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Physics - JEE MAIN 2023 MCQs - ObjectiveMcq

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JEE MAIN 2023 Physics Questions

Browse the question list for Physics in JEE MAIN 2023.

2 questions · Page 1 of 1

Two resistors of 4 Ω and 6 Ω are connected in parallel across a 12 V supply. What is the total current drawn from the supply?

1.2 A

2 A

5 A

3 A

Answer and explanation

Correct Answer: C — 5 A

Current through 4 Ω: $I_1 = 12/4 = 3$ A. Current through 6 Ω: $I_2 = 12/6 = 2$ A. Total: $I = 3 + 2 = 5$ A.

If the radius of the Earth were doubled (mass unchanged), what would happen to the value of g (acceleration due to gravity) at the surface?

g would double

g would remain the same

g would become one-fourth

g would halve

Answer and explanation

Correct Answer: C — g would become one-fourth

$g = GM/R^2$ . If R doubles, $g$ becomes $GM/(2R)^2 = g/4$ . So g becomes one-fourth.