State whether this is due to evaporation or condensation:
The blackboard dries up after wiping it.

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Solution

The blackboard absorbs heat from the environment after wiping and causing water droplets on the board to evaporate.
The process of conversion of water droplets into water vapor is called evaporation.
Evaporation is a surface phenomenon where the water droplets which are in direct contact with air change into a gaseous state.
Hence, the blackboard dries up after wiping it due to evaporation.

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Question 2 (d)

State for the following whether it is due to evaporation or condensation:
Blackboard dries up after wiping it.

State for each of the following whether it is due to evaporation or condensation :
(a) Water drops appear on the outer surface of a glass containing cold water.
(b) Steam rising from wet clothes while they are ironed.
(c) Fog appearing on a cold winter morning.
(d) Blackboard dries up after wiping it.
(e) Steam rising from a hot girdle when water is sprinkled on it.

Question 2 (c)

State for the following whether it is due to evaporation or condensation:
Fog appearing on a cold winter morning.

Q. Blackboard becomes wet after wiping it with a wet cloth. The board then dries up after some time due to evaporation.

State for each of the following whether it is due to evaporation or condensation:

(a) Water drops appear on the outer surface of a glass containing cold water.

(b) Steam rising from wet clothes while they are ironed.

(d) Blackboard dries up after wiping it.

(e) Steam rising from a hot girdle when water is sprinkled on it.

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State whether this is due to evaporation or condensation: The blackboard dries up after wiping it.

State whether this is due to evaporation or condensation:
The blackboard dries up after wiping it.