Surface Tension MCQs Quiz Multiple Choice Questions & Answers

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

16. Stalagmometer is cleaned to remove grease with the help of

1. Chromic acid
2. Sulphuric acid
3. Distilled water
4. Tartaric acid

17. Surface tension of liquid is independent of the

1. Temperature of the liquid
2. Area of the liquid surface
3. Nature of the liquid
4. Impurities present in the liquid

18. The angle of contact for liquid on a solid surface is the angle between:

1. the tangent to the liquid surface at the point of contact and the solid surface
2. the tangent to the solid surface at the point of contact and the liquid surface
3. the liquid surface and the solid surface at the point of contact
4. none of the above.

19. The apparatus used for the determination of surface tension of a liquid is

1. Oedometer
2. Stalagmometer
3. Consolidometer
4. None of the mentioned

20. The pressure just below the meniscus of water

1. Is greater than just above it
2. Is less than just above it
3. Is same as just above it
4. Is always equal to atmospheric pressure.

21. The surface tension of a liquid is T. the increase in its surface energy on increasing the surface area by A is

1. AT^-1
2. AT
3. A²T
4. A²T²

22. The surface tension of water at 250C is

1. 90.0 dynes/cm
2. 45.63 dynes/cm
3. 82.5 dynes/cm
4. 72.14 dynes/cm

23. The unit of surface tension in the CGS system is

1. N/m
2. Kg/cm
3. Dynes/cm
4. Dynes/m

24. What is the main cause of capillarity?

1. difference in weight of fluids
2. pressure difference
3. temperature difference
4. velocity gradient

25. What is the property of a liquid due to which its free surface tries to have minimum surface area?

1. Viscosity
2. Buoyancy
3. Surface Tension
4. Rigidity

26. What is the shape of meniscus when angle of contact is greater than 90 degree?

1. Concave
2. Convex
3. Plane
4. None of the above

27. What will be the change in the height of water in a capillary tube in stationary condition on earth if the same tube is taken in a lift going downward with acceleration?

1. height increases
2. height decreases
3. Remains same
4. can decrease or increase

28. When impurity is added to a liquid, its surface tension

1. decreases
2. first decreases and then
3. increases increases
4. remains same

29. When will the height of water in capillary tube be minimum?

1. When water temperature is 0 degree C
2. When water temperature is 4 degree C
3. When water temperature is -4 degree C
4. None of the above

30. Which is correct about the height of a capillary column of a liquid, at a particular temperature, as per Jurin’s law?

1. equal to the diameter of the tube
2. directly proportional to the diameter of the tube
3. inversely proportional to the diameter of the tube
4. half of the diameter of the tube

31. Which is the effect of increase in the temperature on the surface tension of the liquid?

1. it decreases
2. it increases
3. it remains the same
4. None of the above

32. Which of the following factors affect the Surface Tension?

1. Nature of liquid
2. Area of Surface
3. Both a and b
4. None of the above

33. Which of the following is an application of surface tension?

1. Use of soaps and detergents as cleansing agents
2. Molecular structure can be elucidated by surface tension measurements through parachor values
3. Surfactants are incorporated in preparations like toothpaste
4. All of the mentioned

34. Which of the following is correct about Surface Tension?

1. It is a scalar quantity
2. It is a molecular phenomenon
3. Its root cause is the electromagnetic forces
4. All of the above

35. Why a small liquid drop is in spherical shape?

1. due to surface tension
2. due to low viscosity
3. due to hydrogen bonding
4. due to low density