CBSE Class 11 Physics Mechanical Properties of Fluids Quiz 1

1. A number of small drops of mercury coalesce adiabatically to form a single drop. The temperature of drop

A Increases B Is infinite C Remains unchanged D May decrease or increase depending upon size

2. Surface tension of a soap solution is 1.9 × 10^-2N/m. work done in blowing a bubble of 0 cm diameter will be

A 7.6 × 10^-6 p J B 15.2 × 10^-6 p J C 1.9 × 10^-6 p J D 1 × 10^-4 p J

3. Plants get water through the roots because of

A Capillarity B Viscosity C Gravity D Elasticity

4. Choose the wrong statement from the following.

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

5. The height of a liquid in a fine capillary tube

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

6. At critical temperature, the surface tension of a liquid

A Is zero B Is infinity C Is the same as that at any other temperature D Can not be determined

7. A capillary tube when immersed vertically in a liquid records a rise of 3 cm. if the tube is immersed in the liquid at an angle of 60° with the vertical, then length of the liquid column along the tube will be

A 2 cm B 3 cm C 6 cm D 9 cm

8. When the angle of contact between a solid and a liquid is 90°, then

A Cohesive force > Adhesive force B Cohesive force < Adhesive force C Cohesive force = Adhesive force D Cohesive force >> Adhesive force

9. Water rises up to a height of 5 cm in a capillary tube of radius 2 mm. what is the radius of the radius of the capillary tube if the water rises up to a height of 10 cm in another capillary?

A 4 mm B 1 mm C 3 mm D 1 cm

10. If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is

A Acute angle B Obtuse angle C 90° D 0°