Question

Apparent loss of weight of a body when immersed in a liquid can be explained on the basis of-
(A) molecular theory
(B) electron theory
(C) Archimedes principle
(D) Bernoulli’s theorem

Answer 1

Hint
The weight of a body is the same as the gravitational effect by which the earth pulls the body towards its surface. The weight of the body depends on the density, volume, and gravity of the earth. The weight of the body changes with the variation in density, volume, and gravity. The gravity varies with the height of the body from the surface.

Complete step by step answer
The molecular theory explains the movement of the molecules inside a body. The molecules move randomly and collide with each other. The total weight of the body is the same as the average weight of all the molecules. The molecular theory does not explain the apparent loss of weight of a body, so the option (A) is incorrect.
The electron theory explains the behavior of the subatomic particles of a body. The subatomic particles are electrons, protons, and neutrons. These subatomic particles' composition decides the physical and chemical properties only, so the option (B) is incorrect.
Archimedes principle explains the behavior of the movement of the body due to immersion in the liquid. The body displaces the amount of weight of the liquid equal to its weight. The body experiences the loss of weight due to the liquid displaced because buoyancy force acts opposite to the body's weight, so the option (C) is correct.
Bernoulli’s theorem describes the flow of liquid between different positions, so the option (D) is incorrect.
Therefore, the apparent loss of weight of a body when immersed in a liquid can be explained on the basis of Archimedes principle and the option (C) is correct.

Note
The apparent loss of weight experiences due to the reduction in weight. The weight reduces because the buoyancy force acts opposite to the body's weight and depends on the weight of the liquid displaced by the body.