If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct? (a) Raindrops will fall faster. (b) Walking on the ground would become more difficult. (c) Time period of a simple pendulum on the Earth would decrease. (d) g on the Earth will not change.

Answer: (d). g = (GME)/(RE²) does not involve the Sun's mass; G ten times larger makes g ten times larger. Larger g: raindrops fall faster, walking is harder, and T = 2π√(l/g) decreases, so (a), (b), (c) are correct. Statement (d) ( g unchanged) is wrong. So the answer is (d).

If the mass of the Sun were ten times smaller and the universal… | NEET 2018

Q115NEET 2018Medium

Acceleration Due to Gravity

If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?

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Answer: (d)

$g = \frac{GM_E}{R_E^2}$ does not involve the Sun's mass; $G$ ten times larger makes $g$ ten times larger.
Larger $g$ : raindrops fall faster, walking is harder, and $T = 2\pi\sqrt{l/g}$ decreases, so (a), (b), (c) are correct.
Statement (d) ( $g$ unchanged) is wrong.
So the answer is (d).

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