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RRB Junior Engineer / DMS / CMA 2019 · Question 90 of 3719

Which of the following is NOT a physical change?

General Science - Miscellaneous

  1. Aa. Liquefaction of gases to liquids
  2. Bb. Fermentation of substancesCorrect
  3. Cc. Vaporisation of liquids to gases
  4. Dd. Melting of solids to liquids

Answer: B. b. Fermentation of substances

Explanation

The fermentation of substances is NOT a physical change; it is a chemical change. The other processes (liquefaction, vaporization, and melting) are physical changes.

Source: RRB JE 2019 CBT-1 (24-May-2019 Shift-1) — ixambee compilation with answer key and solutions · reliable-secondary

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