The gravitational force between two masses is F. If the distance is tripled, force becomes MCQ with Answer and Explanation

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The gravitational force between two masses is F. If the distance is tripled, force becomes

A. 9F

B. F/9

C. F/3

D. 3F

Answer: Option B

Solution (By JKSSB Mock Tests)

F ∝ 1/r², so if r→3r, F→F/9.

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The power of accommodation of the eye is due to

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B. Change in cornea

C. Change in retina

D. Change in curvature of lens

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Correct Answer: Option D

Explanation:
Ciliary muscles change lens shape, altering focal length.

This question belongs to: Science Physics

Question #2

The number of significant figures in the measurement 0.0050200 m is:

A. 8

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Correct Answer: Option D

Explanation:
According to the rules of significant figures, leading zeros (0.00) are never significant as they only indicate the position of the decimal point. However, trailing zeros after a decimal point are always significant. Therefore, in 0.0050200, the significant digits are 5, 0, 2, 0, and 0, making a total of 5 significant figures.

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Question #3

Atmospheric pressure at sea level in pascal is approximately

A. 1.01 × 10⁹ Pa

B. 1.01 × 10³ Pa

C. 1.01 × 10⁵ Pa

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Correct Answer: Option C

Explanation:
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