132. Tap water is placed in an open pad and allowed to evaporate. After some
   time the temperature of water
   (a) increases to a great extent
   (b) increases slightly
   (c) decreases slightly
   (d) decreases rapidly
Ans: (c)
133. In hot climatic conditions, the buildings are painted white because
   (a) white paint is economical
   (b) it does not fade off
   (c) it does not crack with higher temperature
   (d) white coating is a bad conductor of heat and reflects heat rays that fall on
       it, thus keeping the inside cool
Ans: (d)
134. The evaporation rate depends on
   (a) the nature of the liquid
   (b) area of the exposed surface of the liquid
   (c) temperature of air and of the liquid
   (d) All the above
Ans: (d)
135. The rate of cooling of a hot body depends on
   (a) the nature of the radiating surface
   (b) area of the radiating surface
   (c) temperature difference between the body and the surroundings
   (d) All the above
Ans: (d)
136. When we sweat, we feel comfortable under a fan because
   (a) the air circulated by the fan is cool
   (b) the fan produces convection currents of air
   (c) the air circulated by the fan quickens the evaporation of the moisture on
       our skin
   (d) the air takes away the heat from our body