Test: Pollution And Calamities - 2 - Class 5 MCQ

Bio-magnification means harmful chemicals get passed from one animal to another as they eat each other in a food chain. These chemicals build up and can make animals sick, especially the ones at the top of the food chain, like big fish.

A reading of 5 or more on the Richter scale can cause a lot of damage. Earthquakes with this reading can crack walls, collapse chimneys, and cause weak buildings to fall.

Using unleaded petrol, treating sewage water before it goes into rivers, and limiting smoking to certain places all help reduce pollution. These are good for the environment.

Water vapour is not a pollutant because it is a natural part of the air. Lead oxide, sulphur dioxide, and nitrogen oxide can be harmful to both people and the environment.

Lava is the hot, melted rock that comes out when a volcano erupts. It flows down the sides of the volcano and can burn everything in its way.

Things that come from nature, like plants and animals, can break down easily and are biodegradable. These things don’t harm the environment as much as plastic or other man-made things.

Wind changes the Earth very slowly. Over time, it can move sand and soil, but it doesn’t cause quick, big changes like landslides, earthquakes, or volcanoes.

Water pollution happens when harmful things like chemicals or waste end up in rivers, lakes, or oceans, making the water dirty and unsafe for drinking or living things.

Toxic chemicals in soil can get into plants, which are eaten by animals, and then people. This is called bioaccumulation, and it can make both animals and humans sick.

Volcanoes can be active (erupting), dormant (sleeping but could erupt), or extinct (won’t erupt again). The other options are incorrect.

Metropolitan cities like Delhi have a lot of pollution because of too many vehicles, factories, and people. Rural areas have cleaner air, so doctors recommend going there to avoid breathing problems.

All of these items can be recycled. Plastic, aluminum, newspapers, and cartons can be processed and reused to make new things, which helps reduce waste.

Water from the washing machine can be reused to clean toilets. This is a good way to save water instead of wasting it.

Air pollution is linked to all of these problems. It can upset the balance of nature, trap heat in the Earth's atmosphere (greenhouse effect), and cause global warming, which makes the planet hotter.

Methane, carbon dioxide, nitrous oxide, and water vapor are all greenhouse gases that trap heat in the atmosphere and contribute to global warming.

When there is not enough rain, it causes a drought (no water), and this leads to famine (not enough food) because crops cannot grow.

Moving to the sea during an earthquake is dangerous because it could cause a tsunami (big waves). Instead, stay on high ground or move away from the sea.

Large fish have the most pesticides because they eat the small fish that already have pesticides in their bodies. This is called bio-magnification.

Terrace farming helps stop water from washing away the soil on hills. By creating flat steps, water flows slower and doesn't carry the soil away.

A tsunami is a huge wave caused by an earthquake or volcanic eruption under the sea. These waves can hit beaches and cause a lot of damage to nearby areas.