MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
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Correct Answer: B. 500 Hz
Explanation:
Frequency is speed divided by wavelength.
F=340/0.68 = 500 Hz.
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Correct Answer: C. 2 s
Explanation:
Period is total time divided by number of cycles.
30/15 = 2 s.
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Correct Answer: D. 2 Hz
Explanation:
Frequency is reciprocal of period.
F=1/0.5 = 2 Hz.
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Correct Answer: A. A wave whose particle oscillations are parallel to propagation
Explanation:
Longitudinal waves contain compressions and rarefactions.
Sound in air is longitudinal.
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Correct Answer: B. Distance between successive points in the same phase
Explanation:
Wavelength may be measured between adjacent crests or compressions.
It is related to speed and frequency.
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Correct Answer: C. Distance traveled by a wave disturbance per unit time
Explanation:
Wave speed depends on the medium for mechanical waves.
It equals frequency times wavelength.
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Correct Answer: D. Superposition of waves producing reinforcement or cancellation
Explanation:
When waves overlap, their displacements add.
Constructive interference reinforces, while destructive interference reduces amplitude.
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Correct Answer: A. A spontaneous cell reaction under standard conditions
Explanation:
Positive E° corresponds to negative standard Gibbs energy.
The written cell reaction is thermodynamically favorable.
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Correct Answer: A. Spreading of waves around obstacles or through openings
Explanation:
Diffraction is strongest when the opening or obstacle is comparable to wavelength.
It is a general wave property.
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Correct Answer: B. Use of electrical current to cause chemical change
Explanation:
Electrolysis drives oxidation and reduction at electrodes.
It is used in plating, refining, and chemical production.
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Correct Answer: B. A wave pattern with fixed nodes and antinodes
Explanation:
Standing waves form from superposition of opposite traveling waves.
Nodes remain at zero displacement.
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Correct Answer: C. 3
Explanation:
PH=-log(1×10^-3).
The result is 3.
