MCQs on Surface Tension

MCQs on Surface Tension

Q1: When there are no external forces, the shape of a liquid drop is determined by

1. Surface Tension of the liquid
2. The density of the liquid
3. The viscosity of the liquid
4. The temperature of air only

Answer: (a) Surface Tension of the liquid

Q2: If T is the surface tension of the soap solution, the amount of work done in blowing a soap bubble from diameter D to a diameter 2D is

1. 2πD²T
2. 4πD²T
3. 6πD²T
4. 8πD²T

Answer: (c) 6πD²T

Q3: If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of the container is

1. Acute angle
2. Obtuse angle
3. 90⁰
4. 0⁰

Answer: (d) 0⁰

Q4: Raindrops are spherical in shape because of

1. Capillary
2. Surface Tension
3. Downward motion
4. Acceleration due to gravity

Answer: (b)Surface Tension

Q5: In a surface tension experiment with a capillary tube, the water rises up to 0.1m. If the same experiment is repeated on an artificial satellite which is revolving around the earth. The rise of water in a capillary tube is

1. 0.1 m
2. 9.8 m
3. 0.98 m
4. Full length of the capillary tube

Answer: (d) Full length of the capillary tube

Q6: At the critical temperature, the surface tension of the liquid

1. Is zero
2. Is infinity
3. Is the same as that at the other temperature
4. Cannot be determined

Answer: (a) Is zero

Q7: The surface of the water in contact with the glass wall is

1. Plane
2. Concave
3. Convex
4. Both a and b

Answer: (b) Concave

Q8: When a soap bubble is charged

1. It contracts
2. It expands
3. It does not undergo any change in size
4. None of these

Answer: (b) It expands

Q9: If common salt is dissolved in water, then the surface tension of saltwater is

1. Increased
2. Decreased
3. Not changed
4. First increases then decrease

Answer: (a) Increased

Q10: A drop of oil is placed on the surface of the water. Which of the following statements is correct?

1. It will remain on it as a sphere
2. It will spread as a thin layer
3. It will partly be as spherical droplets and partly as thin films
4. It will float at the distorted drop on the water surface.

Answer: (b) It will spread as a thin layer