Multiple choice

Which of the following changes can be controlled? p. Rusting of iron. q. Spoiling of milk. r. Phases of the moon.

  1. p and q

  2. q and r

  3. p and r

  4. only r

  5. p, q and r
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Both these changes can be controlled. Rusting of iron happens over a long period of time and if treated right it can be prevented. Similarly milk can be prevented from spoiling by turning into curd or by boiling and pasteurization.

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