Atmosphere - Study Mode

[#116] A sudden fall in the barometric reading indicates ________
Correct Answer

(B) Storm

Explanation

Solution: If the reading is going down very fast then its an indication of storm (within 5-6 hours) otherwise a slow downfall of reading suggests a low pressure area is passing in a nearby region, and it may rain.

[#117] The amount of actual water vapour of air is known as ________
Correct Answer

(A) Absolute humidity

Explanation

Solution: The actual amount of the water vapour present in the atmosphere is known as the absolute humidity. It is the weight of water vapour per unit volume of air and is expressed in terms of grams per cubic metre. The absolute humidity differs from place to place on the surface of the earth.

[#118] Precipitation takes place when ________
Correct Answer

(A) The sky is overcast with clouds

Explanation

Solution: Option A: The sky is overcast with clouds This option is partly correct . Precipitation is more likely to occur when the sky is overcast with clouds, as clouds contain water droplets or ice crystals that can fall as precipitation when they become heavy enough. Option B: Temperature of moisture in air suddenly increases This option is not correct . An increase in temperature typically leads to the evaporation of moisture rather than precipitation. Option C: Temperature of moisture in air sharply decreases This option is partly correct . Precipitation often occurs when the temperature of moist air decreases, causing the air to reach its dew point and water vapor to condense into liquid or ice, forming precipitation. Option D: Winds begin to blow in a circular motion This option is not correct . The circular motion of winds is associated with weather phenomena like cyclones or hurricanes but is not the primary cause of precipitation. Therefore, the most accurate options related to precipitation are a combination of Option A (The sky is overcast with clouds) and Option C (Temperature of moisture in air sharply decreases) . Precipitation often occurs when the sky is cloudy and the temperature of moist air decreases, leading to condensation and the formation of precipitation.

[#119] Temperate cyclones bring along with them ________
Correct Answer

(D) Mild rainfall

Explanation

Solution: Temperate cyclones bring along with them mild rainfall. Temperate Cyclones also called mid-latitudinal cyclones or extra tropical cyclones are formed due to interaction of air masses of different temperature.

[#120] Choose the correct option with the correct sequence of the layers of atmosphere
Correct Answer

(D) Troposphere, Stratosphere, Mesosphere, Ionosphere, Exosphere

Explanation

Solution: The troposphere is the layer that we live in. The troposphere starts at ground level and extends about 12 km upwards. From about 12 km to 50 km upwards is the stratosphere. In this layer, the jet stream blows strong winds eastward. The mesosphere is the coldest region of Earth’s atmosphere. It’s somewhere close to -100° Celsius. The ionosphere is defined as the layer of the Earth's atmosphere that is ionized by solar and cosmic radiation. It lies 75-1000 km (46-621 miles) above the Earth. The exosphere is the uppermost region of Earth's atmosphere as it gradually fades into the vacuum of space.