CBSE Class 4 Science Evaporation Worksheet Set 01

Question 1. The following are some processes involving water. Choose and circle the correct word, condensation or evaporation, for each.
a) Water droplets forming on a cold glass
(a) Evaporation
(b) Condensation
Answer: (b) Condensation
Water vapor in the air touches the cold surface of the glass, loses heat, and turns back into liquid water droplets.
In simple words: Gas turning into liquid on a cold surface is called condensation.

Exam Tip: Remember that condensation occurs when warm water vapor cools down.

b) Vapour rising from a pan of boiling water
(a) evaporation
(b) condensation
Answer: (a) evaporation
Heat from boiling water causes liquid water to turn into water vapor and rise into the air.
In simple words: Liquid changing into gas/vapor when heated is evaporation.

Exam Tip: Evaporation happens faster when heat is added.

c) Coffee drying at the bottom of a cup
(a) evaporation
(b) condensation
Answer: (a) evaporation
The liquid coffee slowly changes into vapor and mixes with the air over time, leaving the cup dry.
In simple words: Liquid disappearing into the air as vapor is evaporation.

Exam Tip: Drying of wet surfaces is always caused by evaporation.

d) A lake drying during a drought
(a) evaporation
(b) condensation
Answer: (a) evaporation
Heat from the sun causes water from the lake to evaporate continuously into the atmosphere.
In simple words: Large bodies of water dry up because water evaporates into the air.

e) Dew droplets forming on a grass
(a) evaporation
(b) condensation
Answer: (b) condensation
During cold nights, moisture in the air cools down upon touching cold grass blades and turns into liquid water droplets.
In simple words: Water vapor in the air turning into water drops on cold morning grass is condensation.

Exam Tip: Dew formation is a classic example of natural condensation.

f) Formation of clouds
(a) evaporation
(b) condensation
Answer: (b) condensation
Water vapor rises high into the sky, cools down, and condenses into tiny water droplets to form clouds.
In simple words: High up in the sky, water vapor cools and condenses to make clouds.

Exam Tip: Clouds are made of condensed water droplets or ice crystals.

Question 2. Make new compound words related to weather, by choosing the correct words from the box given below.
Box words: cast, spout, shine, fall, pour, storm, set

a) sun + shine = sunshine
Answer: sunshine
Combining sun and shine creates sunshine.
In simple words: Sunshine means the light coming directly from the sun.

Exam Tip: Compound words are formed by joining two separate words to make a new word.

b) down + pour = downpour
Answer: downpour
Combining down and pour creates downpour.
In simple words: A downpour is a heavy fall of rain.

Exam Tip: A downpour indicates very heavy rainfall.

c) hail + storm = hailstorm
Answer: hailstorm
Combining hail and storm creates hailstorm.
In simple words: A hailstorm is a weather event with falling balls of ice.

Exam Tip: Hailstorms bring solid ice pellets instead of normal raindrops.

d) over + cast = overcast
Answer: overcast
Combining over and cast creates overcast.
In simple words: Overcast means the sky is covered with clouds.

Exam Tip: An overcast sky usually blocks direct sunlight.

e) snow + fall = snowfall
Answer: snowfall
Combining snow and fall creates snowfall.
In simple words: Snowfall is the falling of snow from the sky.

Exam Tip: Snowfall occurs in freezing temperatures.

f) sun + set = sunset
Answer: sunset
Combining sun and set creates sunset.
In simple words: Sunset is the time in the evening when the sun disappears below the horizon.

Exam Tip: Sunset marks the end of daytime.

g) water + spout = waterspout
Answer: waterspout
Combining water and spout creates waterspout.
In simple words: A waterspout is a spinning column of air and mist over a body of water.

Exam Tip: Waterspouts resemble tornadoes that form over water surfaces.