1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

The surface tension of a liquid at its boiling point

A
becomes zero
B
becomes infinity
C
is equal to the value at room temperature
D
is half of the value at room temperature
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A ball floats on the surface of water in a container exposed to the atmosphere. When the container is covered and the air is partially removed, then the ball

A
rises
B
gets immersed more in water
C
remains immersed at its former depth
D
may rise or sink
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A frame made of metallic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metallic wire is reduced by 50%, then the energy of the soap film will be changed by

A
100%
B
75%
C
50%
D
25%
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A fluid is in streamline flow across a horizontal pipe of variable area of cross-section. For this which of the following statements is correct?

A
Velocity of fluid is maximum at narrowest part.
B
Pressure of the fluid is maximum at widest part.
C
Both (a) and (b)
D
Neither (a) nor (b)
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