Physics GK 11 - Surface Tension & Capillarity

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

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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

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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

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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

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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

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6. What is the main cause of capillarity?
[A] difference in weight of fluids
[B] pressure difference
[C] temperature difference
[D] velocity gradient

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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

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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

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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

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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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