NUMS Mdcat 2022 | Solved with Explanation | mosaicbro.com

NUMS Mdcat 2022 | Solved with Explanation

7 of 157 questions (Page 11 of 23)

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71 Transformer works on the principle of:
Correct Answer: C
Explanation: Transformers use mutual induction to transfer energy between coils.
72 A device that converts AC into DC is called:
Correct Answer: D
Explanation: Rectifiers convert AC to DC using diodes.
73 The conversion of alternating current into direct current is called:
Correct Answer: B
Explanation: Rectification is the process of converting AC to DC.
74 1 Gy is equal to:
Correct Answer: B
Explanation: 1 Gray (Gy) = 1 Joule of absorbed energy per kilogram of mass (J/kg).
75 A 32g radioactive element decays and remains 2g after 60 days. What is the half-life of radioactive element?
Correct Answer: D
Explanation: 32g → 2g = 4 half-lives (32 → 16 → 8 → 4 → 2). 60 days ÷ 4 = 15 days per half-life.
76 An elastic collision is the one in which:
Correct Answer: A
Explanation: Elastic collisions conserve both kinetic energy and momentum.
77 The time rate of change of velocity is called:
Correct Answer: B
Explanation: Acceleration = Δv/Δt.
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