# PHYSICS : REVISION TEST ON TOPICS OF CLASS XI ---V

Oil spreads over the surface of water whereas water does not spread over the surface of the oil, due to ____.
Surface tension of water is very high
Surface tension of water is very low
Viscosity of oil is high
Viscosity of water is high
The property utilized in the manufacture of lead shots is ____.
Excess pressure of one soap bubble is four times more than the other. Then the ratio of volume of first bubble to another one is _____.
1 : 64
1 : 4
64 : 1
1 : 2
There are two liquid drops of different radii. The excess pressure inside over the outside is _____.
More in the big drop
More in the small drop
Equal in both drops
There is no excess pressure inside the drops
If the radius of a soap bubble is four times that of another, then the ratio of their pressures will be _____.
1 : 4
4 : 1
16 : 1
1 : 16
In capillary pressure below the curved surface of water will be _____.
Equal to atmospheric
Equal to upper side pressure
More than upper side pressure
Lesser than upper side pressure
/
4 cm
20 cm
5 cm
4.5 cm
Two bubbles A and B  are joined through a narrow tube. Then _____.
The size of A will increase
The size of B will increase
The size of B will increase until the pressure equals
None of the above
If the excess pressure inside a soap bubble is balanced by oil column of height 2 mm, then the surface tension of soap solution will be (r = 1 cm and density d = 0.8 gm/cc) _____.
3.9 N/m
3.9 ×10–2 N/m
3.9 ×10–3 N/m
3.9 dyne/m
The excess pressure in a soap bubble is thrice that in other one. Then the ratio of their volume is _____.
1 : 3
1 : 9
27 : 1
1 : 27
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TOPIC: SURFACE TENSION

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Kajal Sengupta
Physics teacher of 9th to 12 th grade,A, AS level
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