MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: C. 2 × 10^-5 °C^-1
Explanation:
Use α=ΔL/(LΔT).
α=0.002/(2×50)=2×10^-5 °C^-1.
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Correct Answer: D. Energy absorbed or released during a phase change without temperature change
Explanation:
Latent heat changes molecular arrangement rather than temperature.
Fusion and vaporization involve different latent heats.
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Correct Answer: A. Increase in dimensions caused by a temperature rise
Explanation:
Heating usually increases average particle separation.
Solids, liquids, and gases expand by different amounts.
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Correct Answer: B. Heat transfer through microscopic interactions without bulk material flow
Explanation:
Conduction transfers energy through collisions and free electrons.
It is dominant in many solids.
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Correct Answer: C. Heat transfer by bulk motion of a fluid
Explanation:
Convection combines fluid motion with thermal energy transport.
It may be natural or forced.
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Correct Answer: D. -125 kJ/mol
Explanation:
Heat release gives a negative enthalpy sign.
-250 kJ divided by 2 mol equals -125 kJ/mol.
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Correct Answer: D. Energy transfer by electromagnetic waves
Explanation:
Thermal radiation can travel through vacuum.
Its intensity increases strongly with absolute temperature.
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Correct Answer: A. 4180 J
Explanation:
Use q=mcΔT.
Q=100×4.18×10 = 4180 J.
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Correct Answer: B. 1.0 J/g·°C
Explanation:
Use c=q/(mΔT).
C=1000/(50×20)=1.0 J/g·°C.
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Correct Answer: C. 300 N
Explanation:
Buoyant force equals ρVg.
F=1000×0.03×10 = 300 N.
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Correct Answer: D. 0.75
Explanation:
For floating equilibrium, submerged fraction equals object density divided by fluid density.
750/1000 = 0.75.
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Correct Answer: A. 0.12 m³/s
Explanation:
Volume flow rate is Q=Av.
Q=0.04×3 = 0.12 m³/s.
