Physics GK 11 - Surface Tension & Capillarity

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1).
What is the property of a liquid due to which its free surface tries to have minimum surface area?
2).
Which of the following is correct about Surface Tension?
3).
Why a small liquid drop is in spherical shape?
4).
Which of the following factors affect the Surface Tension?
5).
Which is the effect of increase in the temperature on the surface tension of the liquid?
6).
What is the main cause of capillarity?
7).
What is the shape of meniscus when angle of contact is greater than 90°?
8).
Which is correct about the height of a capillary column of a liquid, at a particular temperature, as per Jurin's law?
9).
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?
10).
When will the height of water in capillary tube be minimum?
11).
What will be the general value of angle of contact when the liquid does not wet the solid?
12).
Which of the following is NOT an example of capillary action?
13).
What happens to the liquid in a capillary of insufficient length?
14).
What is the difference of pressure between two sides of the liquid surface called as?
15).
What is the relationship between excess pressure and the radius of the bubble?
16).
Which is the effect of increase in impurities on the surface tension of the liquid?
17).
What is the unit of surface tension in c.g.s system?
18).
Which of the following intermolecular forces enables us to write on the blackboard with a chalk?
19).
What do we call the potential energy of surface molecules per unit area of the surface?
20).
What is the angle of contact for pure water and glass?
1. What is the property of a liquid due to which its free surface tries to have minimum surface area?
[A] Viscosity
[B] Buoyancy
[C] Surface Tension
[D] Rigidity
2. Which of the following is correct about Surface Tension?
[A] It is a scalar quantity
[B] It is a molecular phenomenon
[C] Its root cause is the electromagnetic forces
[D] All of the above
3. Why a small liquid drop is in spherical shape?
[A] due to surface tension
[B] due to low viscosity
[C] due to hydrogen bonding
[D] due to low density
4. Which of the following factors affect the Surface Tension?
[A] Nature of liquid
[B] Area of Surface
[C] Both a and b
[D] None of the above
5. Which is the effect of increase in the temperature on the surface tension of the liquid?
[A] it decreases
[B] it increases
[C] it remains the same
[D] None of the above
6. What is the main cause of capillarity?
[A] difference in weight of fluids
[B] pressure difference
[C] temperature difference
[D] velocity gradient
7. What is the shape of meniscus when angle of contact is greater than 90°?
[A] Concave
[B] Convex
[C] Plane
[D] None of the above
8. Which is correct about the height of a capillary column of a liquid, at a particular temperature, as per Jurin’s law?
[A] equal to the diameter of the tube
[B] directly proportional to the diameter of the tube
[C] inversely proportional to the diameter of the tube
[D] half of the diameter of the tube
9. 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?
[A] height increases
[B] height decreases
[C] Remains same
[D] can decrease or increase
10. When will the height of water in capillary tube be minimum?
[A] When water temperature is 0° C
[B] When water temperature is 4° C
[C] When water temperature is -4° C
[D] None of the above
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