MCQ Collection
MDCAT Physics MCQs
Practice MDCAT Physics questions with answers and explanations.
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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.
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Correct Answer: D. Conservation of energy in thermal processes
Explanation:
The change in internal energy equals heat added minus work done by the system.
It is an energy-balance statement.
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Correct Answer: D. 30,000 J
Explanation:
Convert 5 minutes to 300 seconds and use E=Pt.
E=100×300 = 30,000 J.
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Correct Answer: A. No heat engine can convert all absorbed heat into work
Explanation:
Real processes have a preferred direction and generate entropy.
Some heat must be rejected by a cyclic heat engine.
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Correct Answer: A. Oscillation in which acceleration is proportional to displacement and directed toward equilibrium
Explanation:
In SHM, the restoring influence grows with displacement.
The acceleration always points toward the equilibrium position.
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Correct Answer: B. 6 m/s
Explanation:
Continuity gives A₁v₁=A₂v₂.
V₂=0.06×2/0.02 = 6 m/s.
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Correct Answer: C. A measure related to the average kinetic energy of particles
Explanation:
Temperature indicates how energetic particle motion is on average.
It determines the direction of spontaneous heat transfer.
