NUMS Mdcat 2022 | Solved with Explanation | mosaicbro.com

NUMS Mdcat 2022 | Solved with Explanation

7 of 157 questions (Page 21 of 23)

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141 The conversion of alternating current into direct current is called:
Correct Answer: B
Explanation: Rectification is the process of converting AC to DC.
142 1 Gy is equal to:
Correct Answer: B
Explanation: 1 Gray (Gy) = 1 Joule of absorbed energy per kilogram of mass (J/kg).
143 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.
144 An elastic collision is the one in which:
Correct Answer: A
Explanation: Elastic collisions conserve both kinetic energy and momentum.
145 The time rate of change of velocity is called:
Correct Answer: B
Explanation: Acceleration = Δv/Δt.
146 In projectile motion, the range of projectile will be maximum at an angle of:
Correct Answer: B
Explanation: Maximum range is achieved at 45° (assuming no air resistance).
147 Which of the following is NOT TRUE?
Correct Answer: D
Explanation: Action-reaction pairs act on different bodies and thus cannot cancel each other.
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