Heat and Thermodynamics| Practice MCQs Physics for Mdcat | mosaicbro.com

Heat and Thermodynamics| Practice MCQs Physics for Mdcat

7 of 106 questions (Page 7 of 16)

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43 The change in length per unit length per Kelvin rise temperature is called:
Correct Answer: C
Explanation: This is the definition of the coefficient of linear expansion.
44 The linear thermal expansion is related to:
Correct Answer: D
Explanation: Linear expansion is primarily a property of solids.
45 When most substances are heated:
Correct Answer: D
Explanation: Heating generally causes expansion, volume increase, and density decrease.
46 The change in volume per unit volume per Kelvin rise in temperature is called:
Correct Answer: D
Explanation: This is the definition of the coefficient of volume expansion.
47 The relation between coefficient of linear expansion $\alpha$ and coefficient of volume expansion $\beta$ is:
Correct Answer: D
Explanation: For isotropic materials, $\beta = 3\alpha$.
48 An inflated tyre suddenly bursts, due to which the temperature of air:
Correct Answer: A
Explanation: Rapid expansion causes cooling (adiabatic process).
49 SI unit of coefficient of linear expansion (or volume expansion) is:
Correct Answer: D
Explanation: The SI unit is per Kelvin ($K^{-1}$).
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