Surface Tension MCQ Questions and Answers for Practice

1. A liquid does not wet the surface of a solid if the angle of contact is

1. Zero
2. An acute one
3. 45 degree
4. An obtuse one

2. By which phenomenon does the water rise from roots to leaves of plants

1. Capillary action
2. Surface Tension
3. Bernoullis Theorem
4. Viscosity

3. Excess pressure inside a bubble of radius r and of a liquid of surface tension T is

1. T/r
2. 2T/r
3. 3T/r
4. 4T/r

4. For a liquid which is rising in a capillary, he angle of contact is

1. Obtuse
2. Acute
3. 180 degree
4. 90 degree

5. For a water does not wet a glass rod, the angle of contact is

1. Obtuse
2. Acute
3. 0 degree
4. 90 degree

6. If drops and bubbles do not collapse under the effect of gravity, it indicates that

1. pressure inside the drop is greater than outside
2. pressure inside the drop is lower than outside it
3. Surface tension is low
4. Viscosity is large

7. In case of water and glass, we get a concave meniscus because the adhesive force between water and glass are ...........than the cohesive forces between water molecules.

1. Weaker
2. Stronger
3. Same
4. None of the mentioned

8. In flow field, point exist at surface of object where fluid is brought to rest by object is called

1. field point
2. surface point
3. stagnation point
4. object point

9. Meniscus of mercury in capillary is

1. Concave
2. Convex
3. Plane
4. Cylindrical

10. On increasing the temperature, the kinetic energy of the liquid molecules

1. Increases
2. Decreases
3. Remains constant
4. None of the mentioned

11. On increasing the temperature, the surface tension of the liquid

1. Increases
2. Decreases
3. Remains constant
4. None of the mentioned

12. Potential energy of a molecule on the surface of a liquid is as compare to another molecule inside of the liquid is

1. More
2. Less
3. Both a and b
4. None of these

13. Rain drops are spherical because of

1. Gravitational force
2. Surface tension
3. Air resistance
4. Low viscosity of water

14. Select the incorrect statement from the following option.

1. In case of mercury and glass, we observe a convex meniscus
2. Surface tension is responsible for the rise and fall of the capillary tubes
3. If two drops encounter each other, they tend to repel each other
4. All of the mentioned

15. Shapes of drops of liquid are spherical because of

1. Viscosity
2. Conductivity
3. Absorption
4. Surface tension