Dew Point

Q. Which among these statements are correct?

1. Dew point is the temperature at which air is saturated with water vapour.

2. Calorimeter is used to measure the amount of mass transferred​.

3. Condensation is a process in which water vapour changes into water.
4. Relative humidity depends on temperature and the pressure of the system

Q. The temperature and the dew point in an open room are $20{}^{\circ }C$ and $10{}^{\circ }C$. If the room temperature drops to $15{}^{\circ }C$, what will be the new dew point?

1. ${11}^{\circ }C$
2. ${10}^{\circ }C$
3. ${15}^{\circ }C$
4. ${20}^{\circ }C$

Q. The process in which water vapour changes into water is called

1. Evaporation
2. Melting
3. Condensation
4. Sublimation

Q. The weather report reads,
“Temperature: $20{}^{\circ }C$,
Relative humidity: $100\%$”.
What is the dew point?

1. Less than ${20}^{\circ }C$
2. Can’t be said.
3. More than ${20}^{\circ }C$
4. ${20}^{\circ }C$

Q. The relative humidity at dew point is

1. 0%
2. 25%
3. 100%
4. 50%

Q. Dew drops are formed in winters on glass panes of car due to condensation of water vapour.

1. False
2. True