A force F gives an acceleration a to mass m. If mass doubled and force halved, acceleration becomes MCQ with Answer and Explanation

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A force F gives an acceleration a to mass m. If mass doubled and force halved, acceleration becomes

A. a/2

B. 2a

C. a

D. a/4

Answer: Option D

Solution (By JKExamLibrary)

a' = (F/2)/(2m) = F/(4m) = a/4.

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Question #1

The decimal equivalent of binary number 1101 is

A. 11

B. 15

C. 9

D. 13

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Correct Answer: Option D

Explanation:
1×8 + 1×4 + 0×2 + 1×1 = 13.

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Question #2

A stone tied to a string is whirled in a circle. The work done by tension in string is

A. Zero

B. Negative

C. Variable

D. Positive

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Correct Answer: Option A

Explanation:
Tension is towards centre, displacement is tangential (velocity). Force perpendicular to displacement, cos90°=0, work zero. Centripetal force does no work, doesn't change speed.

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Question #3

Instrument measuring humidity:

A. Barometer

B. Hydrometer

C. Hygrometer

D. Anemometer

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Correct Answer: Option C

Explanation:
Hygrometer measures atmospheric humidity (water vapor content). Barometer: pressure; Hydrometer: liquid density; Anemometer: wind speed. Memory tip: 'Hygro = moisture; meter = measure'. Instrument identification frequently tested in competitive exams to verify practical physics knowledge.

This question belongs to: Science Physics

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