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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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Latest CSIR Junior Secretariat Assistant Updates

Last updated on May 21, 2025

->The CSIR Junior Secretariat Assistant Provisional Response Sheet has been released on 21st May 2025 at the official website.

-> The CSIR Junior Secretariat Assistant Notification 2025 written examination dates has been released for Advt No. CRRI/02/PC/JSA-JST/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).

-> The selection of candidates for this post will be based on a Written Exam, followed by a Computer Typing Test.

-> Prepare for the exam with CSIR Junior Secretariat Assistant Previous Year Papers.

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