If a stone is dropped from a balloon rising upwards with a velocity of 10 m/s at a height of 75 m, what is the initial velocity of the stone relative to the ground? MCQ with Answer and Explanation

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If a stone is dropped from a balloon rising upwards with a velocity of 10 m/s at a height of 75 m, what is the initial velocity of the stone relative to the ground?

A. 9.8 m/s downwards

B. 0 m/s

C. 10 m/s downwards

D. 10 m/s upwards

Answer: Option D

Solution (By JKExamLibrary)

Due to the inertia of motion, when an object is dropped from a moving vehicle (or balloon), it inherits the instantaneous velocity of that vehicle. Since the balloon was moving upwards at 10 m/s, the stone's initial velocity relative to the ground is 10 m/s upwards. It will rise slightly before falling.

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In a nuclear reactor, what is the function of the moderator (like heavy water or graphite)?

A. To act as the nuclear fuel.

B. To slow down the fast-moving neutrons so they can cause further fission.

C. To absorb excess neutrons to stop the chain reaction.

D. To transport heat away from the reactor core.

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Correct Answer: Option B

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An electric heater of resistance 10 Ω draws current 5 A. Power consumed is

A. 500 W

B. 2 W

C. 250 W

D. 50 W

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Correct Answer: Option C

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