Free Environment and Atmosphere MCQs with Answers

71. Who keeps blind snakes as their pets?

• A. Woodcutters
• B. Eagles
• C. Parrots
• D. Owls

Explanation: Burrowing owls bring blind snakes into their underground nests, where the snakes help consume insect larvae and other small prey. This unusual relationship is popularly described as the owl keeping the snakes as pets.

72. Composition of Ozone layer?

• A. O1
• B. O2
• C. O3
• D. O4

Explanation: Ozone is a molecule made of three oxygen atoms, so its chemical formula is O3. Ordinary oxygen gas is O2, which is why O2 is not the composition of the ozone layer.

73. Where do the Prime Meridian and the equator intersect each other point?

• A. Arabian Peninsula
• B. Malacca Strait
• C. Gulf of Guinea
• D. All of These

Explanation: The Prime Meridian is 0° longitude and the equator is 0° latitude; their intersection lies in the Gulf of Guinea off the west coast of Africa. It is not on the Arabian Peninsula or in the Malacca Strait.

74. The main factor for determining a region's climate is ___________?

• A. Latitude
• B. Temperature
• C. Longitude
• D. None of them

Explanation: Latitude strongly controls climate because it determines the angle and intensity of incoming sunlight. Temperature is an element of climate, while longitude has comparatively little direct effect.

75. Pomology is the study of: _________?

• A. Mind
• B. Bones
• C. Fruits
• D. Birds

Explanation: Pomology is the branch of horticulture concerned with the cultivation and study of fruit and fruit trees. The word is derived from terms related to fruit.

76. As we go higher into the atmosphere, the air becomes?

• A. Thinner
• B. Denser
• C. Warmer
• D. Visible

Explanation: Air pressure and density decrease with altitude because there is less overlying air pressing down. This makes high-altitude air thinner, not denser or visibly different.

77. Which metal pollute the air of a big city?

• A. Copper
• B. Chromium
• C. Lead
• D. Cadmium

Explanation: Lead pollution in cities has historically come mainly from vehicle exhaust using leaded petrol, as well as industrial emissions and dust. Lead is toxic and can damage the nervous system, especially in children.

78. Which of the gas is not known as green house gas?

• A. Methane
• B. Nitrous oxide
• C. Carbon dioxide
• D. Hydrogen

Explanation: Methane, nitrous oxide and carbon dioxide absorb outgoing infrared radiation and are greenhouse gases. Hydrogen is not normally classified as a primary greenhouse gas in basic atmospheric science.

79. Weather and climate are driven by what source(s) of energy ?

• A. Earth's internal heat
• B. Solar radiation
• C. Gravity
• D. Both (a) and (c)

Explanation: Solar radiation supplies almost all the energy driving weather and climate by heating Earth's surface and atmosphere unevenly. Earth's internal heat and gravity influence some processes but are not the main energy source.

80. Volcanoes can also be caused by _____ so called 'hot spots'.

• A. Ash
• B. Gases
• C. Mantle Plumes
• D. None of these

Explanation: Mantle plumes are columns of unusually hot, rising mantle material that can melt through the crust and produce volcanoes away from plate boundaries. These volcanic regions are called hotspots.