Lakshya Education MCQs

Question: Q. Consider the following statements

  1. Water Vapour absorbs not only the long-wave terrestrial radiation but also a part of the incoming solar radiation.

  2. Water vapour is a variable gas in the atmosphere, which increases with altitude.


Which of the statements given above is/are correct?
Options:
A.1 only 
B.2 only
C.Both 1 and 2
D.Neither 1 nor 2
Answer: Option A
: A

Explanation:

Statement 1 is correct. Water Vapour absorbs not only the long-wave terrestrial radiation (infrared or heat emitted by earth during nights), but also a part of the incoming solar radiation. It is an important component of the atmosphere. If not for water vapour, the Earth will not receive rain as rain is condensation of water vapour.

Statement 2 is incorrect. Water vapour is also a variable gas in the atmosphere, which decreases with altitude. In the warm and wet tropics, it may account for four per cent of the air by volume, while in the dry and cold areas of desert and polar regions, it may be less than one per cent of the air.

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More Questions on This Topic :

Question 1. Q. The eye of a cyclone is characterized by-

  1. Calm weather 

  2. Torrential rain

  3. Light winds 

  4. Cloudy skies


Select the correct answer using the code given below
  1.    1, 2 and 4 only 
  2.    2 and 4 only   
  3.    ​​​​​​​1 and 3 only 
  4.    1, 2 and 3 only
Answer: Option C
: C

Explanation:

Statement 1 and 3 are correct:
Eye of a Cyclone:
  1. A mature tropical cyclone is characterised by the strong spirally circulating wind around the centre which is called the eye.
  2. The eye is an area with calm weather and descending air.
  3. It is characterized by light winds and clear skies.
Statement 2 and 4 are incorrect: Around the eye is the eyewall, where there is a strong spiralling rise of air to a greater height reaching the tropopause. The wind reaches maximum velocity in this region and torrential rain occurs here. The skies will be cloudy.
Question 2. Q. Consider the following statements regarding Air Mass

  1. The air with distinctive characteristics in terms of temperature and humidity is called an Air Mass. 

  2. The interaction of cold and warm air mass leads to frontogenesis. 


Which of the statements given above is/are incorrect?
  1.    1 only 
  2.    2 only
  3.    Both 1 and 2
  4.    Neither 1 nor 2
Answer: Option D
: D

Explanation :

Statement 1 is correct: When the air remains over a homogenous area for a sufficiently long time, it acquires the characteristics of the area. The homogenous regions can be the vast ocean surface or vast plains. Air mass is defined as a large body of air having little horizontal variation in temperature and humidity. The homogeneous surfaces, over which air masses from are called the source regions.

Statement 2 is correct: When two different air masses meet, the boundary zone between them is called a front. The process of formation of the fronts is known as frontogenesis. There are four types of fronts: (a) Cold; (b) Warm; (c) Stationary; (d) Occluded. Extra tropical cyclones form along the polar front.
Question 3. Q. Poljes, Uvalas and Dolines are often associated with which one of the following landforms?
  1.    Aeolian erosional landforms
  2.    Karst Topography
  3.    Fluvial lowland landforms
  4.    Landforms of highland glaciation
Answer: Option B
: B

Explanation:

Poljes, Uvalas, Dolines and Grikes are kind of Karst Topography. Any limestone or dolomitic region showing typical landforms produced by the action of groundwater through the processes of solution and deposition is called Karst topography.
When a number of swallow holes coalesce, a larger hollow is formed called a Doline . Several dolines may merge as a result of subsidence (gradual caving) to form an even larger depression called an Uvula . In Yugoslavia, some very large depressions called Polje may be as large as 100 square miles, but produced partly due to faulting.
Question 4. Q. Due to which among the following reasons, the westerlies blow with much greater force in the southern hemisphere in comparison to the northern hemisphere?
  1.    The coriolis force is maximum in the southern hemisphere as compared to the northern hemisphere. 
  2.    There is more ocean and less land in the southern hemisphere in comparison to the northern hemisphere. 
  3.    Due to the presence of InterTropical Convergence Zone and Trade Winds in the southern hemisphere. 
  4.    The highest peaks such as the Everest, K2 are all located in the northern hemisphere which blocks the free flow of wind.
Answer: Option B
: B

Explanation:

In the southern hemisphere, there is more ocean and less land in comparison to the northern hemisphere. Due to this reason, the Westerlies blow with much greater force in the southern hemisphere in comparison to the northern hemisphere as there is less surface friction in the southern hemisphere. Higher the friction less the wind velocity.
Question 5. Q. Consider the following statements regarding Terrestrial Planets:

  1. They have a thick atmosphere, mostly of helium and hydrogen.

  2. Terrestrial planets are made up of rock and metals and have relatively high densities.


Which of the above statements is/are incorrect?
  1.    1 only
  2.    2 only 
  3.    Both 1 and 2
  4.    Neither 1 nor 2
Answer: Option A
: A

Explanation:

Statement 1 is incorrect. Not terrestrial, but Jovian planets have thick atmosphere, mostly of helium and hydrogen. The terrestrial planets are rich in heavier gases and gaseous compounds, such as carbon dioxide, nitrogen, oxygen, ozone, and argon and the atmosphere is not thick.

Statement 2 is correct. Terrestrial planets are made up of rock and metals and have relatively high densities. Such planets have common surface features, which include canyons, craters, mountains, volcanoes and other similar structures, depending on the presence of water and tectonic activity.

Note: The Jovian planets are Jupiter, Saturn, Uranus, and Neptune. These planets have no solid surfaces and are essentially large balls of gas composed primarily of hydrogen and helium.
Question 6. Q. Consider the following statements:

  1. In places where the coasts are extremely mountainous, the continental shelves are generally very wide.

  2. The continental shelves are the shallowest part of the ocean.


Which of the statement(s) given above is/are correct?
  1.    1 only
  2.    2 only
  3.    Both 1 and 2
  4.    Neither 1 nor 2
Answer: Option B
: B

Explanation:

Statement 1 is incorrect: Where the coasts are mountainous, such as the Rocky Mountain and the Andean coasts, the continental shelf may be entirely absent or very small. These mountains are the result of plate’s subduction.

Statement 2 is correct: The continental shelf is the stretched margin of all continents into the ocean. It is the shallowest part of the ocean. The shallowness of continental shelves enables sunlight to penetrate through the water, which encourages plankton growth. These areas also get nutrients from the land. They are also the richest fishing grounds in the world.

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