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

Which of the following is NOT a fundamental SI unit?
A. Coulomb
B. Ampere
C. Kelvin
D. Candela
Answer: Option A
Solution (By JKExamLibrary)
Coulomb is the SI unit of electric charge, but it is a derived unit (Ampere × second). The seven fundamental SI units are meter (length), kilogram (mass), second (time), Kelvin (temperature), Ampere (electric current), candela (luminous intensity), and mole (amount of substance). Electric current is fundamental, making Ampere fundamental, not Coulomb.

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Question #1
The product of force and displacement in the direction of force is
A. Momentum
B. Work
C. Energy
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Correct Answer: Option B


Explanation:
Work = F s cosθ. Energy is capacity to do work. Power is rate of work. Momentum = m v. Work and energy have same unit joule.

This question belongs to: Science Physics
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Radioactivity was discovered by
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B. Becquerel
C. Roentgen
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Correct Answer: Option B


Explanation:
Henri Becquerel discovered natural radioactivity in uranium salts (1896). Curie isolated radium, Rutherford classified rays.

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Question #3
Gravity work for horizontal motion:
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Correct Answer: Option C


Explanation:
Gravity acts vertically; horizontal displacement ⇒ angle = 90° ⇒ W = Fd cos90° = 0. No work for perpendicular force-displacement. Memory aid: 'Work = Fd cosθ; θ=90° ⇒ W=0'. Mechanics concept frequently tested to correct misconception that force always does work.

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