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. 3F

C. F/9

D. F/3

Answer: Option C

Solution (By JKSSB Mock Tests)

F ∝ 1/r², so if r→3r, F→F/9.

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What is the excess pressure strictly inside a soap bubble of radius R and surface tension T?

A. 4T / R

B. 2T / R

C. T / 2R

D. T / R

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Correct Answer: Option A

Explanation:
A liquid drop has only one free surface, so its excess pressure is P = 2T/R. However, a soap bubble in the air has two completely free surfaces (an inner one and an outer one). Because both surfaces exert surface tension forces inward, the total excess pressure inside a soap bubble is exactly double: P = 4T/R.

This question belongs to: Science Physics