Question

A glass filled with ice cubes is kept on a table. After sometime water drops were observed sticking to the outside of the glass. Which of these sentences is TRUE of this phenomenon?
i) This phenomenon is known as condensation
ii) This proves that water vapour is present in air
iii) This is also observed when a hot object is cooled in the open.

• A. Only (i) and (ii)
• B. Only (ii) and (iii)
• C. Only (i) and (iii)
• D. (i), (ii) and (iii)

Answer 1

The correct option is A Only (i) and (ii)

Statements (i) and (ii) are true of the given phenomenon.
Condensation is the phase change from gas to liquid.
The water vapour molecules present in the air lose their energy and get condensed, when they come in contact with the surface of glass. When they get condensed, they appear as water droplets.