CBSE  /  Class 11  /  Physics  /  Mechanical Properties of Fluids

  • 1. 
    A number of small drops of mercury coalesce adiabatically to form a single drop. The temperature of drop

  • Increases
  • Is infinite
  • Remains unchanged
  • May decrease or increase depending upon size

  • 2. 
    Surface tension of a soap solution is 1.9 × 10-2N/m. work done in blowing a bubble of 0 cm diameter will be

  • 7.6 × 10-6 p J
  • 15.2 × 10-6 p J
  • 1.9 × 10-6 p J
  • 1 × 10-4 p J

  • 3. 
    Plants get water through the roots because of

  • Capillarity
  • Viscosity
  • Gravity
  • Elasticity

  • 4. 
    Choose the wrong statement from the following.

  • Small droplets of a liquid are spherical due to surface tension
  • Oil rises through the wick due to capillarity
  • In drinking the cold drinks through a straw, we use the phenomenon of capillarity
  • Gum is used to stick two surfaces. In this process we use the property of Adhesion

  • 5. 
    The height of a liquid in a fine capillary tube

  • Increases with an increase in the density of a liquid
  • Decreases with a decrease in the diameter of the tube
  • Decreases with an increase in the surface tension
  • Increases as the effective value of acceleration due to gravity is decreased

  • 6. 
    At critical temperature, the surface tension of a liquid

  • Is zero
  • Is infinity
  • Is the same as that at any other temperature
  • Can not be determined

  • 7. 
    A capillary tube when immersed vertically in a liquid records a rise of 3 cm. if the tube is immersed in the liquid at an angle of 60° with the vertical, then length of the liquid column along the tube will be

  • 2 cm
  • 3 cm
  • 6 cm
  • 9 cm

  • 8. 
    When the angle of contact between a solid and a liquid is 90°, then

  • Cohesive force > Adhesive force
  • Cohesive force < Adhesive force
  • Cohesive force = Adhesive force
  • Cohesive force >> Adhesive force

  • 9. 
    Water rises up to a height of 5 cm in a capillary tube of radius 2 mm. what is the radius of the radius of the capillary tube if the water rises up to a height of 10 cm in another capillary?

  • 4 mm
  • 1 mm
  • 3 mm
  • 1 cm

  • 10. 
    If the surface of a liquid is plane, then the angle of contact of the liquid with the walls of container is

  • Acute angle
  • Obtuse angle
  • 90°
  • 0°
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