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Mechanical Properties of Fluids · Question 28

NEET 2013MCQEasy📈 Topic in 12% papers+4−1
1

The wettability of a surface by a liquid depends primarily on

  1. density
  2. angle of contact between the surface and the liquid
  3. viscosity
  4. surface tension

Answer

(2) angle of contact between the surface and the liquid

Solution

As per NCERT, when the angle of contact is acute ( < 90 ) the liquid spreads on and wets the surface (water on glass), and when is obtuse ( > 90 ) it forms drops and does not wet it (mercury on glass).

wettability depends primarily on the angle of contact between the surface and the liquid.

Answer: (2)

NEET 2013

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2

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?

  1. The velocity is maximum at the narrowest part of the pipe and pressure is maximum at the widest part of the pipe.
  2. Velocity and pressure both are maximum at the narrowest part of the pipe.
  3. Velocity and pressure both are maximum at the widest part of the pipe.
  4. The velocity is minimum at the narrowest part of the pipe and the pressure is minimum at the widest part of the pipe.
NEET 2013 (Karnataka)

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