How does the oil rise up along the wick made of cotton cloth in lamps?

Soap decreases the surface tension of water. How does the decrease in surface tension benefit washing of clothes?

A 10kW drilling machine is used to drill a bore in a small aluminium block of mass 8.0kg .How much is the rise in temperature of the block in 2.5 minutes ,assuming 50% of power is used up in heating the machine itself or lost to the surroundings?Specific heat of aluminium= 0.19Jg^(-1)K^(-1)

How does an arc lamp help in rescue operations ?

A girl dips a thin capillary tube in water. Water rises through it. How does this rise vary with the diameter of the tube?