Daily Practice Problems
Class 11 Physics
Mechanical Properties of Fluids Question 1.

How many Pascals is equal to 1 atm?

Question 2.

Give units and dimensions for Pressure and Density.

Question 3.

What is the pressure on a swimmer 8 m below the surface of a lake?

Question 4.

How do you define “average pressure” in case of a fluid?

Question 5.

Give some units of Pressure and relate them with Pascal.

Question 6.

Ankita having mass 45 kg wearing high heel shoes balances on a single heel. The heel is circular with a diameter 0.5 cm. What is the pressure exerted by the heel on the horizontal floor?

Question 7.

What does Pascal’s law state?

Question 8.

What is the largest average velocity of blood flow in an artery of radius 1.5×10–3 m if the flow must remain laminar? (b) What is the corresponding flow rate? (Take viscosity of blood to be 2.084 × 10–3 Pa-s).

Question 9.

Give a pressure and density relation in an incompressible fluid.

Question 10.

A U-shaped wire is dipped in a soap solution, and removed. The thin soap film formed between the wire and the light slider supports a weight of 2.0 × 10–2 N (which includes the small weight of the slider). The length of the slider is 25 cm. What is the surface tension of the film?

Question 11.

The cylindrical tube of a spray pump has a cross-section of 10.0 cm2 one end of which has 50 fine holes each of diameter 0.5 mm. If the liquid flow inside the tube is 2.0 m-min–1, what is the speed of ejection of the liquid through the holes?

Question 12.

State Bernoulli’s principle.

Question 13.

A plane is in level flight at constant speed and each of its two wings has an area of 30 m2. If the speed of the air is 210 km/h over the lower wing and 250 km/h over the upper wing surface, determine the plane’s mass. (Take air density to be 1 kg m–3).

Question 14.

What is gauge pressure?

Question 15.

What is the pressure inside the drop of mercury of radius 2.00 mm at room temperature? Surface tension of mercury at that temperature (20 °C) is 4.65 × 10–1 N-m–1. The atmospheric pressure is 1.01 × 105 Pa. Also give the excess pressure inside the drop.

Question 16.

What is Stokes’ law?

Question 17.

How do you define the term “coefficient of viscosity”? Give units and dimensions for viscosity.

Question 18.

A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 12.0 cm of water in one arm and 15.0 cm of spirit in the other. What is the specific gravity of spirit?

Question 19.

What are the units and dimensions of surface tension?

Question 20.

What is the pressure on a swimmer 15 m below the surface of a lake?

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