Question 1

The three Rs of caring for the environment are Reduce, Reuse and

Accepted Answer

Recycle. The three Rs are Reduce, Reuse and Recycle, which help cut down waste.

Question 2

Which of these is a renewable source of energy that will never run out?

Accepted Answer

Sunlight. Sunlight is renewable and endless, while coal, petrol and diesel get used up.

Question 3

Which gas do green plants release that humans need to breathe in?

Accepted Answer

Oxygen. Plants give out oxygen, which we breathe in to stay alive.

Question 4

Which of these is biodegradable waste, meaning waste that rots naturally?

Accepted Answer

Vegetable peels. Vegetable peels rot and mix back into the soil; plastic, glass and metal do not.

Question 5

A solar panel on a rooftop mainly converts sunlight into

Accepted Answer

electricity. Solar panels change sunlight directly into electricity.

Question 6

Which way of travelling causes almost no air pollution?

Accepted Answer

Riding a bicycle. A bicycle runs on your own effort and gives out no smoke, so it causes no air pollution.

Question 7

While shopping, which bag is the more eco-friendly choice?

Accepted Answer

A cloth bag that can be reused. A cloth bag can be used again and again, so it creates far less waste than plastic.

Question 8

Which habit is the best way to save electricity at home?

Accepted Answer

Switching off lights and fans when not needed. Turning off lights and fans when they are not needed saves a lot of electricity.

Question 9

Which gas released by cars and factories is a main cause of global warming?

Accepted Answer

Carbon dioxide (CO₂). Carbon dioxide traps heat in the air, which slowly warms the Earth (global warming).

Question 10

A wind turbine (windmill) makes electricity using the energy of

Accepted Answer

moving air (wind). Moving air spins the blades of a wind turbine, which then generates electricity.

Question 11

Which of these waste items is best put into a compost pit?

Accepted Answer

Fruit and vegetable scraps. Fruit and vegetable scraps rot to form compost, a natural manure for plants.

Question 12

What does rainwater harvesting mean?

Accepted Answer

Collecting and storing rainwater for later use. Rainwater harvesting is collecting and storing rain so it can be used later instead of wasted.

Question 13

Why is it harmful to throw plastic bags into rivers and seas?

Accepted Answer

Plastic does not rot and can harm water animals. Plastic does not decay and can choke or trap fish and other water animals.

Question 14

Which eco-friendly fuel gas can be made from cow dung and kitchen waste?

Accepted Answer

Biogas. Biogas is a clean fuel made when cow dung and food waste break down.

Question 15

Planting more trees helps the environment because trees

Accepted Answer

take in carbon dioxide and give out oxygen. Trees absorb carbon dioxide and release oxygen, keeping the air fresh and clean.

Question 16

In many Indian homes, which colour dustbin is used for wet, biodegradable waste?

Accepted Answer

Green. Green bins are used for wet biodegradable waste, while blue bins hold dry recyclable waste.

Question 17

An electric car is called more eco-friendly than a petrol car mainly because while running it

Accepted Answer

does not release smoke or harmful gases. An electric car runs on a battery and gives out no smoke, so it pollutes the air far less.

Question 18

An old bulb uses 60 watts, while an LED gives the same light using only 10 watts. How much power does the LED save?

Accepted Answer

50 watts. Power saved = 60 − 10 = 50 watts, so the LED uses much less electricity for the same light.

Question 19

The ozone layer high above the Earth protects living things by

Accepted Answer

blocking harmful ultraviolet (UV) rays from the Sun. The ozone layer absorbs most of the harmful ultraviolet rays from the Sun before they reach us.

Question 20

Which everyday activity adds the most extra carbon dioxide to the air?

Accepted Answer

Burning fossil fuels like coal and petrol. Burning fossil fuels such as coal and petrol releases large amounts of carbon dioxide.

Environmental Awareness & Eco-friendly Technologies — Homi Bhabha Class 6 General Knowledge MCQs with Solutions

Questions with solutions