(Set 2) Force and Law of Motion

Q1. 
A metal ball and and a rubber ball of the same mass are dropped from the same height. After hitting the floor, the rubber ball rises higher than the metal ball, why?
  1. Momentum is not conserved when the metallic ball hits the floor
  2. The rubber ball hits the floor with greater velocity
  3. Momentum is not conserved when rubber ball hits the floor
  4. None of the above

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Correct Answer : D

Q2. 
A shell of mass 0.04 kg is fired by a gun of mass 120 kg. If the muzzle speed of the shell is 90 m/s. What is the recoil speed of the gun?
  1. 3 x 10^2 m/s
  2. -3 x 10^-2 m/s
  3. 0.3 m/s
  4. 3 X 10^-3 M/S

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Correct Answer : B

Q3. 
The product of mass of a body and the acceleration product it equals the ........... acting on it.
  1. force
  2. impulse
  3. torque
  4. kinetic energy

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Correct Answer : A

Q4. 
Definition of force can be started from
  1. Newton's First Law of Motion
  2. Newton's Second Law of Motion
  3. Newton's Third Law of Motion
  4. Newton's Law of Garvitation

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Correct Answer : B

Q5. 
Acceleration is
  1. inversely proportional to force
  2. inversely proportional to mass
  3. directly proportional to mass
  4. directly proportional to force

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Correct Answer : D

Q6. 
When an object is stationary, then the force is still acting on it is
  1. acceleration
  2. momentum
  3. impluse
  4. weight

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Correct Answer : D

Q7. 
In SI unit of force 'newton' (N) is given by (where, 'kg' stands for 'kilogram', 'm' stands for 'metre ' and 's' stands for 'second')
  1. 1N = 2 kg-ms^-2
  2. 1N = 1 kg-ms^-2
  3. 1N = 4 kg-ms^-2
  4. 1N = 3 kg-ms^-2

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Correct Answer : B

Q8. 
When a force of 1 N acts on a mass of 1 kg, which is able to move freely, the object moves in the direction of force with a/an
  1. speed of 1 km/s
  2. acceleration of 1 m/s^2
  3. speed of 1 m/s
  4. acceleration 1 km/s^2

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Correct Answer : B

Q9. 
The rate of change of momentum of a body is equal to the resultant
  1. energy
  2. power
  3. force
  4. impluse

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Correct Answer : C

Q10. 
According to the second law of motion , for a given force, acceleration is inversely proportional to the .......... of an object
  1. density
  2. volume
  3. force
  4. mass

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Correct Answer : D

Q11. 
Two persons are holding a rope of negligible mass horizontally. A 20 kg mass is attached to the rope at the mid point, as a result, the rope deviates from the horizontal direction. The tension required to completely straighten the rope is (g = 10 m/s^2)
  1. 200 N
  2. 20 N
  3. 10 N
  4. infinitely

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Correct Answer : A

Q12. 
When a force of 100 N is applied on a body of mass 50 kg, then acceleration produced in the body is
  1. 2 m/s^2
  2. 0.2 m/s^2
  3. 0.2 m/s
  4. 2 m/s

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Correct Answer : A

Q13. 
A body of mass 4 kg accelerates from 15 m/s to 25 m/s in 5 seconds due to the application of a force on it. Calculate the magnitude of this force
  1. 32
  2. 8
  3. 16
  4. 64

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Correct Answer : B

Q14. 
The second law of motion states
  1. every object will move in a uniform motion when a net force is applied .
  2. the rate of change of momentum of an object is proportional to the net force applied on the object in the direction of net force.
  3. every object will remain at rest or in a state of uniform motion unless compelled to change its state by the action of a net force.
  4. the rate of change of speed of a body will change with the net force applied.

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Correct Answer : B

Q15. 
For every action, there is an equal and opposite reaction'. The law was given by
  1. Newton
  2. Albert Einstein
  3. Bohr
  4. Oersted

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Correct Answer : A

Q16. 
Action and reaction ...........
  1. always act on same body
  2. are equal in magnitude
  3. are in same direction
  4. always act independently

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Correct Answer : B

Q17. 
If action and reaction were to act on the same body
  1. the resultant would be zero
  2. the body would not move at all
  3. body will start moving
  4. Both (a) and (b)

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Correct Answer : A

Q18. 
Why does a cannon recoil after firing?
  1. Conservation of energy
  2. Backward thrust of gases produced
  3. Newton's third law of motion
  4. Newton's first law of motion

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Correct Answer : C

Q19. 
Rocket works on the principle of
  1. Newton's third law
  2. Newton's first law
  3. Newton's second law
  4. Archimedes principle

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Correct Answer : A

Q20. 
If is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?
  1. Law of inertia
  2. Newton's second law
  3. Newton's third law
  4. Pascal's law

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Correct Answer : C

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