Assertion :Upthrust on a solid block of iron when immersed in a lake will be less on the surface than on the bed of the lake. Reason: On the surface of the lake density of water will be less than that at the bed and upthrust depends on the density of liquid.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
If we can approximate the lake as an ideal gas,

$P M = ρ R T$

Now, at the bottom of the lake, the pressure is more. As a result, the density will also be more for all other parameters held constant.

Therefore, the reason is correct and it explains the assertion correctly

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