• #### 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

• 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

• 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

• 4 mm
• 1 mm
• 3 mm
• 1 cm

• Acute angle
• Obtuse angle
• 90°
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