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

Heat and Thermodynamics| Practice MCQs Physics for Mdcat

7 of 106 questions (Page 5 of 16)

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29 “Volume of a gas is directly proportional to its temperature (absolute) while keeping pressure constant”, this is called:
Correct Answer: B
Explanation: This is the statement of Charle's law.
30 “Volume of a gas is inversely proportional to its pressure while keeping temperature constant”, this is called:
Correct Answer: A
Explanation: This is the statement of Boyle's law.
31 For a gas obeying Boyle’s law if the pressure is doubled, the volume becomes:
Correct Answer: C
Explanation: According to Boyle's law, $P_1V_1 = P_2V_2$. If $P_2 = 2P_1$, then $V_2 = \frac{V_1}{2}$.
32 The K.E. of the molecules of an ideal gas at absolute zero will be:
Correct Answer: A
Explanation: At absolute zero, molecular motion ceases, so K.E. is zero.
33 At absolute zero of temperature, the molecules have:
Correct Answer: D
Explanation: At absolute zero, all molecular motion stops.
34 In an ideal gas, the molecules have:
Correct Answer: A
Explanation: Ideal gas molecules have negligible intermolecular forces, so only kinetic energy.
35 The molecules of the gas exert pressure on the walls of the container due to:
Correct Answer: B
Explanation: Gas pressure results from collisions of molecules with container walls.
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