Pollution: Types, Causes and Prevention: 18 MCQs with answers

Harmful substances entering the environment and making it unsafe

Pollution is defined as the entry of harmful substances into the environment, making air, water, or land unsafe for living organisms.

No, pollution is mainly caused by human activities

The main causes of pollution are human activities such as vehicles, factories, plastic, garbage, and burning of fuel.

Noise pollution

Noise pollution is caused by loud and unwanted sounds from vehicles, horns, loudspeakers, construction work, factories, and machines.

Water pollution

Water pollution happens when harmful substances like garbage, plastic, sewage, and chemicals enter rivers and ponds.

Burning of coal, wood, and garbage

Air pollution is caused by harmful smokes, dust, and gases, mainly from vehicles, factories, and burning of coal, wood, and garbage.

True

Pollution is mainly caused by human activities such as vehicles, factories, plastic, garbage, and burning of fuel.

Both A and R are true, and R correctly explains A

Noise pollution is invisible because you cannot see it, unlike smoke or dirty water, but it causes real harm such as stress, sleep disturbance, and hearing problems.

I, II, and III are all correct

All three statements are correct: air pollution comes from vehicles and factories, water pollution makes water unsafe, and noise pollution is caused by loud unwanted sounds.

The water becomes unsafe for drinking

Water pollution from chemicals makes water unsafe for drinking. Factories should treat their waste before releasing it into water bodies.

Harmful chemicals from soil enter plants and then our food

Harmful chemicals from polluted soil enter plants, and then the food we eat. Soil pollution also makes soil less useful for growing crops.

Using public transport, walking, or cycling

Air pollution can be reduced by planting more trees, using public transport, walking, or cycling, and by controlling harmful smoke from factories.

Reducing loud sounds and using barriers

Noise pollution is caused by loud and unwanted sounds. Reducing loud sounds and using barriers directly addresses the source of noise pollution.

A human activity releases a harmful substance, it travels through air or water, and living organisms suffer harm

The chain is: Source — a human activity releases a harmful substance. Pathway — the substance travels through a natural system. Victim — living organisms absorb or encounter the substance and suffer harm.

When air is polluted we breathe it, when water is polluted we drink it, and when soil is polluted we eat food grown in it

Pollution is a human issue: polluted air is breathed in, polluted water is drunk, and polluted soil affects the food we eat. Noise pollution also causes stress and hearing problems.

Student A, because treating waste directly stops chemicals from entering water

For preventing industrial chemicals from entering water bodies, treating factory waste before release is the most direct solution. Student B's approach addresses garbage, not industrial chemicals.

Loudspeakers at a wedding

Loudspeakers cause noise pollution, while smoke from a factory chimney, exhaust fumes from a car, and burning of coal all cause air pollution.

The water will become unsafe for drinking, harming both humans and aquatic life.

The correct option highlights the direct impact of chemical waste on water quality, leading to unsafe drinking water and harm to aquatic ecosystems, which is a well-documented consequence of water pollution.

They are addressing the source stage, which will significantly improve water quality and protect local ecosystems.

By treating sewage before it enters rivers, the community is effectively addressing the source stage of pollution. This intervention will significantly improve water quality and protect both human health and local ecosystems.