Q1. In which one of the following ways you can identify whether a force is acting on an object or not?
- Measure the instantaneous velocity of a moving object
- Determine its mass at different locations
- Note if there is any change in the state of motion of the object
- A and C
- Q2. Name the force acting on a book rested on the table top.
- Nuclear force
- Gravitational force
- Electrostatic force
- Magnetic force
- Q3. What is thee S.I. unit of momentum?
- kg ms-1
- kg m-1s
- kg ms-2
- kg m-2s
- Q4. 1 newton = _______ dyne
- 103
- 104
- 105
- 106
- Q5. A force of 10 N acts on a ball moving on a surface. The force of friction that must act between the surface of the ball and the surface so that the ball keeps on moving with constant velocity over the surface must be
- Zero
- 10 N
- 100 N
- 20 N
- Q6. In which of the following cases the forces acting on the object are balanced?
- A person resting on an armchair.
- A cyclist applying brakes to a moving cycle.
- A lorry travelling at a variable speed on a straight road.
- A car that has a deceleration of 10 m/s2.
- Q7. A 1 kg object is lying on the ground. An unbalanced force of magnitude 1 N is applied to the object. Which one of the following correctly explains the motion of the object as a result of the acting force?
- The object will remain at rest.
- The object will accelerate in a direction perpendicular to the applied force.
- The object will accelerate in the direction of the applied force.
- The object will decelerate in the direction of the applied force.
- Q8. The momentum of an isolated system remains conserved provided
- Net external force on the system is zero.
- Net external force of the system is non-zero.
- Net initial momentum of the system is zero.
- Net final momentum of the system is zero.
- Q9. The velocity of a body of mass 15 kg increases from 5 m/s to 10 m/s when a force acts on it for 2 s. What is the gain in momentum per second?
- 150 kg.m/s
- 100 kg.m/s
- 75 kg.m/s
- 50 kg.m/s
- Q10. Principle of conservation of momentum is the corollary of Newton's third law of motion.
- True
- False
- Q11. A man throws a ball weighing 200 g vertically upwards with a speed of 10m/s. What will be Its momentum at its highest point of flight?
- 2000 kg.m/s
- 2 kg. m/s
- Zero
- Insufficient data to find the momentum
- Q12. Unit of which physical quantity is the same as that of the unit of the impulse of force?
- Momentum
- Force
- Acceleration
- Velocity
- Q13. A/An ________ force does not exist.
- isolated
- electrostatic
- reaction
- action
- Q14. A gun of mass 5 kg fires a 50 g bullet with a velocity of 200 m/s, the recoil velocity of the gun is
- – 2 m/s
- 20 m/s
- 0.2 m/s
- Zero
- Q15. When balanced forces act on a body, the body is
- Either at rest or moving with constant velocity.
- Moving with variable speed.
- Moving with variable velocity.
- Accelerating.
- Q16. Newton's first law of motion states that the force on an object is directly proportional to the rate of change of momentum.
- True
- False
- Q17. When a force is exerted on an object, it can change its
- state
- position
- shape
- All the above
- Q18. What is the change in momentum when a car weighing 700 kg changes its speed from 100 m/s to 200 m/s?
- 70000 kg.m/s
- 14000 kg.m/s
- 21000000 kg.m/s
- 10500000 kg.m/s
- Q19. A resistive force of 16 N acts on a ball of mass 40 g continuously. If the initial velocity of the ball is 24 ms-1 then the time taken by it to come to rest will be
- 0.02 s
- 0.04 s
- 0.06 s
- 0.08 s
- Q20. Two objects each of mass 1.5 kg are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m/s before the collision during which they stick together. What will be the velocity of the combined object after the collision?
- 2.5 m/s
- Zero
- 2.5 m/s
- 5m/s2
- Q21. Quantitative expression of force is given by
- Newton's first law of motion
- Newton's second law of motion
- Newton's third law of motion
- Newton's law of gravitation
- Q22. If A and B are two bodies of masses 20 kg and 40 kg respectively, then
- A has more inertia than B.
- B has more inertia than A.
- A and B have same inertia.
- They will not have any inertia.
- Q23. If two or more forces act on an object and they do not change the state of rest or motion of the object, then such forces are called unbalanced forces.
- True
- False
- Q24. The tendency of a body to resist change in a state of rest or state of uniform motion is called ________ .
- Inertia
- Momentum
- Acceleration
- Impulse
- Q25. The motion of rocket is based on Newton’s third law of motion.
- True
- False
- Q26. While dusting a carpet we beat it with a stick because
- Inertia of motion removes the dust.
- Inertia of rest keeps the dust in its position.
- No inertia is involved.
- Force applied on the carpet.
- Q27. In a collision momentum is always conserved.
- True
- False
- Q28. What is the total momentum of the bullet and gun before firing a bullet of mass m and velocity v?
- mv
- 2mv
- mv/2
- zero
- Q29. The action and the reaction forces acting on two different bodies produce equal acceleration in the two bodies.
- True
- False
- Q30. Galileo's experiment can be explained by
- Newton's first law of motion
- Newton's second law of motion
- Newton's third law of motion
- Newton's gravitational law
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