Environment & Ecology Questions for RRB Group D Exam: Download Free PDF

If you are preparing for the RRB Group D exam, you already know that the General Science and General Awareness sections decide your final selection. Out of these sections, “Environment and Ecology” is a hidden scoring topic. Many students ignore it and only read Physics or Chemistry. But the Railway board loves asking 2 to 3 direct questions about our nature, pollution, and atmosphere in almost every shift. Many students feel scared thinking they have to study tough biology concepts or big environmental laws. But here is a big secret: the exam only asks very basic, daily-life questions about our surroundings. If you know simple things like the name of greenhouse gases or when we celebrate Environment Day, you can easily grab these free marks. To make your preparation super easy, we have explained this topic in the simplest words and provided real exam-level questions below.

What is Environment and Ecology? (Explained in Simple Words)

You do not need to read thick science books to pass this section. Let us understand it like a normal story.

• Environment: This is everything around you. The air you breathe, the water you drink, the soil, the trees, and the sunlight. All these make up your environment.
• Ecology: This is simply the study of “Friendship.” It is the study of how living things (like humans, animals, and plants) live together and connect with their non-living environment (like water and sunlight).

What to study for the RRB Group D Exam? You can divide this topic into four simple parts:

1. Pollution: Read about air, water, and soil pollution. Know which gases cause acid rain or global warming.
2. Ozone Layer: Understand what the ozone layer does and which gas (like CFC) destroys it.
3. Food Chain: Basic things like who eats whom. (For example: Grass is eaten by a deer, and the deer is eaten by a lion).
4. Important Days: Memorize basic dates like Earth Day, Water Day, and Environment Day.

If you just focus on these simple daily topics, you will never miss a question in the exam!

Important Environment & Ecology Questions for Practice

Now that you know what to study, let us test your preparation. Grab a pen and solve these top repeated Environment and Ecology questions below to check your actual exam readiness right now.

Q1. Which of the following is the main “Greenhouse Gas” responsible for global warming?

(A) Oxygen
(B) Nitrogen
(C) Carbon Dioxide
(D) Hydrogen

Answer: (C) Carbon Dioxide

Explanation: Carbon Dioxide (CO2) traps the heat of the sun inside the earth’s atmosphere. This makes our planet hotter, which is called global warming.

Q2. The Ozone layer protects the earth from which harmful rays of the sun?

(A) Infrared rays
(B) Ultraviolet (UV) rays
(C) X-rays
(D) Gamma rays

Answer: (B) Ultraviolet (UV) rays

Explanation: The ozone layer acts like an umbrella for the earth. It stops the dangerous Ultraviolet (UV) rays from reaching us, which can otherwise cause skin cancer.

Q3. On which date do we celebrate “World Environment Day” every year?

(A) 5th June
(B) 22nd April
(C) 22nd March
(D) 16th September

Answer: (A) 5th June

Explanation: World Environment Day is celebrated on the 5th of June all over the world to spread awareness about saving our nature. (Note: 22nd April is Earth Day).

Q4. Which of the following is an “Abiotic” (non-living) component of the environment?

(A) Plants
(B) Animals
(C) Sunlight
(D) Bacteria

Answer: (C) Sunlight

Explanation: “Biotic” means living things (like plants and animals). “Abiotic” means non-living things that we need to survive, like sunlight, water, and air.

Q5. In a simple food chain, green plants are known as what?

(A) Consumers
(B) Decomposers
(C) Producers
(D) Predators

Answer: (C) Producers

Explanation: Green plants make their own food using sunlight. Because they “produce” food for everyone else, they are called Producers.

Q6. Which unit is used to measure the thickness of the Ozone layer?

(A) Decibel
(B) Dobson
(C) Pascal
(D) Newton

Answer: (B) Dobson

Explanation: The thickness of the ozone layer in the atmosphere is measured in Dobson Units (DU). Decibel is used for sound.

Q7. The tragic Bhopal Gas Tragedy (1984) was caused by the leakage of which poisonous gas?

(A) Carbon Monoxide
(B) Methyl Isocyanate
(C) Chlorine
(D) Ammonia

Answer: (B) Methyl Isocyanate

Explanation: This is a very repeated question. The leakage of Methyl Isocyanate (MIC) gas from a factory in Bhopal caused the death of thousands of people.

Q8. Which of the following is a “Renewable” source of energy?

(A) Coal
(B) Petroleum
(C) Solar Energy
(D) Natural Gas

Answer: (C) Solar Energy

Explanation: Renewable means something that will never finish. Solar energy (sunlight) and wind energy are renewable. Coal and petrol will finish one day, so they are non-renewable.

Q9. Which harmful gas is released mostly from refrigerators and ACs that destroys the ozone layer?

(A) Methane
(B) Chlorofluorocarbons (CFCs)
(C) Sulfur Dioxide
(D) Helium

Answer: (B) Chlorofluorocarbons (CFCs)

Explanation: CFCs were widely used in cooling machines like fridges and air conditioners. When they go up into the sky, they break the ozone layer.

Q10. Acid rain is mainly caused by the pollution of which two gases?

(A) Oxygen and Nitrogen
(B) Sulfur Dioxide and Nitrogen Oxide
(C) Carbon Monoxide and Methane
(D) Ozone and Helium

Answer: (B) Sulfur Dioxide and Nitrogen Oxide

Explanation: When smoke from factories (containing sulfur and nitrogen oxides) mixes with rain clouds, it turns the normal rain into acid rain.

5 Simple Tips to Prepare Environment & Ecology

You do not need to be a science topper to score full marks here. Just play smart. Here are 5 easy and practical tips to cover this topic quickly:

• Stick to 10th Level Books: Do not buy heavy books. The RRB Group D exam only asks basic 9th and 10th-class science questions. Reading basic NCERT summary notes is more than enough.
• Make a “Dates” Chart: Railway exams love dates! Make a small list on a piece of paper for Environment Day, Earth Day, Water Day, and Ozone Day. Stick it on your wall and look at it daily.
• Connect with Daily News: If there is a big news about a pollution scheme or a plastic ban, the examiner might ask a related basic question. Keep your eyes open to daily environmental news.
• Memorize the Gases: You must know which gas does what. Make a tiny list: CO2 = Global Warming, CFC = Ozone Hole, SO2 = Acid Rain. This one trick will save you a lot of time.
• Practice Previous Year Papers: The Railway Recruitment Board (RRB) repeats its science questions heavily. Solve the previous year’s questions of Group D and NTPC. You will see the exact same concepts repeating!

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FAQs: Environment & Ecology Questions for RRB Group D

1. Is Environment and Ecology an important subject for RRB Group D?

Yes. It falls under the General Science and General Awareness sections. You can easily expect 2 to 3 direct questions from topics like pollution, gases, and basic ecology.

2. Do I need to read heavy Biology books for this?

Absolutely not. The questions are based on very common daily-life science. Basic knowledge of 10th-standard environmental science is more than enough.

3. Are questions about National Parks and Sanctuaries included in this topic?

Yes, questions about wildlife protection, national parks, and tiger reserves are a mixed part of Static GK and Ecology. They are very important for the exam.

4. What are the most repeated topics in this section?

The most repeated topics are the Greenhouse Effect, Ozone Layer Depletion, Acid Rain, important environmental dates, and basic food chain rules.

5. Is there a negative marking for wrong answers in the RRB Group D exam?

Yes, there is a strict negative marking of 1/3rd mark for every incorrect answer. If you do not know the name of a gas, do not guess blindly. It is better to skip.

6. How much time should I spend on this topic?

Since it is a very small topic, just giving 2 to 3 hours to read the basics and solving previous year questions is enough to secure full marks.