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# Test: Surface Tension & Capillarity

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## 10 Questions MCQ Test Physics Class 11 | Test: Surface Tension & Capillarity

Test: Surface Tension & Capillarity for NEET 2023 is part of Physics Class 11 preparation. The Test: Surface Tension & Capillarity questions and answers have been prepared according to the NEET exam syllabus.The Test: Surface Tension & Capillarity MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Surface Tension & Capillarity below.
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Test: Surface Tension & Capillarity - Question 1

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

Detailed Solution for Test: Surface Tension & Capillarity - Question 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. This is the definition of angle of contact.

Test: Surface Tension & Capillarity - Question 2

### When impurity is added to a liquid, its surface tension

Detailed Solution for Test: Surface Tension & Capillarity - Question 2

When impurities are mixed in liquid, the surface tension of liquid decreases. The soluble substances when dissolved in water, decreases the surface tension of water.

Test: Surface Tension & Capillarity - Question 3

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

Detailed Solution for Test: Surface Tension & Capillarity - Question 3

If drops and bubbles do not collapse under the effect of gravity, it indicates that the pressure inside the drop is greater than the pressure outside. The greater inner pressure prevents the drop from collapsing.

Test: Surface Tension & Capillarity - Question 4

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

Detailed Solution for Test: Surface Tension & Capillarity - Question 4

Plants use capillary action to bring water from the soil up through capillaries, small tubes in the plants, to the rest of the plant. Due to gravity, capillary action is not strong enough for the water to travel to the top of the plant. Another process, transpiration pull does the rest of the work.

Test: Surface Tension & Capillarity - Question 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

Test: Surface Tension & Capillarity - Question 6

The excess pressure inside an air bubble is

Test: Surface Tension & Capillarity - Question 7

SI unit of surface tension is

Detailed Solution for Test: Surface Tension & Capillarity - Question 7

Surface tension is defined as the ratio of surface force applied on a liquid to the length along which the force acts. so it is newton/meter

Test: Surface Tension & Capillarity - Question 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 Sla, then the excess pressure inside the bubble will be

Detailed Solution for Test: Surface Tension & Capillarity - Question 8

Excess pressure inside a cavity or air bubble in liquid formula
P[excess] = P[inside] - P [outside]
P [outside]  =P[atm]
P[inside]= P[atm] +hpg [here p represents density] +2T/R
P[excess] = P[atm] +hpg [here p represents density] +2T/R-P[atm]
P[excess] = hpg+2T/R
Now substitute value for T
P[excess] = hpg+2S/R
Hence C is correct.

Test: Surface Tension & Capillarity - Question 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?

Detailed Solution for Test: Surface Tension & Capillarity - Question 9

Test: Surface Tension & Capillarity - Question 10

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

Detailed Solution for Test: Surface Tension & Capillarity - Question 10

Excess pressure in water bubble = 2T/r (due to 1 surface only)
Excess pressure in a soap bubble = 4T/r (due to 2 surfaces)

## Physics Class 11

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## Physics Class 11

124 videos|464 docs|210 tests

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