Free Environment and Atmosphere MCQs with Answers

111. Atmospheric pressure decrease rapidly with altitude because the air becomes_______ ?

• A. Colder
• B. Less denser
• C. Rich in Ozone
• D. Warmer

Explanation: Air pressure falls with altitude because the air becomes less dense and the weight of the air column above decreases. Cooling or ozone enrichment is not the main reason.

112. When did Amnesty International won the Noble Prize:

• A. 1917
• B. 1967
• C. 1977
• D. 1987Educational Resources

Explanation: Amnesty International received the Nobel Peace Prize in 1977 for its work defending human rights and opposing torture and political repression.

113. A point directly below the sesmic focus is?

• A. Cleft
• B. Epicentre
• C. Incentre
• D. Orthocentre

Explanation: The epicentre is the point on Earth’s surface directly above the seismic focus, where an earthquake begins underground. The other terms are geometrical centres or unrelated terms.

114. The lowest temperature ever recorded on the Earth is?

• A. -89.2 °C
• B. -86.2 °C
• C. -83.2 °C
• D. -92.2 °C

Explanation: The officially recognised lowest air temperature recorded at Earth’s surface is −89.2 °C at Vostok Station, Antarctica, on 21 July 1983. Satellite measurements have found colder surface temperatures, but this is the standard weather-record value.

115. The process by which air flows from one location in the atmosphere to another is called __________?

• A. Convection
• B. Radiation
• C. Conduction
• D. Electromagnetic Induction

Explanation: Atmospheric air moves because unequal heating creates density differences and convection currents. Radiation transfers energy, while conduction transfers heat through contact rather than moving air from place to place.

116. What percentage of earth's water supply is fresh water___________?

• A. 3%
• B. 5%
• C. 21%
• D. None of these

Explanation: Only about 2.5 to 3% of Earth’s water is fresh water; most of the remainder is saline ocean water. Thus 3% is the standard rounded figure.

117. Permissible noise level at Residential area during night time is:

• A. 45 dB
• B. 55 dB
• C. 75 dB
• D. 80 dB

Explanation: The commonly cited permissible residential noise limit during nighttime is 45 dB, lower than the daytime limit because quiet is more important for sleep. Exact legal limits can vary by country and regulation.

118. An edible underground stem is?

• A. Ginger
• B. Sweet-potato
• C. Sugarcane
• D. Radish

Explanation: Ginger is an underground stem called a rhizome, with buds and scale leaves. Sweet potato and radish are modified roots, while sugarcane has an above-ground stem.

119. _________ is psychological study of values and moral principles?

• A. Axiology
• B. Sociology
• C. Idiology
• D. Criminology

Explanation: Axiology is the branch of philosophy that studies values, including ethical and moral principles. Sociology studies society, while criminology studies crime.

120. Which of these fruits develop from an inflorescence?

• A. Apple
• B. Guava
• C. Pineapple
• D. Grape

Explanation: Pineapple is a multiple fruit formed by the fusion of many flowers in an inflorescence. Apple, guava and grape develop from individual flowers, although apple is an accessory fruit.