CBSE Class 9 Science Force and Laws of Motion Quiz 2

1. When a car at high speed makes a sharp turn, the driver in a car tends to get thrown to the side opposite to the turn. This is due to the

A inertia of motion B inertia of time C inertia of rest D inertia of direction

2. A man is standing on a boat in still water. If he walks towards the shore, then the boat will

A move away from the shore B move towards the shore C remain stationary D none of these

3. Which of the following is an incorrect statement?

A Mass is measure of inertia of a body. B Newton’s first law of motion is the law of inertia. C Unbalanced force produces constant velocity. D Newton’s third law talks about the direction of the force.

4. A ball is thrown vertically upward in a train moving with uniform velocity. The ball will

A fall behind the thrower B fall ahead of the thrower C return back to the thrower D fall on the left of the thrower

5. Which of the following is not an application of conservation of linear momentum?

A While firing a bullet, the gun must be held tight to the shoulder B When a man jumps from a boat to the shore C A rocket explodes on midway from the ground D A body suspended from the hook of a spring balanced in a lift which is accelerated downward

6. When we stop pedalling, the bicycle begins to slow down. This is because of the

A Frictional force acting along the direction of motion of bicycle B Air resistance which is in the direction of motion C Frictional force acting opposite to the direction of motion of bicycle by the road D Nature of the bicycle to stop after some time

7. Inertia is the property of a body by virtue of which, it cannot change by itself

A its state of rest B its steady state of uniform motion C its direction of motion D all of these.

8. An athlete does not come to rest immediately after crossing the winning line due to the

A inertia of motion B inertia of rest C inertia of direction D none of these

9. A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet gets embedded in the wooden block, then the magnitude of velocity of the system just after the collision will be

A \(\frac{A+B}{AC}\) B \(\frac{A+C}{B+C}\) C \(\frac{AC}{B+C}\) D \(\frac{AB}{A+C}\)

10. The masses of two bodies are in ratio 5 : 6 and their velocities are in ratio 1 : 2. Then their linear momentum will be in the ratio

A 5 : 6 B 1 : 2 C 12 : 5 D 5 : 12