A body fully immersed in a fluid experiences an upward buoyant force equal to MCQ with Answer and Explanation

A body fully immersed in a fluid experiences an upward buoyant force equal to
A. Density of the body
B. Weight of the body
C. Weight of the fluid displaced
D. Volume of the body
Answer: Option C
Solution (By JKExamLibrary)
Archimedes' principle: buoyant force = weight of fluid displaced. This force acts upward. If buoyant force ≥ weight, object floats. Submarines use ballast tanks to change weight, altering buoyancy.

This question belongs to: Science Physics

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Question #1 Report Error
The device used to measure the emf of a cell without drawing current is
A. Galvanometer
B. Ammeter
C. Voltmeter
D. Potentiometer

Correct Answer: Option D


Explanation:
Potentiometer: null deflection method, no current drawn from cell.

This question belongs to: Science Physics
Question #2 Report Error
The electrical resistance of a conductor depends on its
A. Colour
B. Transparency
C. Magnetic property
D. Length and area of cross-section

Correct Answer: Option D


Explanation:
R = ρL/A, depends on length (L), cross-sectional area (A), and resistivity (ρ) which depends on material and temperature. Not on colour or transparency.

This question belongs to: Science Physics
Question #3 Report Error
A block of mass 5 kg is pushed against a wall with a horizontal force of 50 N. Coefficient of friction 0.4. The block (g=10)
A. Falls down
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C. Stays at rest
D. Moves sideways

Correct Answer: Option A


Explanation:
Weight = 50 N. Max static friction = μN = 0.4×50 = 20 N, insufficient to hold. So block slides down.

This question belongs to: Science Physics