(Set 1) Force and Law of Motion

Q1. 
The displacement-time (s-t) graph of a particle acted upon by a constant force is
  1. a straight line
  2. a circle
  3. a parabola
  4. any curve depending upon initial conditions

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Correct Answer : C

Q2. 
Which one of the following is not a contact force?
  1. Push force
  2. Gravitational force
  3. Frictional force
  4. Strain force

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Correct Answer : B

Q3. 
Which of the following quantity is a measure of inertia?
  1. Velocity
  2. Acceleration
  3. Mass
  4. Weight

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Correct Answer : C

Q4. 
The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called
  1. velocity
  2. force
  3. momentum
  4. inertia

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Correct Answer : D

Q5. 
Which one of the following has maximum inertia?
  1. An atom
  2. A molecule
  3. A one rupee coin
  4. A cricket ball

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Correct Answer : D

Q6. 
The know forces of nature can be divided into four classes, viz, gravity, electromagnetism, weak nuclear force and strong nuclear force, With reference to them, which one of the following statements is not correct?
  1. Gravity is the strongest of the four
  2. Electromagnetism acts only on particles with an electric charge
  3. Weak nuclear force causes radioactivity
  4. Strong nuclear force holds protons and neutrons inside the nucleus an atom

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Correct Answer : A

Q7. 
The inertia of an object tends to cause the object
  1. to increase its speed
  2. to decrease its speed
  3. to resist any change in its state motion
  4. to decelerate due to friction

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Correct Answer : C

Q8. 
When running car stops suddenly, the passengers tend to lean forward because of
  1. centrifugal force
  2. inertia of rest
  3. inertia of motion
  4. gravitational force

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Correct Answer : C

Q9. 
An athlete runs before long jump to get advantage on
  1. inertia of motion
  2. frictional force
  3. moment of a force
  4. principle of moments

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Correct Answer : A

Q10. 
A passenger falls in the direction when a moving bus applies brakes to stop and falls backwards when it accelerates from rest. This is because of
  1. force
  2. displacement
  3. inertia
  4. momentum

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Correct Answer : C

Q11. 
Newton's first law is also known as .........
  1. law of friction
  2. law of momentum
  3. law of inertia
  4. law of motion

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Correct Answer : C

Q12. 
Newton's lows of motion do not hold good for objects
  1. at rest
  2. moving slowly
  3. moving with high velocity
  4. moving with velocity comparable to velocity of light

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Correct Answer : D

Q13. 
A particle is moving with constant speed along a straight line path. A force is not required to
  1. increase its speed
  2. decrease the momentum
  3. change the direction
  4. keep it moving with uniform velocity

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Correct Answer : D

Q14. 
A batsman hits a cricket ball which than rools on a level ground. After covering a short distance, the ball cames to rest. The ball slews to a stop because
  1. the batsman did not hit the ball hard enough
  2. velocity is proportional to the force exerted on the ball
  3. There is a force on the ball opposing the motion
  4. There is no unbalanced force on the ball, so the ball would try to come to rest

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Correct Answer : C

Q15. 
Linear momentum is equal to
  1. mass x velocity
  2. speed x weight
  3. force x height
  4. mass x volume

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Correct Answer : A

Q16. 
When a ball bounces off the ground, which of the following changes suddenly? ( Assume no loss of energy to the floor)
  1. Its speed
  2. Its momentum
  3. Its kinetic energy
  4. Its potential energy

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Correct Answer : B

Q17. 
A body of mass 8 kg is moving with a velocity of 4 m/s. Find its momentum.
  1. 2
  2. 64
  3. 32
  4. 4

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Correct Answer : C

Q18. 
Two bodies A and B are moving with equal velocities. The mass of B is doubled that of A. In this context, which one of the following statements is correct?
  1. Momentum of B will be double that of A.
  2. Momentum of A will be double that of B.
  3. Momentum of B will be four times that of A.
  4. Momentum of both A and B will be equal.

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Correct Answer : A

Q19. 
On which one of the following conservation laws, does a rocket work?
  1. Mass
  2. Energy
  3. Linear momentum
  4. Angular momentum

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Correct Answer : C

Q20. 
A body lying at rest suddenly breaks into two parts of equal masses which start moving. The two parts will move in
  1. Opposite direction with equal speed
  2. same direction with equal speed
  3. any direction with unequal speed
  4. opposite direction with unequal speed

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Correct Answer : A

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