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Physics Class 9 - Important MCQs - 6

Physics Class 9 - Important MCQs - 6

1. Every body continues in its state of rest or of uniform motion in a straight line unless it is compelled to change that state by an external source impressed upon it.

1) Newton s First Law
2) law of conservation of Momentum
3) Law of inertia
4) Newton s third law
2. That agent which changes or tends to change the state of rest or of uniform motion of a body

1) ma
2) friction
3) Force
4) mass
3. Action and reaction are equal in magnitude but opposite in direction

1) Force
2) Newton s third law
3) Tension
4) weight
4. Kinetic friction

1) k Fn
2) kg ms-2
3) km h-1
4) Kg ms-1
5. Motion about a fixed point

1) Rotation of earth
2) Change in velocity
3) Gravitational acceleration
4) uniform acceleration
6. Weight

1) s Fn
2) mg
3) k Fn
4) mv
7. Average acceleration

1) Change in velocity
2) Gravitational acceleration
3) 160 km/h
4) uniform acceleration
8. The force acting along a string

1) Force
2) Tension
3) mass
4) weight
9. When two or more bodies collide with one another the total momentum of the system remains the same provided no external force acts upon them.

1) Tension
2) law of conservation of Momentum
3) Newton s third law
4) Law of inertia
10. The magnitude of acceleration produced when a force acts on it

1) mass
2) ma
3) friction
4) mg
11. Momentum

1) K m h-2
2) Kg ms-1
3) no unit
4) km h-1
12. Static friction

1) s Fn
2) k Fn
3) Kg ms-1
4) kg ms-2
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