A certain machine is very efficient.

What does this mean?

It produces a large amount of power.

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It uses very little energy.

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It wastes very little energy.

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It works very quickly.

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Solution

The correct option is C

It wastes very little energy.

If a machine is very efficient, that implies it wastes very little enegy and uses most of the energy in doing some useful work.

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Which of these do you think uses less electrical energy - electric bulb or LED?

Ans) LED will use very little electrical energy .In an electric bulb most of the electrical energy gets converted into heat energy and very little light energy is given out . Whereas in LED more light energy is given out as compared to electric bulb and little heat energy is produced.

Could you please check my answer.

Select a suitable option to complete the sentence:

Practically, very little work could be completed in the last week as it was _______

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A certain machine is very efficient. What does this mean?

The correct option is C It wastes very little energy. If a machine is very efficient, that implies it wastes very little enegy and uses most of the energy in doing some useful work.

A certain machine is very efficient.

What does this mean?

The correct option is C

It wastes very little energy.

If a machine is very efficient, that implies it wastes very little enegy and uses most of the energy in doing some useful work.