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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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Last updated on Jun 24, 2025

-> The CSIR Junior Secretariat Assistant 2025 has been released for 9 vacancies.

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-> The CSIR JSA salary ranges from INR 19,900 - INR 63,200 (Indian Institute of Petroleum, Dehradun & Institute of Microbial Technology) and INR 35,600 (Indian Institute of Toxicology Research).

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