Which of the following is not a fundamental unit in SI? MCQ with Answer and Explanation

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Which of the following is not a fundamental unit in SI?

A. Kelvin

B. Ampere

C. Kilogram

D. Newton

Answer: Option D

Solution (By JKSSB Mock Tests)

Fundamental units: kg, m, s, A, K, mol, cd. Newton is derived (kg m/s²). Therefore, Newton is not fundamental. Remember the seven base units.

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Question #1

Two 100 W, 200 V bulbs are connected in series across 200 V supply. Total power consumed is

A. 200 W

B. 100 W

C. 25 W

D. 50 W

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Correct Answer: Option D

Explanation:
Each bulb resistance R = V²/P = 40000/100 = 400 Ω. In series, total R = 800 Ω. Total power P_total = V²/(total R) = 200²/800 = 40000/800 = 50 W. So each bulb gets 25 W. Series reduces power.

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Question #2

Which of the following is used as a moderator in nuclear reactor?

A. Boron

B. Cadmium

C. Graphite

D. Uranium

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Correct Answer: Option C

Explanation:
Graphite, heavy water (D₂O), beryllium are moderators. Cadmium and boron are control rods (absorb neutrons). Uranium is fuel. Moderator slows neutrons.

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Question #3

The law of conservation of energy states that

A. Energy can be destroyed but not created

B. Energy can neither be created nor destroyed, only transformed

C. Energy can be created but not destroyed

D. Total energy always increases

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Correct Answer: Option B

Explanation:
First law of thermodynamics: Energy is conserved in an isolated system. It changes forms (kinetic to potential etc.) but total constant. Perpetual motion machine impossible.

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