Home › Maharashtra SSC (Class 10) › Physics › Heat › Which statement correctly defines the dew point …
Which statement correctly defines the dew point temperature of a sample of air?
AThe temperature at which the air becomes saturated with vapour
BThe temperature at which the air is fully unsaturated
CThe temperature at which the air boils into vapour
DThe temperature at which the air reaches 0 °C
Answer & Solution
Correct answer: A. The temperature at which the air becomes saturated with vapour
1. As unsaturated air is cooled, it can hold less vapour.
2. At a certain temperature it becomes saturated; this is the dew point.
3. The relative humidity at the dew point is 100%, not unsaturated, ruling out option B.
4. Dew point has nothing to do with boiling or a fixed 0 °C value.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.75_
Related questions
A calorimeter of mass 100 g (specific heat 0.1 cal/g °C) contains 250 g of liquid at 30 °CTo convert 2 kg of water at 20 °C into ice at 0 °C, liquid ammonia is evaporated. Given spA thermally insulated pot holds 150 g of ice at 0 °C. How much steam at 100 °C must be add80 g of steam at 97 °C is released onto an ice slab at 0 °C. Using L(vap) = 540 cal/g, speA copper sphere of mass 100 g at 100 °C is dropped into 195 g of water at 20 °C held in a Going by the calorie definition, the heat needed to raise the temperature of 1 kg of waterIn Hope's apparatus, when water is cooled by the freezing mixture, the lower thermometer THow much heat must be supplied to convert 10 g of ice at 0 °C into water at 50 °C? (Latent