Aavi initially thinks the disappearing water has been:
  • Evaporated
  • Absorbed by the soil
  • Drunk by animals
  • Carried away by wind
  • Turned to ice
Where else is water disappearance mentioned?
  • On washed utensils
  • In a swimming pool
  • In a river
  • In a bottle
  • In the ocean
Activity 8.2 investigates water disappearance using a:
  • Glass tumbler
  • Steel plate
  • Cloth
  • Paper towel
  • Plastic bag
What is the conclusion from Activity 8.2?
  • Water seeps through steel
  • Water turns into a gas called water vapour
  • Water is absorbed by the air
  • Water becomes invisible
  • Water turns into ice
The process of water turning into vapour is called:
  • Condensation
  • Evaporation
  • Freezing
  • Melting
  • Solidification
What example is given for evaporation?
  • Water boiling
  • Ice melting
  • Drying of wet clothes
  • Rain falling
  • Snow forming
What happens when water is sprinkled on a hot pan?
  • It freezes
  • It turns into steam (water vapour)
  • It forms ice
  • It becomes hard
  • It changes colour
Steam is actually:
  • Tiny droplets of water in water vapour
  • Pure air
  • Smoke
  • A different gas
  • Dust particles
In Activity 8.3, what is added to a glass tumbler of cold water?
  • Salt
  • Sugar
  • Ice cubes
  • Lemon juice
  • Food colouring
What appears on the outer surface of the glass tumbler after a few minutes?
  • Salt crystals
  • Water droplets
  • Dust
  • Frost
  • Cracks
Aavi and Thirav's chain of reasoning initially considers that water might have:
  • Evaporated
  • Seeped out of the tumbler
  • Been drunk by someone
  • Frozen on the outside
  • Been absorbed by the glass
Dew drops on plants are an example of:
  • Evaporation
  • Condensation
  • Freezing
  • Melting
  • Boiling
The process of water vapour turning into liquid is called:
  • Evaporation
  • Condensation
  • Freezing
  • Melting
  • Sublimation
In Activity 8.4, what is used to measure mass?
  • A ruler
  • A thermometer
  • A digital weighing balance
  • A measuring cylinder
  • A clock
What happens to the mass reading in Activity 8.4 over time?
  • It increases
  • It decreases
  • It stays the same
  • It becomes zero
  • It fluctuates randomly
The increase in mass in Activity 8.4 is due to:
  • Water seeping out
  • Water evaporating
  • Condensation of water vapour from the air
  • Ice melting
  • The glass getting heavier
The amount of water vapour in the air is called:
  • Temperature
  • Pressure
  • Humidity
  • Density
  • Volume
What modification is suggested to Activity 8.4 to check if water seeps out?
  • Use a different liquid
  • Mark the water level on the tumbler
  • Use a hotter room
  • Add more ice
  • Shake the tumbler
Water can exist in how many different states?
  • One
  • Two
  • Three
  • Four
  • Five
In its solid state, water is called:
  • Steam
  • Vapour
  • Ice
  • Snow
  • Fog
In its gaseous state, water is called:
  • Ice
  • Water
  • Water vapour
  • Dew
  • Cloud
According to Table 8.3, what property does ice (solid) have?
  • It takes the shape of its container
  • It has a fixed shape
  • It flows easily
  • It spreads out indefinitely
  • It is invisible
According to Table 8.3, what property does water (liquid) have?
  • It has a fixed shape
  • It does not flow
  • It takes the shape of its container
  • It cannot be poured
  • It is always hard
According to Table 8.3, what property does water vapour (gas) have?
  • It has a fixed shape
  • It does not spread
  • It spreads out in the available space
  • It can be held in your hand
  • It is always visible
To change ice into water, you need to:
  • Cool it
  • Heat it
  • Add salt
  • Put it in a container
  • Shake it
To change water into ice, you need to:
  • Heat it
  • Cool it
  • Add sugar
  • Stir it
  • Expose it to air
The process of a solid turning into a liquid is called:
  • Freezing
  • Melting
  • Evaporation
  • Condensation
  • Boiling
The process of a liquid turning into a solid is called:
  • Melting
  • Freezing
  • Evaporation
  • Condensation
  • Sublimation
Coconut oil solidifying in winter is an example of:
  • Melting
  • Freezing
  • Evaporation
  • Condensation
  • Boiling
In Fig. 8.5, what process converts a solid to a liquid?
  • Condensation
  • Evaporation
  • Freezing
  • Melting
  • Deposition
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