Which process is responsible for the formation of rain?
  • Melting
  • Condensation
  • Freezing
  • Evaporation
Which factor increases the rate of evaporation?
  • Cold temperature
  • Wind and heat
  • Keeping water in a closed bottle
  • Less surface area
What happens to the level of water when it is frozen into ice?
  • It remains the same
  • It increases
  • It decreases
  • It disappears
What do we call the process of water droplets joining to form rain?
  • Condensation
  • Freezing
  • Evaporation
  • Precipitation
What happens to water vapour when it touches a cold surface?
  • It evaporates
  • It condenses into liquid
  • It freezes into ice
  • It turns into gas
What happens to the humidity level when it rains?
  • It increases
  • It decreases
  • It remains the same
  • It disappears
Which of these materials absorbs water?
  • Metal
  • Plastic
  • Cotton cloth
  • Glass
What is the main source of drinking water?
  • Oceans
  • Rivers and lakes
  • Icebergs
  • Underground water
Why do we see fog in the winter?
  • Due to evaporation
  • Due to condensation of water vapour in cold air
  • Due to melting ice
  • Due to freezing rain
How does water from the soil return to the atmosphere?
  • Evaporation
  • Freezing
  • Boiling
  • Condensation
What is the state of water in clouds?
  • Solid
  • Gas
  • Liquid droplets
  • Ice
What happens when rainwater flows into rivers?
  • It evaporates
  • It condenses
  • It joins the water cycle
  • It disappears
Which one is hard to touch?
  • Gas
  • Water
  • Stone
  • Juice
Which of the following is an example of evaporation?
  • deposition of water droplets over outer surface of glass tumbler
  • rain
  • Disappearance of water from the puddles
  • Dew
Which will have highest rate of evaporation?
  • Water in a plate kept in shade
  • Water in a plate kept on a rainy day
  • Water in plate kept in sunlight
  • Water in a small cap of bottle
Which process represents condensation?
  • Water from oceans to clouds
  • Falling of rain
  • Water from lakes to clouds
  • Water from river to clouds
State whether true or false Oceans are major source of sweet water
  • True
  • False
We should take bath by as much water as we want
  • True
  • False
What is the main subject of Chapter 8?
  • The water cycle
  • Journey through States of Water
  • How to make lemonade
  • Properties of steel plates
  • Ocean currents
According to the Thirukkural quote, what will happen if it does not rain well?
  • The ocean will become cleaner
  • The mighty ocean will be drained
  • Rivers will flow faster
  • Ice will melt faster
  • Water will evaporate slower
What do Aavi and Thirav enjoy on a summer afternoon?
  • Ice cream
  • Shikanji (lemonade)
  • Cold water
  • Juice
  • Tea
What does Thirav initially wonder about?
  • The nature of ice and water
  • How to make more lemonade
  • Why the sun is hot
  • Where rain comes from
  • How refrigerators work
Thirav's initial view is that ice and water are different because:
  • Ice is colder
  • Ice is hard and can be held, water cannot
  • Water is transparent
  • Ice floats on water
  • Water has no shape
Aavi's counterview is that ice and water are:
  • Completely different
  • The same substances
  • Made of different materials
  • Found in different places
  • Have different colours
How can you test if water and ice are the same substance?
  • By tasting them
  • By putting water in a freezer
  • By mixing them with lemonade
  • By looking at their colour
  • By weighing them
In Activity 8.1, what happens when an ice cube is left in a cup on a table?
  • It gets colder
  • It melts into water
  • It disappears
  • It becomes steam
  • It changes colour
The different forms of water are also called:
  • Types
  • States
  • Phases
  • Shapes
  • Elements
Which of these is a difference between water and ice mentioned in the text?
  • Water is blue, ice is white
  • Water flows, ice does not
  • Ice is wet, water is dry
  • Water is heavy, ice is light
  • Ice is a gas, water is a liquid
What do Aavi and Thirav observe on the playground on a rainy morning?
  • Dry ground
  • Water puddles
  • Other children playing
  • Animals drinking water
  • The sun shining
What surprises them when they go to play in the evening?
  • The puddles are frozen
  • Some water in the puddles has disappeared
  • There are more puddles
  • The water is dirty
  • The playground is closed
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