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Force Motion and Energy

1. 

A loudspeaker converts

A. electrical energy into sound energy B. sound energy into electrical energy C. small sound into a large sound D. none of these

Answer : A. electrical energy into sound energy

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2. 

The formula to calculate the force is

A. F = ma B. F = p×h C. F = d×h D. F = a×h

Answer : A. F = ma

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3. 

Non-conventional source of energy best suited for India is

A. Solar energy B. Wind energy C. Tidal wave energy D. Nuclear energy

Answer : A. Solar energy

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4. 

Which of the following functions is performed by a photo-cell?

A. It converts magnetic energy into electrical energy B. It converts chemical energy into electrical energy C. It converts electrical energy into light energy D. It converts light energy into electrical energy

Answer : D. It converts light energy into electrical energy

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5. 

Which one of the following device converts electrical energy into mechanical energy

A. transformer B. inductor C. dynamo D. electric motor

Answer : D. electric motor

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6. 

In a dynamo

A. Mechanical energy is converted into electrical energy B. electrical energy is converted into mechanical energy C. electrical energy is converted into heat energy D. electrical energy is converted into light energy

Answer : A. Mechanical energy is converted into electrical energy

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