Quiz  /  Surface tension Class 12 MCQ Questions With Answers

  • 1. 
    Surface tension is equalto

  • force/area
  • forcex are
  • force/length
  • None of these

  • 2. 
    Viscosity of fluid increases its speed will

  • increases
  • decreases
  • no change
  • All of above

  • 3. 
    Surface tension is the phenomenon happens in

  • liquid
  • solid
  • gas
  • None of these

  • 4. 
    The surface tension of a liquid is T. The increase in its energy on increasing the area of its surface by amount A is

  • TA
  • T2A
  • T
  • T2A2

  • 5. 
    Which of the following graph represents the variation of surface tension with temperature over small temperature ranges for water.

  • A
  • B
  • C
  • D

  • 6. 
    Dimensional formula of surface tension is

  • [MLT].
  • [MT-2].
  • [M0T-2].
  • [ML2T-2].

  • 7. 
    The surface tension of a soap solution is 0.03N/m.The work done to produce a soap bubble of radius 0.05m is

  • 1.6 x 10-3 J
  • 2.6 x 10-3 J
  • 1.6 x 10-6 J
  • 1.88 x 10-3 J

  • 8. 
    The rise in the level of a liquid in a tube is h. What will be the rise in the level if the same amount of liquid is poured into a tube of half the diameter.

  • 0
  • h/2
  • h
  • 2h

  • 9. 
    The force required to seperate two glass plates of area 10-2m2 with a film of water 0.05mm thickness between them is (surface tension of water is 70 x 10-3N/m)

  • 25N
  • 20N
  • 14N
  • 28N

  • 10. 
    The surface tension of liquid decreases with a rise in

  • viscosity of the liquid
  • temperature of the liquid
  • diameter of container
  • thickness of container

  • 11. 
    Calculate the magnitude of capillary effect in millimeters in a glass tube of 7mm diameter, when immersed in mercury. The temperature of the liquid is 25℃ and the values of surface tension of mercury at 25℃ is 0.51 N/m. The angle of contact for mercury is 130°. The density of mercury is 13600kg.m-3.

  • 1.40
  • 2.80
  • 1.70
  • 2.10

  • 12. 
    A square wire frame of size L is dipped in a liquid. On taking out, a ,embrane is formed. If the surface tension of liquid is T, force acting on the entire frame will be

  • 2TL
  • 4TL
  • 8TL
  • 10TL

  • 13. 
    8 mercury drops coalesce to form 1 mercury drop, the energy changes by a factor of

  • 1
  • 2
  • 4
  • 6

  • 14. 
    A soap film is trapped between a frame and a wire of length 10 cm as shown.If the surface tension is given as 0.0049 N/m, what will be the value of m (in mg) such that the wire remains in equilibrium?

  • 0.1 mg
  • 1 mg
  • 10 mg
  • 100 mg

  • 15. 
    The rise in the level of a liquid in a tube is h. If half the amount is poured outside, what will be the new rise in liquid level?

  • 0
  • h/2
  • h
  • 2h

  • 16. 
    The rain drops are in spherical shape due to

  • viscosity
  • thrust on drop
  • surface tension
  • residual pressure

  • 17. 
    The force of attraction between the molecules of the same substance is called as

  • adhesive force
  • force of surface tension
  • cohesive force
  • electrostatic force

  • 18. 
    If a glass tube of 10 mm diameter is immersed in water, what will be the rise or fall in mm in capillary? (Take surface tension = 0.075 N/m, g = 10 m/s2 , ρw =1000 kgm-3 and angle of contact = 0)

  • 0.75
  • 1.5
  • 3
  • 6
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