The mass number of an element is sum of MCQ with Answer and Explanation

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The mass number of an element is sum of

A. Neutrons and electrons

B. Protons and neutrons

C. Protons and electrons

D. Protons only

Answer: Option B

Solution (By JKSSB Mock Tests)

Mass number A = Z + N.

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Question #1

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The speed of sound in air at 0°C is approximately

A. 340 m/s

B. 330 m/s

C. 300 m/s

D. 350 m/s

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Correct Answer: Option B

Explanation:
At 0°C, speed ~ 331 m/s. At room temperature (20°C) ~ 343 m/s, often taken as 340. Increases with temperature v ∝ √T. For many problems 340 is used, but at 0°C it's 331. So option A.

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Question #2

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The gas used in refrigerators is

A. Carbon dioxide

B. Freon

C. Nitrogen

D. Oxygen

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Correct Answer: Option B

Explanation:
Freon (CFC) was used as refrigerant; now HFCs used. Freon is common answer in exams.

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Question #3

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In uniform circular motion, which of the following is constant?

A. Centripetal acceleration

B. Velocity

C. Kinetic energy

D. Linear momentum

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Correct Answer: Option C

Explanation:
Speed constant, so kinetic energy (½mv²) constant. Velocity, acceleration, momentum change direction.

This question belongs to: Science Physics

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