What is the key factor for evaporation to occur?
  • A cold temperature
  • Heat (can be at room temperature)
  • High pressure
  • A closed container
  • A dark room
On a hot day, evaporation is:
  • Slower
  • Faster
  • The same as a cold day
  • Not possible
  • Reversed
On a windy day, evaporation is:
  • Slower
  • Faster
  • Unaffected
  • Stops completely
  • Causes condensation
Drying clothes on a windy day is faster because:
  • Wind increases evaporation
  • Wind decreases temperature
  • Wind adds water to the clothes
  • Wind freezes the clothes
  • Wind makes the clothes heavier
Sweating cools our body because:
  • Sweat is cold
  • Evaporation of sweat absorbs heat from our body
  • Sweat blocks pores
  • Sweat contains ice
  • Sweat condenses on the skin
What is the primary way to change a liquid to a gas?
  • Cooling it
  • Heating it
  • Adding salt
  • Stirring it
  • Putting it in a larger container
What is the primary way to change a gas to a liquid?
  • Heating it
  • Cooling it
  • Adding pressure
  • Removing air
  • Shaking it
The term "states of water" refers to its:
  • Chemical composition
  • Physical forms (solid, liquid, gas)
  • Geographical locations
  • Taste and smell
  • Purity levels
Which state of water has the least dense arrangement of molecules?
  • Solid
  • Liquid
  • Gas
  • All are the same
  • It depends on temperature
Which state of water has a definite volume but no definite shape?
  • Solid
  • Liquid
  • Gas
  • Plasma
  • All states
Which state of water has neither a definite shape nor a definite volume?
  • Solid
  • Liquid
  • Gas
  • Plasma
  • Ice
When water freezes, its volume:
  • Decreases
  • Increases
  • Stays the same
  • Disappears
  • Becomes zero
The main theme of the chapter is to explore:
  • The chemical formula of water
  • The different states and changes of state of water
  • The history of water usage
  • How to find water in the desert
  • The cost of water
Activity 8.6 is designed to help understand the:
  • Interconversion of states of water
  • Weight of different states
  • Taste of different states
  • Speed of sound in water
  • Colour of water
The process where a liquid gains heat and turns to gas is:
  • Condensation
  • Evaporation
  • Freezing
  • Melting
  • Sublimation
The process where a gas loses heat and turns to liquid is:
  • Evaporation
  • Condensation
  • Melting
  • Freezing
  • Deposition
The process where a liquid loses heat and turns to solid is:
  • Melting
  • Freezing
  • Evaporation
  • Condensation
  • Boiling
The process where a solid gains heat and turns to liquid is:
  • Freezing
  • Melting
  • Evaporation
  • Condensation
  • Sublimation
In the context of water, what is "steam"?
  • Liquid water droplets in air
  • Visible water vapour with tiny droplets
  • Invisible gas
  • Solid ice particles
  • Hot air
What is the primary source of water vapour in the air around us?
  • Volcanoes
  • Evaporation from water bodies
  • Breathing of animals
  • Melting of ice
  • Condensation on surfaces
What is the main reason for using a digital balance in Activity 8.4?
  • To measure temperature
  • To measure volume
  • To measure mass change
  • To measure time
  • To measure density
The chapter concludes that states of water can be changed by:
  • Changing its colour
  • Heating or cooling
  • Adding other substances
  • Shaking it
  • Placing it in sunlight
Water is essential for survival of plants and animals.
  • True
  • False
List down the uses of water
  • Domestic purpose
  • Transportation of minerals
  • Industrial purpose
  • All of the above
Water is a good _______
  • Solute
  • Solvent
  • Solution
  • All of the above
The water present below the surface is called _______
  • River
  • Lake
  • Groundwater
  • None of the above
Open source of water are
  • River
  • Lake
  • Both of these
  • None of these
________ and _______ are used to draw water from ground water.
  • Hand pump
  • Tube well
  • Both of these
  • None of these
Ocean water cannot be used for domestic purpose because it contains
  • Soluble salts
  • Dust
  • Acuds
  • Insoluble salts
How much of earth's surface is covered with water?
  • Two third
  • One third
  • Three fourth
  • Two fourth
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