Environmental Studies · General Awareness

Greenhouse Gases and Atmosphere

1,262 Questions

Review important questions related to greenhouse gases, global warming, and atmospheric changes. The practice set focuses on identifying major pollutants and their environmental impact. These concepts are tested in the general awareness and environmental studies sections.

Greenhouse gas identificationGlobal warming processAtmospheric carbon dioxideMethane emissionsCement production emissions

Greenhouse Gases and Atmosphere Questions

Multiple choice

Which one of the following substances continues most to the causation of greenhouse effect in nature?

  1. Carbon dioxide

  2. Hydrogen fluoride

  3. Carbon monoxide

  4. Sulphur dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon dioxide is the most significant anthropogenic contributor to the greenhouse effect due to its high atmospheric concentration and long residence time. While water vapor is actually the most abundant greenhouse gas overall, CO₂ from human activities is the primary driver of enhanced greenhouse warming.

Multiple choice

Which of the following is not a greenhouse gas?

  1. Carbon dioxide

  2. Methane

  3. Water vapour

  4. Oxygen

  5. Nitrous oxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oxygen is not a greenhouse gas. It is absolutely essential for useful processes like respiration and combustion.

Multiple choice

Which of the following options is a greenhouse gas?

  1. O2

  2. N2

  3. CO2

  4. CO

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon dioxide (CO2) is a greenhouse gas that absorbs and re-emits infrared radiation, trapping heat in the atmosphere. Oxygen (O2) and nitrogen (N2) make up most of the atmosphere but do not trap heat effectively. Carbon monoxide (CO) is not classified as a major greenhouse gas like CO2.

Multiple choice

The Greenhouse Effect mainly helps in maintaining ___________.

  1. water balance in nature

  2. warm temperature of the earth

  3. carbon cycle in nature

  4. ozone layer over the atmosphere

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The greenhouse effect maintains Earth's warm temperature by trapping heat in the atmosphere through greenhouse gases. Without this natural effect, Earth's average temperature would be about -18°C instead of the current +15°C. It does not primarily maintain water balance, the carbon cycle, or the ozone layer.

Multiple choice

The excretory gases of plants are ___________.

  1. CO2 and N2

  2. CO2 and O2

  3. N2 and H2

  4. O2 and N2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The process of removal of waste products of metabolism is very essential to life. Plants get rid of excretory gases through the pores (stomata) on the surface of the leaves.

Multiple choice

Which of the following statements is correct?

  1. Carbon dioxide allows the earth to radiate heat rapidly at night.

  2. Percentage of carbon dioxide in air varies form 3% to 4%.

  3. Argon is a noble gas which is used for filling electric bulbs.

  4. A combustible substance combines with nitrogen to liberate heat energy.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Argon is used to fill light bulbs to inhibit the evaporation of the tungsten filaments and increase bulb life.

Multiple choice

Name the atmospheric gas used by plants to make proteins.

  1. Nitrogen

  2. Argon

  3. Hydrogen

  4. Carbon dioxide

  5. Oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitrogen is an essential macronutrient needed by all plants to thrive. In plants much of the nitrogen is used in chlorophyll molecules which are essential for photosynthesis and further growth. It is needed for the production of amino acids which make up proteins. Nitrogen often comes from fertilizer application and from the air. Plants cannot use nitrogen in the gaseous form so it therefore needs to be turned into either nitrate or ammonium before it can be utilised by the plant. This can be done through nitrogen fixation.

Multiple choice

Which of the following does not take place in greenhouse effect?

  1. Carbon dioxide supports greenhouse effect.

  2. Carbon dioxide absorbs heat radiations from the sun.

  3. The heat is trapped within the earth’s atmosphere.

  4. Carbon dioxide keeps earth’s atmosphere warm.

  5. Plants trap excess heat to favour greenhouse effect.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere it results in an elevation of the average surface temperature above what it would be in the absence of the gases. Plants reduce the greenhouse effect by absorbing carbon dioxide rather than excess heat radiation from the air while human activities like manufacturing increase the greenhouse effect by adding various greenhouse gases.