force varies

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inversely as the applied force

directly as the applied force

directly as the mass of the body

none of them

A projectile on its path gets divided into two pieces at its highest point. Which is true?

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Momentum increases

Momentum decreases

Kinetic energy increases

Kinetic energy decreases

Rate of change of momentum is called

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Impulse

Force

Torque

Momentum

The projectile motion is composed of

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horizontal motion only

vertical motion only

horizontal and vertical motion

none of them

A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?

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0.1 m/s

10 m/s

1 m/s

0.01 m/s

If m means mass of gases objected per second from a rocket and v shows the change in velocity, than mv is named as:

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Force

Energy

work

impulse

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

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30°

45°

60°

75°

If the instantaneous velocity of a body does not change. the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable breaks and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upward

The consumption of energy by a 1000 watt heter in half an hour is:

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5 Kwh

0.5 Kwh

2.5 Kwh

3.2 Kwh

A ball is dropped from a height of 4.2 meters. To what height will take it rise if there is no loss of KE after rebounding?

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4.2 m

8.4 m

12.6 m

none of these

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

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