Surface Tension Questions And Answers

Surface Tension Questions And Answers

The viva questions and answers related to surface tension and viscosity are important for students of class 12th physics.

Surface tension questions and answers are short questions (also MCQs) which are an important part of class 12th physics curriculum. They are also useful viva voce questions for practice. The multiple choice questions MCQ on surface tension and viscosity are as below:

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01. What is the (α) in the term {T = T0 (1 – αt)}?

02. Towel soaks water is due to the phenomenon of ___________

03. The surface tension of urine is used to diagnose _________ in pathological tests

04. Surface Tension: Liquid surface behaves as a stretched ________________

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05. The Surface Tensions of Mercury at 20°C is __________ N/m

06. Surface Tension of a liquid is _____ at its Boiling Point

07. Ink rises in pen is an examples of ___________

08. Attraction between molecules of the same substance is called _______

09. The Surface Tensions of Alcohol at 20°C is __________ dyne/cm

10. The force of attraction between two molecules of different substances is called ________

Surface Tension Questions And Answers
Capillarity

11. Liquid has a tendency to have _______ Potential Energy

12. An imaginary sphere having a molecule at its center and range of molecular attraction as its radius is called _________ of that molecule

13. For a given solid-liquid pair, at a given temperature angle of contact is __________

14. The ______ energy per unit area of the liquid surface is known as surface energy.

15. The rise and fall of a liquid in a thing capillarity tube is governed by _______ Law

16. Liquid drop tends to take spherical shape because __________

17. Soap dissolved in water _________ surface tension. That is why soaps are used for washing.

18. When an impurity is weakly soluble the surface tension ____________

19. The Angle of Contact depends on ________
(a) Nature of liquid & solid
(b) Medium which exist above free surface
(c) Added impurity and Change in temperature
(d) All of above

20. The temperature at which the Surface Tension of a liquid is zero is _____________

Surface Tension Questions And Answers
Physical Property – Surface Tension

21. Liquid Surface has a tendency to contract its free surface to occupy ________ area

22. Why is Hot Soup more tastier than cold soup?

23. A drop of mercury of radius 5mm is broken into 64 equal sized droplets. What is the Work Done? [Surface Tension of Mercury is 540 dyne/cm]

24. Why does surface tension decreases when temperature is increased?

25. What are the exceptions to the rule that Surface Tension lowers as temperature rises?

26. A liquid rises to a height of 6 cm in a glass tube of radius 0.03cm. What will be the height of liquid column in a glass capillary tube of radius 0.02 cm?

27. Greased steel needle floats on water, if gently placed, even though its density is much more than water is an example of _______________

28. A liquid rises to a height of 5 cm in a glass tube of radius 0.01cm. What will be the height of liquid column in a glass capillary tube of radius 0.04 cm?

29. What is Capillarity?

30. The Surface Tensions of Soap Solution at 20°C is __________ dyne/cm

31. What are the differences between surface tension and viscosity?

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Answers: Surface Tension Questions And Answers

01. Temperature Coefficient of Surface Tension
02. Capillarity
03. Jaundice
04. elastic membrane
05. 0.4355
06. Zero
07. Capillarity
08. Cohesion
09. 21
10. Adhesive Force
11. Minimum
12. Sphere of Influence
13. constant
14. Potential
15. Jurin’s Law
16. in which area is minimum
17. Decreases
18. decreases
19. (d) All of above
20. Critical Temperature of that liquid
21. Minimum
22. The Surface Tension of hot soup is less than that of cold soup. So hot soup spread over a larger area of tongue and therefore more tastier.
23. 0.0005089 J {Formula}
24. When temperature is increased, the distance between molecules increases; cohesive forces decreases; surface energy decreases and therefore surface tension decreases
25. molten copper and cadmium.
26. 9 cm
27. Surface Tension
28. 1.25 cm
29. When capillary tube is dipped in water, water rises in the tube. When dipped in mercury, level falls. This rise or fall of level in tube is called capillarity
30. 25
31. Viscosity is due to motion of molecules, whereas surface tension is due to the unbalanced inter-molecular forces. Second difference is that viscosity is present only in moving fluids, whereas surface tension is observed in both moving and stationary fluids.

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