NTSE SAT Physics Energy MCQs

Question: The ratio of S.I. units to C.G.S. units of energy is :

• a) 105 
• b) 106
• c) 107 
• d) 10^-7

Answer: 107 

Question: A body of mass 2 kg is thrown upward with initial velocity 20 m/s. After 2s its kinetic energy will be : (g = 10 m/s²)

• a) 400 J
• b) 200 J
• c) 100 J
• d) Zero

Answer: Zero

Question: Two bodies A and B of equal masses are kept at heights of h and 3h respectively. The ratio of their potential energies is :

• a) 1 : 1
• b) 1 : 3
• c) 1 : 9
• d) 3 : 1

Answer: 1 : 3

Question: A ball is dropped from a height of 10 m. It strikes the ground and rebounds up to a height of 2.5 m. During the collision the percent loss in kinetic energy is :

• a) 25%
• b) 50%
• c) 75%
• d) 100%

Answer: 75%

Question: Two bodies of masses M_A and M_B have equal kinetic energy. The ratio of their momentum is :

• a) M_B : M_A 
• b) M_A : M_B
• c)

  

• d) M²_A : M²_B

Answer:

Question: In the above question the potential energy of the body (after 2 s) will be:

• a) 400 J
• b) 200 J
• c) 100 J
• d) Zero

Answer: 400 J

Question: A body of mass 10 kg is moving with velocity 10 m/sec. The work done to stop the body is :

• a) + 500 J
• b) - 500 J
• c) + 100 J
• d) - 1000 J

Answer: - 500 J

Question: If the kinetic energy of a body in increased by 100% then the percent change in momentum of the body is :

• a) 4.14%
• b) 41.4%
• c) 141.4%
• d) None of these

Answer: 41.4%

Question: A force of 4 N acts on a body of mass 40 kg for a distance of 2 m. The kinetic energy acquired by the body is :

• a) 4 × 2 × 2 J
• b) 4 × 4 × 2 × 108 erg
• c) 4 × 2 J
• d) 4 × 4 × 2 erg

Answer: 4 × 2 J

Question: A body falling with a speed 2 ms-1 strikes the floor nd rebounds with a speed of ms-1. The loss of energy is :

• a) 75%
• b) 50%
• c) 25%
• d) 12.5%

Answer: 75%