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MCQ: If a stone of mass 500 g strikes ground with velocity of 20 ms-1 then kinetic energy at that point is

1. 10 J
2. 40 J
3. 75 J
4. 100 J

D

MCQ: Capacity of a body to do work is called

1. energy
3. kinetic energy
4. potential energy

A

MCQ: Relation between mass ‘m’, speed of light ‘c’ and energy ‘E’ can be written as

1. E = m + c
2. E = m - c
3. E = m c²
4. E = m c

C

MCQ: If some energy given to a system, then energy in required form obtained is always

1. less than the given energy
2. equal to the given energy
3. greater than the given energy
4. none of above

A

MCQ: In process of rubbing hands, mechanical energy is converted into

1. sound energy
2. electrical energy
3. thermal energy
4. heat energy

D