Which of the following has M.A. of 1?
AInclined plane
BSingle movable pulley
CBlock and tackle
DSingle fixed pulley
Answer & Solution
Correct answer: D. Single fixed pulley
1. A single fixed pulley merely changes the direction of force.
2. The applied effort equals the load (ignoring friction).
3. So M.A. = 1.
4. Other options give M.A. > 1.
_Source: Selina Concise Physics ICSE Class 10, Ch 3 'Machines' (aplustopper.com extract)_
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