Free Environment and Atmosphere MCQs with Answers

241. In which layer of atmosphere does commercial aircrafts usually fly?

• A. Stratosphere
• B. Troposphere
• C. Mesosphere
• D. Thermosphere

Explanation: Long-distance commercial aircraft commonly cruise in the lower stratosphere, above much of the weather and turbulence of the troposphere. The exact altitude varies with aircraft, route and conditions.

242. Water vapour beyond the dew point result in_________?

• A. Precipitation
• B. Hailstorm
• C. Condensation
• D. Formation of ice

Explanation: At the dew point, air is saturated with water vapour, so additional cooling or vapour causes condensation into liquid droplets. Clouds, fog and dew are common results of this process, while precipitation requires droplets or ice particles to grow and fall.

243. What is the effect of height increase over temperature?

• A. Temperature increase
• B. Temperature decrease
• C. Remains constant
• D. None

Explanation: In the lower atmosphere, temperature generally decreases as altitude increases because air pressure falls and rising air expands and cools. This is why high mountain regions are colder than nearby lowlands.

244. International date line passes through which strait?

• A. Malacca Strait
• B. Adam Strait
• C. Bering Strait
• D. Java Strait

Explanation: The International Date Line broadly follows the 180° meridian and passes through the Bering Strait. It bends around islands and countries to avoid dividing populated areas.

245. Bamboo is a__________?

• A. Herb
• B. Grass
• C. Shurb
• D. Tree

Explanation: Bamboo is a type of grass in the family Poaceae, despite its tall, woody, tree-like appearance. Its hollow stems and rapid growth help distinguish it from true trees.

246. Study of current and past landscapes formation is known as____________?

• A. Morphology
• B. Aero logy
• C. Geo-morphology
• D. Biology

Explanation: Geomorphology combines the study of Earth with the study of forms, so it examines how present and past landscapes were formed. Morphology is the general study of form and is not limited to landforms.

247. Isobars are the lines connecting the places having same:___________?

• A. Pressure
• B. Rainfall
• C. Height
• D. Temperature

Explanation: Isobars are lines on a weather map joining places with equal atmospheric pressure. Equal-temperature lines are called isotherms, so temperature is the common trap.

248. The top atmosphere of the Earth directly reflects back into space nearly what part of the total amount of sun's energy coming to it?

• A. 10%
• B. 20%
• C. 30%
• D. 50%Chemistry

Explanation: Earth's atmosphere, clouds, and surface reflect roughly 30% of incoming solar radiation back to space, an amount called Earth's albedo. The remaining energy is absorbed by the atmosphere and surface or otherwise redistributed.

249. An example of an abiotic component __________?

• A. Plants
• B. Soil
• C. Animals
• D. Bacteria

Explanation: Soil is abiotic, meaning it is a non-living part of an ecosystem, although it supports living organisms. Plants, animals, and bacteria are biotic components because they are living.

250. Pollutants that are introduced into the environment by human activity are called as ___________?

• A. Qualitative pollutants
• B. Quantitative pollutants
• C. Anthropogenic pollutant
• D. All of Above

Explanation: Pollution caused by human activities is described as anthropogenic pollution, from Greek roots meaning human-made. Qualitative and quantitative describe kinds or amounts of pollutants, not their human origin.