True False[1 Marks ]

Question 11 Mark

State if the following statements is true or false. Give reasons for your answer:
Total energy of a system is always conserved, no matter what internal and external forces on the body are present.

Answer

False.
Explanation:
The external forces on the body may change the total energy of the body.

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Question 21 Mark

State if the following statements is true or false. Give reasons for your answer:
In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.

Answer

True.
Explanation:
In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system. This is because in such collisions, there is always a loss of energy in the form of heat, sound, etc.

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Question 31 Mark

State if the following statements is true or false. Give reasons for your answer:
In an elastic collision of two bodies, the momentum and energy of each body is conserved.

Answer

False.
Explanation:
In an elastic collision, the total energy and momentum of both the bodies, and not of each individual body, is conserved.

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Question 41 Mark

State if the following statements is true or false. Give reasons for your answer:
Work done in the motion of a body over a closed loop is zero for every force in nature.

Answer

False.
Explanation:
Work done in the motion of a body over a closed loop is zero for a conservation force only.

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Physics True False[1 Marks ]

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