Physics
Assertion (A) : An iron nail sinks in water, but floats in mercury.
Reason (R) : The density of iron is equal to density of mercury but greater than water.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Fluids Upthrust
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Answer
assertion is true but reason is false
Explanation
Assertion (A) is true because iron is denser than water, so it sinks in water and mercury is denser than iron, so iron floats in mercury.
Reason (R) is false because density of iron is not equal to mercury and is lower than mercury.
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Reason (R) : This is so because of upthrust of air on body.
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