Which of the following statements is/are incorrect? (i) Air expands on heating. (ii) Airexpands on cooling. (iii) Air rises on heating. (iv) Air becomes lighter on heating.A. (ii) and (iii)B. (ii) and (iv)C. only (ii)D. (i), (ii) and (iv)
Question
Which of the following statements is/are incorrect? (i) Air expands on heating. (ii) Airexpands on cooling. (iii) Air rises on heating. (iv) Air becomes lighter on heating.A. (ii) and (iii)B. (ii) and (iv)C. only (ii)D. (i), (ii) and (iv)
Solution
The correct answer is C. only (ii).
Here's why:
(i) Air expands on heating: This is correct. When air is heated, the particles move faster and spread out, causing the air to expand.
(ii) Air expands on cooling: This is incorrect. When air is cooled, the particles slow down and come closer together, causing the air to contract, not expand.
(iii) Air rises on heating: This is correct. When air is heated, it becomes less dense (lighter) than the surrounding cooler air, which causes it to rise.
(iv) Air becomes lighter on heating: This is correct. As mentioned above, heated air is less dense than cooler air, which makes it "lighter" and causes it to rise.
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