Dew Point and Humidity

Q. You must have seen that water vapour starts to condense in an air conditioner. Why?

1. The AC is leaking, call a mechanic.
2. The temperature at the AC is lesser than the dew point temperature.
3. The temperature at the AC is more than the dew point temperature.
4. It is so hot outside, I don't even wanna be reminded of ACs

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

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

Q. In some areas, people sweat a lot because the relative humidity is higher as compared to other areas.

1. True
2. False

Q. A glass contains some water at room temperature ${20}^{\circ }C$. Refrigerated water is added to it slowly. When the temperature of the glass reaches ${10}^{\circ }C$, small droplets condense on the outer surface. Calculate the relative humidity in the room. The boiling point of water at a pressure of 17.5 mm of mercury is ${20}^{\circ }C$ and at 8.9 mm of mercury it is ${10}^{\circ }C$.

1. $60\%$
2. $75\%$
3. $51\%$
4. $35\%$