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NDA 2024 GAT · General Knowledge · Fluids and Pressure · hard

A solid body weighs 60 N in air and 40 N when completely immersed in water. Its relative density is

Single correct option

A solid body weighs 60 N in air and 40 N when completely immersed in water. Its relative density is
  1. A. 1.5
  2. B. 2
  3. C. 6
  4. D. 3
Show answer and solution

Answer: (D) 3

Loss of weight = buoyant force = 60 - 40 = 20 N. Relative density = weight in air / loss of weight in water = 60/20 = 3. The trap is 1.5, from dividing 60 by 40, which ignores that it is the loss of weight that counts.
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Original question written in the NDA 2024 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake