Water exists in different states – solid, liquid, and gas. It and keeps changing from one form to another in nature. This chapter helps us understand important processes like evaporation, condensation, freezing, and the water cycle. The MCQs below will test your understanding of how water changes states and its role in maintaining balance in our environment.
In this Class 6 Science MCQ, learners will find MCQs, fill-in-the-blanks, and true or false questions along with answers.
Class 6 Science Chapter 8 A Journey through States of Water MCQ with Answers
Question 1: Which of the following is the solid state of water?
a) Steam
b) Ice
c) Water vapour
d) Dew
Answer:
b) Ice — Ice is the solid state of water.
Question 2: The process of changing water into vapour is called?
a) Condensation
b) Evaporation
c) Freezing
d) Melting
Answer:
b) Evaporation — Evaporation is the process of converting water into vapour.
Question 3: When water vapour changes into liquid, the process is called?
a) Freezing
b) Melting
c) Condensation
d) Evaporation
Answer:
c) Condensation — The change of water vapour to liquid is called condensation.
Question 4: Which of the following processes takes place when water is heated?
a) Freezing
b) Evaporation
c) Condensation
d) Solidification
Answer:
b) Evaporation — Heating water converts it into vapour.
Question 5: Clouds in the sky are formed mainly due to?
a) Freezing of snow
b) Condensation of water vapour
c) Melting of ice
d) Solidification of dew
Answer:
b) Condensation of water vapour — Clouds form when water vapour condenses.
Question 6: The process of converting ice into water is called?
a) Melting
b) Freezing
c) Evaporation
d) Condensation
Answer:
a) Melting — Ice changes into water by melting.
Question 7: What is the boiling point of water at normal atmospheric pressure?
a) 0°C
b) 50°C
c) 100°C
d) 212°C
Answer:
c) 100°C — Water boils at 100°C under normal pressure.
Question 8: What is the freezing point of pure water?
a) 0°C
b) 4°C
c) 32°C
d) 100°C
Answer:
a) 0°C — Water freezes at 0°C.
Question 9: When ice is heated, it first changes into?
a) Vapour
b) Dew
c) Water
d) Frost
Answer:
c) Water — Ice first melts to form water.
Question 10: Which of these is the gaseous state of water?
a) Steam
b) Dew
c) Ice
d) Snow
Answer:
a) Steam — Steam is the gaseous state of water.
Question 11: Dew is formed due to?
a) Melting
b) Freezing
c) Condensation
d) Evaporation
Answer:
c) Condensation — Dew is formed when water vapour condenses.
Question 12: The continuous circulation of water in nature is known as?
a) Water purification
b) Water harvesting
c) Water cycle
d) Water flow
Answer:
c) Water cycle — Water circulates through evaporation, condensation, and precipitation.
Question 13: The process of turning vapour into rain is part of the?
a) Water cycle
b) Nitrogen cycle
c) Carbon cycle
d) Oxygen cycle
Answer:
a) Water cycle — Rain is a part of the water cycle.
Question 14: Which of the following increases the rate of evaporation?
a) Low temperature
b) High humidity
c) High wind speed
d) Less surface area
Answer:
c) High wind speed — More wind increases evaporation.
Question 15: Water changing into vapour below boiling point is called?
a) Freezing
b) Melting
c) Evaporation
d) Boiling
Answer:
c) Evaporation — Evaporation occurs even below boiling point.
Question 16: The process opposite to condensation is?
a) Melting
b) Evaporation
c) Freezing
d) Solidification
Answer:
b) Evaporation — Evaporation is the opposite of condensation.
Question 17: Frost is formed when water vapour freezes on?
a) Trees
b) Cold surfaces
c) Water bodies
d) Windows only
Answer:
b) Cold surfaces — Vapour freezes directly on cold surfaces as frost.
Question 18: Which of these processes requires heat energy?
a) Freezing
b) Condensation
c) Evaporation
d) Solidification
Answer:
c) Evaporation — Evaporation requires absorption of heat.
Question 19: Which of these is an example of sublimation?
a) Ice melting
b) Snowfall
c) Dry ice turning into vapour
d) Water boiling
Answer:
c) Dry ice turning into vapour — Dry ice sublimates directly into gas.
Question 20: Water vapour rising in the air forms?
a) Dew
b) Clouds
c) Frost
d) Rainwater
Answer:
b) Clouds — Clouds form from condensed water vapour.
Question 21: Which of these is an example of condensation?
a) Fog on a mirror
b) Boiling water
c) Melting ice
d) Drying clothes
Answer:
a) Fog on a mirror — Water vapour condenses into droplets.
Question 22: Which of the following is NOT a state of water?
a) Liquid
b) Gas
c) Plasma
d) Solid
Answer:
c) Plasma — Plasma is not a state of water.
Question 23: Which form of water is visible in clouds?
a) Water vapour
b) Ice crystals and droplets
c) Pure steam
d) Dew
Answer:
b) Ice crystals and droplets — Clouds are made of tiny droplets and ice crystals.
Question 24: Rain occurs when clouds become?
a) Too light
b) Heavy with water droplets
c) Cold enough to freeze
d) Full of ice only
Answer:
b) Heavy with water droplets — Rain falls when droplets become heavy.
Question 25: The formation of snow is due to?
a) Melting
b) Freezing
c) Condensation
d) Solidification
Answer:
b) Freezing — Water vapour freezes to form snow.
Question 26: The sun’s heat plays an important role in?
a) Freezing water
b) Water cycle
c) Melting of dew
d) Condensation
Answer:
b) Water cycle — The sun drives evaporation and rainfall.
Question 27: Which of the following is the gaseous state of water?
a) Dew
b) Vapour
c) Ice
d) Rain
Answer:
b) Vapour — Vapour is the gaseous form of water.
Question 28: During evaporation, water molecules gain?
a) Heat energy
b) Coldness
c) Mass
d) Ice
Answer:
a) Heat energy — Heat is absorbed during evaporation.
Question 29: Which of the following is the main source of water vapour in the atmosphere?
a) Rivers
b) Oceans and seas
c) Lakes
d) Rain
Answer:
b) Oceans and seas — Most vapour comes from oceans and seas.
Question 30: Which process is responsible for drying clothes under the sun?
a) Melting
b) Evaporation
c) Freezing
d) Condensation
Answer:
b) Evaporation — Clothes dry because water evaporates.
Fill in the Blanks Questions for Class 6 Science Chapter 8 A Journey through States of Water
1. Water in solid state is called ___.
Answer:
Ice
2. The process of changing water into water vapour is called ___.
Answer:
Evaporation
3. The process of changing water vapour into liquid is called ___.
Answer:
Condensation
4. Water freezes into ice at ___ °C.
Answer:
0°C
5. Water boils and changes into vapour at ___ °C under normal conditions.
Answer:
100°C
6. Dew is formed due to the process of ___.
Answer:
Condensation
7. The continuous circulation of water in nature is known as the ___.
Answer:
Water cycle
8. The direct change of solid state into vapour without becoming liquid is called ___.
Answer:
Sublimation
9. Clouds are formed due to the ___ of water vapour.
Answer:
Condensation
10. The main source of water vapour in the atmosphere is ___.
Answer:
Oceans and seas
True or False Questions for Class 6 Science Chapter 8 “A Journey through States of Water”
1. Ice and water are two completely different substances because they look and feel different from each other.
Answer:
False – Ice and water are the same substance.
2. Water vapour is actually invisible; it is the tiny water droplets in steam that make it visible.
Answer:
True – Pure water vapour cannot be seen.
3. Evaporation of water only takes place when water is heated to a very high temperature.
Answer:
False – Evaporation occurs continuously at room temperature.
4. The water droplets that appear on the outer surface of a cold glass tumbler come from water seeping through the glass walls.
Answer:
False – They form due to condensation from surrounding air.
5. When water is spread over a larger surface area, it evaporates faster than when kept in a small container.
Answer:
True – Greater exposed area speeds up evaporation.
6. On a rainy day, clothes dry faster because there is more water in the air to help evaporation.
Answer:
False – High humidity slows down evaporation.
7. The process by which liquid water gets converted into solid ice is called melting.
Answer:
False – That process is called freezing, not melting.
8. Water in its gaseous state spreads out to fill the entire available space, unlike ice which retains a fixed shape.
Answer:
True – Gases have no fixed shape or volume.
9. An earthen pot keeps water cold because water seeps through its surface and evaporates, causing a cooling effect.
Answer:
True – Evaporation through porous surface causes cooling.
10. Water vapour rises in the atmosphere because it is heavier than air.
Answer:
False – Water vapour is lighter than air, so it rises.
11. Clouds are formed when water vapour in rising air cools and condenses into tiny droplets, usually around dust particles.
Answer:
True – Dust particles act as surfaces for condensation.
12. Increased movement of air always slows down the rate of evaporation of water.
Answer:
False – More air movement makes evaporation faster.
13. The continuous circulation of water between the Earth’s surface and the atmosphere is known as the water cycle.
Answer:
True – It includes evaporation, condensation, and precipitation.
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