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

Heat and Thermodynamics| Practice MCQs Physics for Mdcat

7 of 106 questions (Page 11 of 16)

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71 A system in which there is no transfer of mass and energy across the boundary is called:
Correct Answer: B
Explanation: Isolated systems have no mass or energy transfer.
72 The rate of cooling of a body depends on:
Correct Answer: C
Explanation: Cooling rate depends on temperature difference (Newton's law of cooling).
73 The first law of thermodynamics is merely a statement of:
Correct Answer: C
Explanation: First law states energy conservation: $\Delta U = Q - W$.
74 Which of the following relations express first law of thermodynamics:
Correct Answer: A
Explanation: First law: $\Delta Q = \Delta U + \Delta W$.
75 In SI units, Joule is the unit of:
Correct Answer: D
Explanation: Joule measures heat, work, and energy.
76 The process in which the temperature of the system remains constant is called:
Correct Answer: B
Explanation: Isothermal processes maintain constant temperature.
77 In which of the following processes no heat enters or leaves the system:
Correct Answer: D
Explanation: Adiabatic processes have no heat transfer.
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