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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 19, 2025

->The CSIR Junior Secretariat Assistant Merit List & Final Response Sheet has been released.

-> The CSIR Junior Secretariat Assistant 2025 written examination for Advt No. CRRI/02/PC/JSA-JST/2025 was conducted from 13th to 19th May 2025.

-> Candidates had applied online from 22nd March to 21st April 2025.  

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

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