Physics - Work Energy and Power
- Option : A
- Explanation : (A) When a body falls freely, the potential energy due to its height converted into kinetic energy due to its motion.
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3. Heat energy of an object is
- Option : B
- Explanation : (B) Heat energy or thermal energy of an object is the total thermal kinetic energy and thermal potential energy of all its atoms and molecules. So, we can say that heat energy of an object is the total energy of the molecules of the object
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4. Rocket works on the principle of conservation of
- Option : C
- Explanation : (C) A rocket works by expelling gases from one end at a very high speed which inturn, upthrust the rocket. This illustrates law of conservation of momentum.
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5. The momentum of a heavy object at rest will be
- Option : A
- Explanation : (A) Momentum = Mass x velocity
At rest velocity = 0
So, momentum = 0
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