Atmosphere MCQs

The Earth’s atmosphere is the layer of gases encircling our planet, commonly referred to as air. It is crucial for life on Earth, providing the oxygen we breathe and shielding us from harmful ultraviolet radiation from the sun. The atmosphere also regulates the Earth’s temperature by trapping heat through the greenhouse effect, reducing temperature fluctuations between day and night. It is divided into four main layers, from closest to farthest from the Earth: the troposphere, stratosphere, mesosphere, and thermosphere. The atmosphere primarily consists of three gases: nitrogen (78.09%), oxygen (20.94%), and argon (0.93%), with trace amounts of carbon dioxide (0.04%), methane, and other inert gases. Additionally, air contains water vapor, which varies by location.

Which among the following does not cause pollution?

(a) Automobiles
(b) Thermal power plant
(c) Hydro-electric plant
(d) Nuclear power plant

The term biosphere refers to

(a) Rocks and minerals
(b) Plants and animals
(c) Water sources
(d) Atmosphere and lithosphere

The equipment to measure atmospheric humidity is

(a) Anemometer
(b) Psychrometer
(c) Hydrometer
(d) Lysimeter

The boundary between troposphere and stratosphere is known as

(a) tropopause
(b) ionopause
(c) stratopause
(d) mesopause

The mass of water vapour in a unit mass of air is referred to as

(a) relative humidity
(b) specific humidity
(c) approximate humidity
(d) absolute humidity

Ozone hole is

(a) increase in the concentration of ozone
(b) hole in the ozone layer
(c) depletion of the ozone layer in the troposphere
(d) depletion of the ozone layer in the stratosphere

The ozone layer is present in

(a) Thermosphere
(b) Stratosphere
(c) Troposphere
(d) Mesosphere

If an object is present at a distance of 5 km from the surface of the earth, it is present in

(a) Troposphere
(b) Thermosphere
(c) Mesosphere
(d) Stratosphere

The main constituents of atmosphere are

(a) N₂ and O₂
(b) CO₂ and N₂
(c) CO and CO₂
(d) O₃ and SO₂

The uppermost layer of atmosphere is known as

(a) Ionosphere
(b) Troposphere
(c) Stratosphere
(d) Exosphere