MCQ Surface Tension and Capillarity, Class 11 Physics

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

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

the tangent to the liquid surface at the point of contact and the solid surface

the tangent to the solid surface at the point of contact and the liquid surface

the liquid surface and the solid surface at the point of contact

none of the above.

Question 1 of 10

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

decreases

first decreases and then increases

increases

remains same

Question 2 of 10

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

pressure inside the drop is greater than outside

pressure inside the drop is lower than outside it

Surface tension is low

Viscosity is large

Question 3 of 10

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

Capillary action

Surface Tension

Bernoulli's Theorem

Viscosity

Question 4 of 10

5. When a capillary tube of radius r is dipped in a liquid of density ρ and surface tension S, the liquid rises or falls through a distance

A

B

C

D

Question 5 of 10

6. The excess pressure inside an air bubble is

A

B

C

D

Question 6 of 10

7. SI unit of surface tension is

N.m²

N.m

N/m

N/m²

Question 7 of 10

8. When an air bubble of radius R lies at a depth h below the free surface of a liquid of density ρ and surface tension S_la, then the excess pressure inside the bubble will be

A

B

C

D

Question 8 of 10

9. Water rises to a height of 20 mm in a capillary. If the radius of the capillary is made 1/3 rd of its previous value, to what height will the water now rise in the tube?

60 mm

80 mm

40 mm

30 mm

Question 9 of 10

10. The excess pressure inside a soap bubble is (Here, S_la is the surface tension between the liquid-air interface).

A

B

C

D

Question 10 of 10

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