Air Pollution & Prevention — Homi Bhabha Class 6 Chemistry MCQs with Solutions
Free Homi Bhabha Class 6 Chemistry Air Pollution & Prevention MCQs with step-by-step solutions (10 questions). Part of Air and Atmosphere. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Air Pollution & Prevention · easy · theory
Air pollution means that the air has …
A. Only clean oxygen
B. More nitrogen than usual
C. Pure water in it
D. Harmful substances mixed into it ✓ Correct
Solution: Air pollution is when harmful gases, smoke or dust get mixed into the air, making it unhealthy.
Q2 — Air Pollution & Prevention · easy · theory
Which of these adds smoke and harmful gases to the air?
A. Green growing trees
B. Smoke from vehicles and factories ✓ Correct
C. A garden of flowers
D. A clean flowing river
Solution: Vehicles and factories burn fuel and release smoke and harmful gases that pollute the air.
Q3 — Air Pollution & Prevention · easy · theory
Which of these helps keep the air clean?
A. Burning garbage
B. Planting more trees ✓ Correct
C. Running factories without filters
D. Driving more cars
Solution: Trees take in carbon dioxide and give out oxygen, so planting more trees helps keep the air clean.
Q4 — Air Pollution & Prevention · easy · theory
Trees help clean the air because they …
A. Give out thick smoke
B. Make a lot of dust
C. Take in oxygen and give out smoke
D. Take in carbon dioxide and give out oxygen ✓ Correct
Solution: Trees take in carbon dioxide and release oxygen, which freshens the air we breathe.
Q5 — Air Pollution & Prevention · medium · theory
Which of these is a cleaner fuel that causes less air pollution than petrol or diesel?
A. Coal
B. Kerosene
C. Firewood
D. CNG (compressed natural gas) ✓ Correct
Solution: CNG burns more cleanly than petrol or diesel, so it gives out fewer harmful gases.
Q6 — Air Pollution & Prevention · medium · theory
Which of these is a good way to cut down air pollution from vehicles?
A. Burning more petrol
B. Using bicycles, buses and walking more ✓ Correct
C. Keeping car engines running while parked
D. Everyone driving their own car
Solution: Sharing buses, cycling and walking mean fewer vehicles burning fuel, so less pollution goes into the air.
Q7 — Air Pollution & Prevention · medium · theory
A poisonous gas given out by vehicles when fuel does not burn fully is …
A. Oxygen
B. Water vapour
C. Nitrogen
D. Carbon monoxide ✓ Correct
Solution: Incomplete burning of fuel in vehicles gives out carbon monoxide, a poisonous gas.
Q8 — Air Pollution & Prevention · medium · theory
Breathing polluted air can cause …
A. Better eyesight
B. No effect at all
C. Stronger bones
D. Coughing and breathing problems ✓ Correct
Solution: Polluted air harms our lungs and can cause coughing, breathing trouble and other health problems.
Q9 — Air Pollution & Prevention · hard · theory
In winter, big cities are often covered by a mix of smoke and fog that makes it hard to see and breathe. This is called …
A. Dew
B. Steam
C. A rainbow
D. Smog ✓ Correct
Solution: Smog is a mixture of smoke and fog; the word itself comes from "smoke" and "fog".
Q10 — Air Pollution & Prevention · hard · theory
Factories can reduce the smoke they release into the air by …
A. Burning more coal
B. Building taller houses nearby
C. Fitting filters in their chimneys to trap harmful particles ✓ Correct
D. Running day and night without stopping
Solution: Filters fitted in chimneys trap the harmful smoke particles before the gases are let out, reducing air pollution.