Kirchhoff's Voltage Law (KVL), which states that the algebraic sum of all potential differences in any closed loop is zero, is a direct manifestation of the conservation of: MCQ with Answer and Explanation

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Kirchhoff's Voltage Law (KVL), which states that the algebraic sum of all potential differences in any closed loop is zero, is a direct manifestation of the conservation of:

A. Mass

B. Linear Momentum

C. Electric Charge

D. Energy

Answer: Option D

Solution (By JKExamLibrary)

Kirchhoff's Second Law (KVL) is based on the principle that the electrostatic field is conservative. The work done (energy spent or gained) in moving a unit charge completely around a closed electrical loop must be zero. Therefore, the sum of voltage drops and EMFs is zero. This strictly represents the Law of Conservation of Energy.

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Question #1 Report Error

A body is dropped from a height of 20 m. Its velocity on reaching ground (g=10) is

A. 40 m/s

B. 20 m/s

C. 10 m/s

D. 14.14 m/s

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Correct Answer: Option B

Explanation:
v² = 2gh = 2×10×20=400, v=20 m/s.

This question belongs to: Science Physics

Question #2 Report Error

Which of the following materials is diamagnetic in nature?

A. Nickel

B. Aluminum

C. Water

D. Iron

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Correct Answer: Option C

Explanation:
Materials are classified by their magnetic properties. Ferromagnetic materials (Iron, Cobalt, Nickel) are strongly attracted to magnets. Paramagnetic materials (Aluminum, Platinum) are weakly attracted. Diamagnetic materials (Water, Bismuth, Copper, Gold) are actually weakly repelled by a magnetic field because they create an induced magnetic field in opposition to the externally applied one.

This question belongs to: Science Physics