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Question

In which of the following cases, a pully cannot be used?

A
Helping a trolley move across a river.
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B
Helping a blind man cross the road.
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C
Taking out water form a well.
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D
Lifting bricks to a height.
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Solution

The correct option is B Helping a blind man cross the road.
Pulley is a small wheel with a rope or chain that is used to lift something up. Pulleys are useful for a trolley move across a river, for taking out water form a well and for lifting bricks to a height. However, it is not useful for blind man to cross the road.

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