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Question

Expansion in a substance is :
  1. Directly proportional to rise in the temperature
  2. Inversely proportional to rise in the temperature
  3. Independent of rise in temperature
  4. Cannot say

A
Directly proportional to rise in the temperature
B
Inversely proportional to rise in the temperature
C
Independent of rise in temperature
D
Cannot say
Solution
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When heat is applied to a body, the rate of vibration and the distances between the molecules composing it are increased and, hence, the space occupied by the body, i.e., its volume, increases.

So, expansion in a substance is directly proportional to rise in the temperature.

Hence, option A is correct.

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