In Fig. 8.5, what process converts a liquid to a gas?
  • Melting
  • Freezing
  • Condensation
  • Evaporation
  • Sublimation
In Fig. 8.5, what process converts a gas to a liquid?
  • Evaporation
  • Condensation
  • Melting
  • Freezing
  • Deposition
In Fig. 8.5, what is state A?
  • Solid
  • Liquid
  • Gas
  • Plasma
  • Ice
In Fig. 8.5, what is state B?
  • Solid
  • Liquid
  • Gas
  • Plasma
  • Vapour
In Fig. 8.5, what is state C?
  • Solid
  • Liquid
  • Gas
  • Plasma
  • Water
Activity 8.7 investigates how what affects evaporation rate?
  • Colour of the container
  • Exposed area of water
  • Type of water
  • Time of day
  • Shape of the container
In Activity 8.7, where does water evaporate faster?
  • In a bottle cap (less area)
  • On a plate (more area)
  • In a closed bottle
  • In a deep cup
  • In a dark room
What is the conclusion from Activity 8.7?
  • Water evaporates faster with less exposed area
  • Water evaporates faster with more exposed area
  • The container material doesn't matter
  • Cold water evaporates faster
  • Salt water evaporates slower
What other condition is suggested to affect evaporation rate?
  • The colour of the water
  • The presence of wind (windy day)
  • The type of container
  • The time of year
  • The brand of water
Atmospheric Water Generator (AWG) machines produce water by:
  • Melting ice
  • Boiling water
  • Condensing water vapour from air
  • Filtering seawater
  • Digging wells
The quote at the start of the chapter is from:
  • The Bible
  • The Quran
  • Thirukkural
  • A science textbook
  • A poem
What does the hand sanitiser example demonstrate?
  • Freezing
  • Evaporation
  • Condensation
  • Melting
  • Solidification
When we boil water in a half-filled utensil, where do drops on the lid come from?
  • They seep through the lid
  • They are from the air
  • They are condensed water vapour from the boiling water
  • They are impurities in the water
  • They are from the stove
Why are dew drops seen more in the morning?
  • It is warmer
  • The air is colder, causing condensation
  • Plants release water at night
  • It rains more at night
  • The sun evaporates water at night
What property does a liquid have regarding its volume?
  • It has no volume
  • Its volume changes with the container
  • Its volume remains constant
  • Its volume increases when heated
  • Its volume decreases when cooled
What property does a gas have regarding its shape?
  • It has a fixed shape
  • It takes the shape of its container
  • It has no shape
  • It is always round
  • It is always flat
How can you smell food from the kitchen?
  • Sound waves carry the smell
  • Gases from the food spread through the air
  • Liquid particles travel to your nose
  • Solid particles float in the air
  • Light carries the smell
What are examples of gases mentioned?
  • Water and milk
  • Oxygen and carbon dioxide
  • Stone and wood
  • Ice and steam
  • Oil and ghee
What are examples of solids mentioned?
  • Water and oil
  • Stones, wood, and glass
  • Milk and juice
  • Oxygen and carbon dioxide
  • Steam and vapour
What are examples of liquids mentioned?
  • Ice and steam
  • Milk and oil
  • Oxygen and carbon dioxide
  • Stones and wood
  • Glass and metal
Candle wax changing from solid to liquid is an example of:
  • Freezing
  • Melting
  • Evaporation
  • Condensation
  • Boiling
What is the primary purpose of a freezer?
  • To evaporate water
  • To melt ice
  • To freeze water into ice
  • To condense vapour
  • To heat food
The main reason water disappears from a steel plate (Activity 8.2) is:
  • Seeping
  • Absorption by the plate
  • Evaporation
  • Condensation
  • Freezing
The main reason water droplets form on a cold tumbler (Activity 8.3) is:
  • Seeping
  • Evaporation
  • Condensation
  • Melting
  • Freezing
What is the state of water vapour at room temperature?
  • Solid
  • Liquid
  • Gas
  • Plasma
  • Ice
Water vapour in the air is:
  • Always visible
  • Invisible
  • Always cold
  • Always hot
  • Always moving upwards
What happens to the water level in the modified Activity 8.4?
  • It goes down
  • It goes up
  • It stays the same
  • It disappears
  • It overflows
What does the constant water level in the tumbler prove?
  • Water is evaporating
  • Water is condensing
  • Water is not seeping out
  • Water is freezing
  • Water is boiling
What does the increase in mass on the balance prove?
  • Water is seeping out
  • Water vapour from the air is condensing and adding mass
  • The ice is melting
  • The glass is expanding
  • The balance is broken
What is the key factor for condensation to occur?
  • A hot surface
  • A cold surface
  • A windy surface
  • A dry surface
  • A rough surface
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0