Question # 1

A certain force gives an acceleration of 2 m/sec2 to a body if mass 5 kg. The same force would give a 29 kg object an acceleration of:

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0.5 m/sec2

5 m/sec2

1.5 m/sec2

9.8 m/sec2

The product of force and time is called change in:

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Momentum

Impulse

Force

Both a and b

Acceleration produced in a body by a 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

When a body is moving on a surface, the force of friction is called

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Static friction

Dynamic friction

Limiting friction

Rolling friction

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

A cold soft drink is kept on the balance. When the cap is opened, then the weight

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Increases

Decreases

First increases, then decreases

Remains same

The mass of a body measured by a physical balance in a lift at rest is found to be m, if the lift is going up with an acceleration a, its mass will be measured as

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m (1 - a/g)

m (1 + a/g)

m

Zero

When the total displacement is divided by total time taken, we get:

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Velocity

Average speed

Average velocity

None of these

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

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Maximum

Minimum

Zero

Unity

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

Zero

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

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

When we consider the average velocity of a body, then the body is moving in

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straight line

curved path

may be in a straight or curved path

none of them

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

In equation F=ma, then mass 'm' is

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rest mass

variable mass

inertial mass

gravitational mass

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