Question

Which of the following is not true for a machine?

• A. It can multiply the force
• B. It can increase the speed
• C. It can change the direction of applied force
• D. Its output can be more than the input

Answer 1

The correct option is D

Its output can be more than the input

Explanation

• Law of conservation of energy. : Energy can neither be created nor destroyed, it is only transformed from one form to another.
• The power which is a form of energy, the output will be less than the input power always.
• There is no Engine whose efficiency can be more than 100%.

Hence the answer is ‘Its output can be more than the input’