JKSSB Mock Tests

Assertion: A machine cannot have an efficiency of 100%. Reason: Some energy is always lost to overcome friction.

A. both assertion and reason are true, reason explains assertion
B. both assertion and reason are true, reason does not explain assertion
C. assertion is true but reason is false
D. assertion is false but reason is true
Answer: Option A
Solution (By JKSSB Mock Tests Team)
In practical machines, friction dissipates input energy as heat, making 100% mechanical efficiency impossible.
This Question Belongs to: General science Physics set 1
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