MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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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.
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Correct Answer: D. Energy transferred because of a temperature difference
Explanation:
Heat is energy in transit between systems.
It flows spontaneously from higher to lower temperature.
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Correct Answer: A. A state in which systems in contact have no net heat transfer
Explanation:
Systems in thermal equilibrium have the same temperature.
This idea underlies the zeroth law of thermodynamics.
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Correct Answer: B. The basis for defining temperature and thermal equilibrium
Explanation:
If two systems are each in thermal equilibrium with a third, they are in equilibrium with each other.
This permits consistent temperature measurement.
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Correct Answer: C. Heat required to raise unit mass by one degree of temperature
Explanation:
Specific heat capacity describes thermal inertia.
Materials with high values require more heat for the same temperature rise.
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Correct Answer: D. Enthalpy change forming one mole of compound from elements in standard states
Explanation:
Standard formation enthalpies are tabulated reference values.
Elements in their standard states have ΔHf° defined as zero.
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Correct Answer: D. The equilibrium generally shifts toward products
Explanation:
The reaction produces more product to replace what was removed.
This is an application of Le Chatelier's principle.
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Correct Answer: A. Energy required to break one mole of specified gas-phase bonds
Explanation:
Bond enthalpies are average values for many molecules.
Breaking bonds requires energy, while forming bonds releases energy.
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Correct Answer: A. It favors the product side
Explanation:
Higher pressure favors the side occupying less gas volume.
That is usually the side with fewer gas moles.
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Correct Answer: B. Energy is conserved
Explanation:
Energy may be transferred as heat or work.
It is not created or destroyed.
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Correct Answer: B. No
Explanation:
A catalyst lowers activation energies for both directions.
It speeds equilibration without changing the equilibrium position.
