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

Heat and Thermodynamics| Practice MCQs Physics for Mdcat

7 of 106 questions (Page 4 of 16)

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22 Which of the following represents the total energy of the molecules of the substance:
Correct Answer: D
Explanation: Total molecular energy includes all forms of kinetic and potential energy.
23 The average K.E of all the molecules in a substance is a measure of:
Correct Answer: B
Explanation: Temperature is a measure of the average kinetic energy of molecules.
24 The total sum of all the energies of the molecules in a substance is called:
Correct Answer: A
Explanation: Heat energy is the total energy of all molecules in a substance.
25 Keeping temperature of gas constant, the Boyle’s law can be expressed as:
Correct Answer: B
Explanation: Boyle's law states $V \propto \frac{1}{P}$ at constant temperature.
26 When pressure of gas remains constant, the Charle’s law can be expressed as:
Correct Answer: A
Explanation: Charle's law states $V \propto T$ at constant pressure.
27 At constant pressure, the graph between volume (V) and temperature (T) is:
Correct Answer: D
Explanation: At constant pressure, $V$ vs. $T$ is a straight line (Charle's law).
28 Real gases strictly obey gas laws at:
Correct Answer: C
Explanation: Real gases behave ideally at low pressure and high temperature.
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