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CBSE Notes 2011-2012 » IX-Science

# Force and Laws of Motion

## Impulse has the S.I. unit of ________.

Multiple choice question

Impulse has the S.I. unit of ________.

## A : Atheletes fall on a cushion in a high jump event to avoid getting hurt. B : Time to come to rest...

Multiple choice question

A : Atheletes fall on a cushion in a high jump event to avoid getting hurt.
B : Time to come to rest is increased to reduce the force.

## A : Force can change the direction and magnitude of the velocity. B : Acceleration may be acquired d...

Multiple choice question

A : Force can change the direction and magnitude of the velocity.
B : Acceleration may be acquired due to the reduction in the mass of the body under motion.
C : Two masses moving with the same velocity can be stopped in distances S1 and S2 (< S1) such that m1 > m2 with the same retarding force.

## A : The ratio of the S.I. to C.G.S. unit of forces is 105. B : Water evolving out of a hose exerts n...

Multiple choice question

A : The ratio of the S.I. to C.G.S. unit of forces is 105.
B : Water evolving out of a hose exerts no force on the pipe.

## A 20 kg gun fires a bullet of mass 20 g with a velocity of400 m/s. The action on the shoulder of the...

Multiple choice question

A 20 kg gun fires a bullet of mass 20 g with a velocity of400 m/s. The action on the shoulder of the person per second by the gun is

## The acceleration of a body has to be doubled without any change in force. Then one has to

Multiple choice question

The acceleration of a body has to be doubled without any change in force. Then one has to