Assertion :A ball is dropped from a certain height above the free surface of ideal fluid. When the ball enters the liquid it may accelerate or retard. Reason: Ball accelerates or retards, it all depends on the density of ball and 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
Acceleration of the ball in the liquid is given by
$a = g (1 - \frac{ρ_{l}}{ρ_{b}}) when ρ_{l} < ρ_{b}; a > 0 and when ρ_{l} > ρ_{b}; a < 0$
We see that acceleration of the ball is positive or negative depending upon the relative density of liquid and ball. Hence assertion and reason both are correct and Reason is the correct explanation for Assertion.

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Choose the correct option.

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