Online Test — A Journey through States of Water
15 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 15
Water exists in how many states?
One
Two
Three
Four
Explanation: Water exists as solid (ice), liquid (water) and gas (water vapour).
Question 2 of 15
The change of water into vapour at its surface, without boiling, is:
Condensation
Evaporation
Freezing
Melting
Explanation: Evaporation is the slow change of a liquid into vapour at the surface.
Question 3 of 15
Evaporation becomes faster when the weather is:
Cold and still
Hot and windy
Cloudy and damp
Rainy
Explanation: Heat and wind speed up evaporation.
Question 4 of 15
The change of vapour back into liquid water on cooling is:
Evaporation
Condensation
Boiling
Transpiration
Explanation: Condensation is vapour turning into liquid on cooling.
Question 5 of 15
Dew on grass in the early morning forms by:
Evaporation
Condensation
Melting
Freezing
Explanation: Cool air condenses water vapour into dew drops.
Question 6 of 15
When salty sea water evaporates, the salt:
Rises as vapour
Is left behind
Disappears forever
Becomes rain
Explanation: Only water evaporates; the salt is left behind, so the vapour is pure.
Question 7 of 15
The constant movement of water between sea, air and land is the:
Rock cycle
Water cycle
Food chain
Life cycle
Explanation: This never-ending journey of water is the water cycle.
Question 8 of 15
What drives the water cycle?
The Moon
The Sun's heat
The wind only
The soil
Explanation: The Sun's heat evaporates water and powers the cycle.
Question 9 of 15
The release of water vapour from the leaves of plants is called:
Transpiration
Respiration
Condensation
Precipitation
Explanation: Plants release water vapour through their leaves by transpiration.
Question 10 of 15
Clouds are formed by the process of:
Evaporation
Condensation
Collection
Melting
Explanation: Vapour cools and condenses into droplets that form clouds.
Question 11 of 15
Rain, snow and hail are together called:
Evaporation
Condensation
Precipitation
Transpiration
Explanation: Water falling from clouds is precipitation.
Question 12 of 15
Using water carefully so it is not wasted is called water:
Conservation
Pollution
Evaporation
Harvesting only
Explanation: Saving water and not wasting it is water conservation.
Question 13 of 15
Collecting and storing rainwater is known as:
Drip irrigation
Rainwater harvesting
Filtration
Boiling
Explanation: Rainwater harvesting collects and stores rainwater.
Question 14 of 15
Watering crops drop by drop at their roots is called:
Flood irrigation
Drip irrigation
Rainwater harvesting
Sprinkling everywhere
Explanation: Drip irrigation delivers water drop by drop to the roots, saving water.
Question 15 of 15
We must not throw waste into rivers and lakes because it:
Cleans the water
Pollutes the water and harms living things
Makes more rain
Saves water
Explanation: Waste pollutes water, harming people, animals and plants.