Class 10 Physics: Our Environment MCQ

The environment is a complex web of interactions between living organisms and their surroundings. Dive into the intricacies of our environment with these multiple-choice questions. Each question is complemented by the correct answer and a concise explanation.

1. Which of the following is NOT a biotic component of the environment?

a) Trees
b) Animals
c) Soil
d) Bacteria

Answer:

c) Soil

Explanation:

Biotic components refer to living entities in the environment. Soil is an abiotic component.

2. The phenomenon where the earth’s surface temperature increases due to trapped greenhouse gases is called:

a) Ozone layer depletion
b) Acid rain
c) Global warming
d) Air pollution

Answer:

c) Global warming

Explanation:

Global warming is caused by the enhanced greenhouse effect, where certain gases trap heat within the earth’s atmosphere.

3. Which of the following is a non-biodegradable waste?

a) Vegetable peels
b) Paper
c) Plastic bags
d) Cotton cloth

Answer:

c) Plastic bags

Explanation:

Plastic bags do not decompose easily and are considered non-biodegradable.

4. Which layer of the atmosphere protects us from harmful ultraviolet rays?

a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere

Answer:

b) Stratosphere

Explanation:

The ozone layer, which absorbs harmful ultraviolet rays, is located in the stratosphere.

5. The primary source of energy for our environment is:

a) Wind
b) Electricity
c) The Sun
d) Fossil fuels

Answer:

c) The Sun

Explanation:

The Sun provides the primary energy that drives most of the processes in our environment.

6. Acid rain is caused by the emission of:

a) Carbon dioxide and methane
b) Nitrogen oxides and sulfur dioxide
c) Carbon monoxide and nitrogen
d) Hydrogen and helium

Answer:

b) Nitrogen oxides and sulfur dioxide

Explanation:

When nitrogen oxides and sulfur dioxide mix with water vapor in the atmosphere, they form acidic compounds leading to acid rain.

7. Which of these is a renewable source of energy?

a) Coal
b) Natural gas
c) Solar energy
d) Nuclear energy

Answer:

c) Solar energy

Explanation:

Solar energy is derived from the Sun, making it renewable as it won’t run out in human timescales.

8. Deforestation leads to:

a) Decrease in soil erosion
b) Increase in humidity
c) Decrease in carbon dioxide levels
d) Loss of biodiversity

Answer:

d) Loss of biodiversity

Explanation:

By eliminating habitats, deforestation results in a decline in species diversity.

9. Ecosystems which are artificially created by humans are termed:

a) Natural ecosystems
b) Terrestrial ecosystems
c) Man-made ecosystems
d) Aquatic ecosystems

Answer:

c) Man-made ecosystems

Explanation:

Examples of man-made ecosystems include agricultural land, gardens, and urban areas.

10. The process by which water is continually circulated in nature is called:

a) Carbon cycle
b) Oxygen cycle
c) Water cycle
d) Nitrogen cycle

Answer:

c) Water cycle

Explanation:

The water cycle involves processes like evaporation, condensation, and precipitation, ensuring continuous circulation of water.

11. A stable community of plants and animals reached after a series of changes is called:

a) Food chain
b) Biome
c) Climax community
d) Trophic level

Answer:

c) Climax community

Explanation:

A climax community represents the final stage of ecological succession and remains stable until disrupted.

12. Biomagnification refers to the:

a) Increase in the number of species in a food chain
b) Increase in temperature due to global warming
c) Increase in the concentration of harmful substances at higher trophic levels
d) Increase in biomass in an ecosystem

Answer:

c) Increase in the concentration of harmful substances at higher trophic levels

Explanation:

As one moves up the food chain, the concentration of certain harmful substances can increase, leading to detrimental effects on top predators.

13. Which gas is primarily responsible for ozone layer depletion?

a) Carbon dioxide
b) Chlorofluorocarbons (CFCs)
c) Methane
d) Nitrogen

Answer:

b) Chlorofluorocarbons (CFCs)

Explanation:

CFCs released into the atmosphere can reach the ozone layer and lead to its depletion.

14. Which of the following is a cause of soil erosion?

a) Afforestation
b) Deforestation
c) Conservation farming
d) Crop rotation

Answer:

b) Deforestation

Explanation:

Deforestation removes trees which hold soil together, making it more prone to erosion.

15. The process of converting wasteland into a forest is called:

a) Reforestation
b) Afforestation
c) Deforestation
d) Desertification

Answer:

b) Afforestation

Explanation:

Afforestation involves planting trees on land that hasn’t been forested for a long time, or ever.

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