MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: C. for
Explanation:
'Responsible for' is the standard adjective-preposition combination.
It identifies the duty assigned to the person.
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Correct Answer: D. 200 kPa
Explanation:
Boyle's law gives P1V1=P2V2.
P2=100×4/2 = 200 kPa.
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Correct Answer: A. 4 L
Explanation:
Charles's law gives V/T constant.
V2=3×400/300 = 4 L.
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Correct Answer: B. 4986 J
Explanation:
The ideal-gas equation gives PV=nRT.
PV=2×8.31×300 = 4986 J.
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Correct Answer: C. 300 J
Explanation:
Using ΔU=Q-W for work done by the gas.
ΔU=500-200 = 300 J.
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Correct Answer: D. -300 J
Explanation:
Take Q=-400 J and work done by the gas W=-100 J.
ΔU=Q-W=-400-(-100)=-300 J.
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Correct Answer: A. A model gas whose particles have negligible volume and no intermolecular forces except during collisions
Explanation:
The ideal gas model simplifies real gas behavior.
It works best at low pressure and high temperature.
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Correct Answer: A. 30%
Explanation:
Efficiency is work output divided by heat input.
300/1000×100 = 30%.
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Correct Answer: B. Pressure is inversely proportional to volume
Explanation:
For an isothermal ideal-gas process, PV is constant.
Reducing volume raises pressure.
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Correct Answer: B. 400 J
Explanation:
Energy conservation gives W=Qin-Qout.
W=1200-800 = 400 J.
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Correct Answer: C. Volume is proportional to absolute temperature
Explanation:
At fixed pressure, heating an ideal gas increases its volume.
Temperature must be measured on an absolute scale.
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Correct Answer: C. 3
Explanation:
Refrigerator COP is heat removed divided by work input.
COP=600/200 = 3.
