Question

A machine is, not 100% efficient because :

• A. the output of the machine is always less than the input.
• B. the output of the machine is always more than the input.
• C. the output of the machine is always equal to the input.
• D. None of these.

Answer 1

The correct option is A

the output of the machine is always less than the input.

In a machine, there is always some loss of energy due to friction between different parts of the machine, as a result of which the output of the machine is always less than the input. Hence, no machine is 100% efficient.