Medium
State whether the following statements are True or False:
$(i)$ If the weight of a body is greater than the buoyant force of the liquid,the body floats on the surface of the liquid.
$(ii)$ The velocity of water at the bottom of a river is always slower than at the surface.
$(iii)$ The angle of contact increases with an increase in the temperature of the liquid.
$(i)$ If the weight of a body is greater than the buoyant force of the liquid,the body floats on the surface of the liquid.
$(ii)$ The velocity of water at the bottom of a river is always slower than at the surface.
$(iii)$ The angle of contact increases with an increase in the temperature of the liquid.
(N/A) $(i)$ False. If the weight of the body is greater than the buoyant force,the body will sink in the liquid.
$(ii)$ True. Due to the viscosity of water and the friction between the water and the riverbed,the velocity of water is lowest at the bottom and highest near the surface.
$(iii)$ False. The angle of contact generally decreases as the temperature of the liquid increases because the surface tension of the liquid decreases with an increase in temperature.
$(ii)$ True. Due to the viscosity of water and the friction between the water and the riverbed,the velocity of water is lowest at the bottom and highest near the surface.
$(iii)$ False. The angle of contact generally decreases as the temperature of the liquid increases because the surface tension of the liquid decreases with an increase in temperature.
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Match column-$I$ with column-$II$.
Column-$I$ Column-$II$ $(A)$ Hydraulic lift $(P)$ Archimedes' principle $(B)$ Razor blade can be made to float on the surface of water $(Q)$ Pascal's law $(C)$ The dam of a reservoir is made thick at the bottom $(R)$ Surface tension $(D)$ Ship is floating on the ocean $(S)$ Pressure
| Column-$I$ | Column-$II$ |
|---|---|
| $(A)$ Hydraulic lift | $(P)$ Archimedes' principle |
| $(B)$ Razor blade can be made to float on the surface of water | $(Q)$ Pascal's law |
| $(C)$ The dam of a reservoir is made thick at the bottom | $(R)$ Surface tension |
| $(D)$ Ship is floating on the ocean | $(S)$ Pressure |
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