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NCERT Exemplar · Class 9 · Science

Chapter 3: Atoms and Molecules

Practice each question, then open the answer or worked solution.

Explanation: (2)

1 questions
Q10Written answer

A change in the physical state can be brought about

(a) only when energy is given to the system

(b) only when energy is taken out from the system

(c) when energy is either given to or taken out from the system

(d) without any energy change

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Worked solution

Answer is (c) when energy is either given to or taken out from the system