Assertion (A): In a free fall, a heavy object falls faster than a light object. Reason (R): Acceleration due to gravity is same for all objects. MCQ with Answer and Explanation

Question

Assertion (A): In a free fall, a heavy object falls faster than a light object. Reason (R): Acceleration due to gravity is same for all objects.

A. Both A and R true, R is correct explanation

B. A is true, R is false

C. Both A and R true, R not correct explanation

D. A is false, R is true

Answer: Option D

Solution (By JKSSB Mock Tests)

In vacuum, all objects fall at same rate. A is false. R is true. So C correct.

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The working principle of a hydrogen bomb is

A. Nuclear fission

B. Nuclear fusion

C. Radioactive decay

D. Chemical reaction

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Correct Answer: Option B

Explanation:
Hydrogen bomb (thermonuclear weapon) uses uncontrolled nuclear fusion of hydrogen isotopes, triggered by a fission bomb. Releases enormous energy. Sun also uses fusion. Fission used in atomic bomb.

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Question #2

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A. Sound speed measurement

B. Both

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D. Neither

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Correct Answer: Option B

Explanation:
Beats: tune instruments (zero beat = matched frequency); measure sound speed via known frequency difference. Memory tip: 'Beats: tuning and measurement applications'. Wave phenomenon application frequently tested in competitive exams.

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