Question

A glass filled with ice cubes was placed on a table. After a while, water droplets appeared on the glass surface.

Which of these sentences is/ are TRUE?
i) This phenomenon is known as condensation.
ii) This proves that water vapour is present in the air.
iii) This is also observed when a hot object vapour 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.

When water vapour in the air comes into contact with something cool, such as the outside of a glass filled with ice cubes, its molecules slow down and get closer together. When that happens, the gaseous water vapour turns back into liquid water droplets. That's condensation.