Mechanical Properties of Fluids: Fluid Mechanics

In this quiz, you will find questions based on fluid mechanics, Archimedes principle, thrust, pressure, etc.

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When the area decreases _____

pressure increases pressure decreases pressure remains constant the change in pressure cannot be determined

A force F is applied on a uniform rod of cross-section A and a force F’ is applied on a uniform rod of cross-section 3A. What is the relation between F and F’ if the pressure on both is the same?

F/F’ = 1/3 F/F’ = 3 F’/F = 1/3 F/F’ = 1/9

A force is applied on a cube of side 3m. Another force, double the magnitude of the previous force is applied on a cube of 1m. What is the ratio of pressure on the first cube (P) to the pressure on the second cube (P’)?

1/9 18 1/18 1/2

Surface tension of a soap solution is 1.9 × 10-2N/m. work done in blowing a bubble of 2.0 cm diameter will be

7.6 × 10-6 p J 15.2 × 10-6 p J 1.9 × 10-6 p J 1 × 10-4 p J

Plants get water through the roots because of

Capillarity Viscosity Gravity Elasticity

Choose the wrong statement from the following.

Small droplets of a liquid are spherical due to surface tension Oil rises through the wick due to capillarity In drinking the cold drinks through a straw, we use the phenomenon of capillarity Gum is used to stick two surfaces. In this process we use the property of Adhesion

The height of a liquid in a fine capillary tube

Increases with an increase in the density of a liquid Decreases with a decrease in the diameter of the tube Decreases with an increase in the surface tension Increases as the effective value of acceleration due to gravity is decreased

At critical temperature, the surface tension of a liquid

Is zero Is infinity Is the same as that at any other temperature Can not be determined

Hydraulic lifts and hydraulic brakes are based on

Pascal's law

Bernoulli's principle

Archimedes' principle

Stoke's law

According to Archimede’s principle, loss of weight of a body immersed in a liquid is equal to

Weight of the liquid displaced

Weight of the total liquid

Weight of the body

None of these