Free Environment and Atmosphere MCQs with Answers

201. Place directly above focus on Earth's surface is known as _________?

• A. Strike
• B. Comma
• C. Epicenter
• D. Origin

Explanation: The epicenter is the point on the Earth's surface directly above the focus, where the earthquake begins underground. The focus is also called the hypocenter, while the other listed terms are not the correct name.

202. Magnitude of energy released by an earthquake is calculated using ________?

• A. Earthquake scale
• B. Seismic scale
• C. Richter scale
• D. Temblor scale

Explanation: The Richter scale was traditionally used to express an earthquake's magnitude from the size of its seismic waves, which reflects energy released. Modern seismology often uses the moment magnitude scale for large earthquakes, but Richter is the intended option here.

203. Animals living in the Tree trunks are known as___________?

• A. Arboreal
• B. Volant
• C. Amphibious
• D. Aquaticx

Explanation: Arboreal animals live mainly in trees, including on branches and trunks. Volant refers to flying animals, while amphibious animals live both in water and on land.

204. Study of Soil is called__________?

• A. Pedology
• B. Pedagogy
• C. sociology
• D. Demography

Explanation: Pedology is the scientific study of soil, including its formation, classification, composition, and properties. Pedagogy concerns teaching, so the similar spelling is the main trap.

205. Nephology is study of_____________?

• A. Knowledge
• B. Clouds
• C. Rain
• D. None

Explanation: Nephology is the branch of atmospheric science concerned with clouds, including their formation and classification. The related study of rain is pluviology.

206. Which of the following is responsible for largest amount of oxygen on earth?

• A. Peat bogs
• B. Algae
• C. Trees
• D. None of these

Explanation: Marine algae and microscopic phytoplankton carry out enormous amounts of photosynthesis and produce roughly half of Earth’s oxygen. Trees contribute oxygen, but they are not the largest overall source.

207. Which of the following gases do plants and trees give out during photosynthesis?

• A. Hydrogen
• B. Nitrogen
• C. Oxygen
• D. Carbon dioxide

Explanation: During photosynthesis, plants use carbon dioxide and water to make glucose, releasing oxygen as a by-product. This oxygen enters the atmosphere through tiny pores in leaves.

208. In which part of the Plant does photosynthesis take place?

• A. Flowers
• B. Roots
• C. Stem
• D. Leaves

Explanation: Photosynthesis occurs mainly in the leaves because their green cells contain chlorophyll inside chloroplasts. Chlorophyll captures light energy to help convert water and carbon dioxide into food.

209. A group of elephants is called___________?

• A. ZEAL
• B. Herd
• C. MOB
• D. TOWER

Explanation: Elephants are social animals that live and move in groups called herds. “Tower” is a collective noun associated with giraffes, not elephants.

210. Air contains maximum amount of__________?

• A. oxygen
• B. nitrogen
• C. hydrogen
• D. carbon dioxide

Explanation: Dry air contains about 78% nitrogen, compared with about 21% oxygen. Hydrogen and carbon dioxide are present only in very small amounts.