Our Environment
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Air and its Composition
SubtopicAir and its Composition under Our Environment for Grade 4 ICSE.
Preview questions (no answers)
- 1.
Air is important for birds because it helps them to:
A.Swim
B.Fly
C.Eat
D.Sleep
- 2.
Which part of our body helps us to breathe in air?
A.Stomach
B.Heart
C.Lungs
D.Liver
- 3.
Which gas is used in fire extinguishers to put out fires?
A.Oxygen
B.Nitrogen
C.Carbon dioxide
D.Hydrogen
- 4.
If we take an empty bottle and dip it into a bucket of water, we see bubbles coming out. These bubbles are:
A.Water
B.Soap
C.Air
D.Dust
- 5.
How does air reach the roots of plants growing in the soil?
A.Through the leaves
B.Through air spaces between soil particles
C.Plants do not need air in their roots
D.Through the flowers
- 6.
Which of these describes the composition of air correctly?
A.Mostly oxygen and some nitrogen
B.Mostly nitrogen and some oxygen
C.Equal parts of all gases
D.Only carbon dioxide and water vapor
- 7.
When we press the bulb of a dropper while it is inside a liquid, bubbles are seen. This is because:
A.Air is escaping from the dropper
B.The liquid is boiling
C.The dropper is breaking
D.The liquid is turning into gas
- 8.
Global warming is primarily the result of:
A.The thinning of the atmosphere
B.The increase in the Greenhouse effect
C.The decrease in the amount of oxygen
D.The movement of the Earth closer to the Sun
- 9.
Which of these would happen if the percentage of oxygen in the air was instead of ?
A.Plants would grow much faster
B.Fires would break out very easily and be hard to control
C.Animals would stop breathing
D.The sky would turn green
- 10.
What is the function of the tiny hair and mucus inside our nose in relation to the air we breathe?
A.To produce carbon dioxide
B.To filter out dust and germs from the air
C.To cool down the air before it reaches the lungs
D.To help us smell different gases in the air
Download the worksheet for Our Environment - Air and its Composition to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
What is 'Sleet'?
A.Only snow
B.Only rain
C.A mixture of rain and snow
D.Hot water
- 2.
What is the transition of water from a liquid to a solid called?
A.Melting
B.Evaporation
C.Freezing
D.Condensation
- 3.
Which of these states of water can we hold in our hand easily?
A.Liquid water
B.Ice cube
C.Water vapor
D.Steam
- 4.
How do we get groundwater out for our use?
A.By using buckets in the rain
B.By digging wells
C.By catching clouds
D.By boiling sea water
- 5.
Which of these correctly identifies the states of water in order from Coldest to Hottest?
A.Liquid -> Gas -> Solid
B.Solid -> Liquid -> Gas
C.Gas -> Liquid -> Solid
D.Solid -> Gas -> Liquid
- 6.
What role do mountains play in the water cycle?
A.They stop the sun from heating the water
B.They collect snow and release it as meltwater into rivers
C.They prevent clouds from forming
D.They absorb all the rain so it never reaches the ocean
- 7.
What is the main difference between rain and hail?
A.Rain is solid, hail is liquid
B.Rain is liquid, hail is solid ice
C.Rain falls from clouds, hail does not
D.Rain is salt water, hail is fresh water
- 8.
What is the main source of water for the process of transpiration?
A.Water vapor in the air
B.Water absorbed from the soil by roots
C.Water falling as rain on the leaves
D.Water produced by the plant during the night
- 9.
Which of these factors does NOT directly influence the speed of the water cycle in a specific region?
A.The amount of sunlight
B.The amount of vegetation
C.The color of the rocks underground
D.The average wind speed
- 10.
Water vapor is an invisible gas. How do we know it exists in the air around us if we cannot see it?
A.Because the sky is blue
B.Because it turns into visible droplets when it cools down on a cold surface
C.Because we can feel it pushing against us like wind
D.Because it makes a loud noise when it moves
Download the worksheet for Our Environment - Water Cycle to practice offline. It includes additional chapter-level practice questions.
Purification of Water
SubtopicPurification of Water under Our Environment for Grade 4 ICSE.
Preview questions (no answers)
- 1.
Why do we use a 'UV' lamp in modern water purifiers?
A.To make the water look bright
B.To kill germs using ultraviolet rays
C.To warm up the water for tea
D.To filter out the sand
- 2.
Which of these is NOT an impurity in water?
A.Dust
B.Germs
C.Fish
D.Mud
- 3.
In large scale purification, what is the first step usually taken?
A.Adding sugar
B.Boiling the whole lake
C.Sedimentation in large tanks
D.Freezing the water
- 4.
What happens if we drink water contaminated with sewage?
A.We become stronger
B.We may fall sick
C.It tastes like chocolate
D.Our hair turns blue
- 5.
If you have a mixture of oil and water, which simple observation helps you understand they are separate?
A.The oil dissolves completely
B.The oil forms a separate layer on top of the water
C.The water turns into oil
D.The oil sinks to the bottom
- 6.
Which instrument can a scientist use to see the tiny germs present in a drop of contaminated water?
A.Telescope
B.Microscope
C.Periscope
D.Stethoscope
- 7.
When cleaning a water storage tank, why is it necessary to scrub the walls?
A.To make the tank shiny
B.To remove the slippery layer of algae and accumulated dirt
C.To increase the size of the tank
D.To change the water's direction
- 8.
In the context of the environment, why is it important to purify 'Wastewater' before releasing it into rivers?
A.To make the river water taste better
B.To protect aquatic life and prevent river pollution
C.To increase the water level of the river
D.To help the fish grow faster
- 9.
A student notices that after decantation, the water is still slightly cloudy. What is the most likely reason for this?
A.The salt hasn't settled yet
B.The suspended particles are too light to settle quickly
C.The water has too much oxygen
D.The container was too clean
- 10.
If you see a 'UV' lamp inside a water purifier, what is it doing to the water flowing past it?
A.Cooling the water down
B.Filtering out the sand
C.Damaging the DNA of germs to kill them
D.Adding vitamins to the water
Download the worksheet for Our Environment - Purification of Water to practice offline. It includes additional chapter-level practice questions.
Pollution and Conservation
SubtopicPollution and Conservation under Our Environment for Grade 4 ICSE.
Preview questions (no answers)
- 1.
The wise and careful use of our natural resources to protect them for the future is called:
A.Conservation
B.Collection
C.Construction
D.Combination
- 2.
What is the best natural way to increase the amount of oxygen in the air?
A.Building more factories
B.Using fans
C.Planting more trees
D.Spraying room fresheners
- 3.
Insects and germs breed very quickly in:
A.Clean houses
B.Open garbage heaps
C.Flowing rivers
D.Closed cupboards
- 4.
Which of these bulbs uses less electricity and is better for the environment?
A.Old incandescent bulb
B.LED bulb
C.Candle
D.Torch
- 5.
Which of the following is a way to reduce air pollution from factories?
A.Removing all filters from chimneys
B.Installing tall chimneys with filters to trap soot
C.Releasing waste directly into the wind
D.Increasing the use of coal in furnaces
- 6.
Why is 'Composting' considered a good practice?
A.It produces plastic
B.It converts kitchen waste into useful manure for plants
C.It causes air pollution
D.It uses up a lot of electricity
- 7.
Which of these can be recycled to make new paper?
A.Old magazines and newspapers
B.Used paper plates with food stains
C.Laminated plastic sheets
D.Metallic foil paper
- 8.
In the process of 'Water Purification', what is the purpose of adding 'Chlorine'?
A.To make the water look sparkling blue.
B.To kill harmful germs and bacteria in the water.
C.To add a salty taste to the water for better health.
D.To make the mud sink to the bottom of the tank.
- 9.
What is the 'Ozone Layer's' primary job in our atmosphere?
A.To provide extra oxygen for airplanes to fly higher.
B.To shield the Earth from harmful ultraviolet (UV) radiation from the sun.
C.To keep the clouds from falling down to the ground.
D.To trap the heat from the moon during the night.
- 10.
Why are 'Natural Pesticides' like Neem oil preferred over chemical pesticides in farming?
A.They kill every single living thing in the field, including the crops.
B.They are less harmful to the environment and do not pollute the soil.
C.They are much more expensive and harder to find.
D.They turn the soil blue, which looks better for farming.
Download the worksheet for Our Environment - Pollution and Conservation to practice offline. It includes additional chapter-level practice questions.