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Surface tension-Basic

Dear Readers,

Compared to other sections, Physics is considered to be the most scoring section. If prepared thoroughly, Physics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. The spherical shape of rain-drop is due to

  •  Density of the liquid
  •  Surface tension
  •  Atmospheric pressure
  •  Gravity

Surface tension

Q2. At which of the following temperatures, the value of surface tension of water is minimum

  •  4°C
  •  25°C
  •  50°C
  •  75°C

75°C

Q3. Force necessary to pull a circular plate of 5cm radius from water surface for which surface tension is 75 dynes/cm, is

  •  30 dynes
  •  60 dynes
  •  750 dynes
  •  750πdynes

750πdynes

Q4. A square frame of side L is dipped in a liquid. On taking it out, a membrane is formed. If the surface tension of the liquid is T, the force acting on the frame will be

  •  2TL
  •  4TL
  •  8TL
  •  10TL

8TL

Q5. Ball pen and fountain pen depend respectively upon the principle of

  •  Surface tension and viscosity
  •  Surface tension and gravity
  •  Gravitation and surface tension
  •  Surface tension and surface tension

Gravitation and surface tension

Q6. A water drop of 0.05cm3 is squeezed between two glass plates and spreads into area of 40cm2. If the surface tension of water is 70 dyne/cm then the normal force required to separate the glass plates from each other will be

  •  90 N
  •  45 N
  •  22.5 N
  •  450 N

45 N

Q7. The main difference between a stretched membrane and the liquid surface is

  •  The liquid surface has a tendency to contract but the stretched membrane does not
  •  The surface tension does not depend on area but on the tension of the stretched membrane does
  •  The surface tension increases with increases in area
  •  Surface tension increases irregularly with temperature

The surface tension does not depend on area but on the tension of the stretched membrane does

Q8. A hollow disc of aluminum whose external and internal radii are R and r respectively, is floating on the surface of a liquid whose surface tension is T. The maximum weight of disc can be

  •  2π (R + r) T
  •   2π (R – r) T
  •  4π (R + r) T
  •   4π (R – r) T

2π (R + r) T



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