For the Assertion (A) and Reason (R) below, choose the correct alternative:
Assertion (A) : An iron ball floats on mercury but sinks in water.
Reason (R) : The specific gravity of iron is more than that of mercury.

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CSIR CERI JSA Official Paper-I (Held On: 2022)
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  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
  3. (A) is true but (R) is false.
  4.  (A) is false but (R) is true.

Answer (Detailed Solution Below)

Option 3 : (A) is true but (R) is false.
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Detailed Solution

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Assertion (A) An iron ball floats on mercury but sinks in water. → True

Reason (R) The specific gravity of iron is more than that of mercury. → False

Iron is denser than water, so it sinks in water. But mercury is denser than iron, so iron floats on mercury.

Thus, (A) is true but (R) is false.

Hence, "Option 3" is the correct answer.

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