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Physical Chemistry -- Liquid State
6.
A soap bubble of radius r is filled with air until the radius is doubled. If
the surface tension of the soap solution is S, the work done in the process
is
- A.16πr2S
- B.4πr2S
- C.24πr2S
- D.12πr2S
- Answer
- Report
Answer : [C]
7.
What is the excess pressure inside a spherical soap bubble of radius 5 cm
if the surface tension of the soap film is 3.5 x 10-2 N m -1?
- A.2.8 Pa
- B.1.4 Pa
- C.5.6 Pa
- D.11.2 Pa
- Answer
- Report
Answer : [A]
8.
Which of the following will happen when two soap bubbles of radius r1
and r2 (r2 > r1) are connected by a piece of tubing?
- A.Both bubbles will collapse.
- B.The bubbles will change in size.
- C.The bubbles will not change in size.
- D.The angle of contact will decrease.
- Answer
- Report
Answer : [B]
9.
When soap is added to water,
- A.the angle of contact will increase
- B.the surface tension of water will increase
- C.the angle of contact will decrease
- D.nothing will happen
- Answer
- Report
Answer : [C]
10.
The radius of a soap bubble is 5 cm. The surface tension of the soap film
is 3.5 x 10 -2 N m -1. What is the work done in blowing the bubble?
- A.4.4 x 10-2 J
- B.1.1 x 10-2 J
- C.1.1 x 10-3 J
- D.2.2 x 10-2 J
- Answer
- Report
Answer : [D]
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