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A single fixed pulley is used because it:

(a) Has a mechanical advantage greater than 1
(b) Has a velocity ratio less than 1
(c) Gives 100% efficiency
(d) Helps to apply the effort in a convenient direction.

Solutions:

The correct option is (d) helps to apply the effort in a convenient direction.

A single fixed pulley is used because it helps to apply the effort in a convenient direction.