Every question from this NCERT chapter, with a detailed explanation.
Consider the following statements regarding the composition of the atmosphere: 1. The proportion of gases remains constant up to the highest layers of the atmosphere. 2. Nitrogen is the most abundant gas in the atmosphere. 3. Nitrogen and Oxygen make up the bulk of the atmosphere. Which of the statements given above is/are correct?
Which of the following is the main reason for the rising volume of carbon dioxide in the atmosphere?
Consider the following statements regarding water vapour in the atmosphere: 1. It is a variable gas that increases with altitude. 2. It accounts for less than one % of the air by volume in the dry and cold polar regions. 3. It absorbs parts of the insolation from the sun and preserves the earth’s radiated heat. Which of the statements given above is/are correct?
With reference to the composition of the atmosphere, consider the following statements: 1. Oxygen is found in substantial quantities at heights above 120 km from the earth's surface. 2. Carbon dioxide is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation. 3. Carbon dioxide and water vapour are found in uniform concentration up to the exosphere. Which of the statements given above is/are correct?
Which one of the following is the most likely reason for the higher concentration of dust particles in subtropical and temperate regions compared to equatorial regions?
In the context of the structure of the atmosphere, consider the following statements regarding the Troposphere: 1. The temperature in this layer increases with height. 2. Its thickness is greatest at the equator and least at the poles. 3. It is devoid of dust particles and water vapour. Which of the statements given above is/are correct?
With reference to the Tropopause, consider the following statements: 1. It is the zone separating the stratosphere from the mesosphere. 2. The air temperature at the tropopause is about minus 80°C over the equator and about minus 45°C over the poles. 3. The height of the tropopause changes seasonally. Which of the statements given above is/are correct?
Which of the following statements best explains why the troposphere is thickest at the equator?
Consider the following pairs regarding the layers of the atmosphere and their characteristics: 1. Stratosphere : Contains the ozone layer 2. Mesosphere : Temperature increases with altitude 3. Ionosphere : Reflects radio waves back to earth Which of the pairs given above is/are correctly matched?
Which one of the following gases is largely responsible for the greenhouse effect?
With reference to the Mesosphere, consider the following statements: 1. It lies above the thermosphere and extends up to a height of 800 km. 2. In this layer, temperature decreases with the increase in altitude. 3. The upper limit of the mesosphere is known as the mesopause. Which of the statements given above is/are correct?
Consider the following statements regarding the Ionosphere: 1. It is located between 10 and 50 km above the surface. 2. It contains electrically charged particles known as ions. 3. Temperature in this layer increases with height. Which of the statements given above is/are correct?
Which layer of the atmosphere is described as the highest layer where the air is extremely rarefied and gradually merges with outer space?
Consider the following statements regarding the distribution of water vapour: 1. It increases from the equator towards the poles. 2. It decreases with altitude in the troposphere. 3. It acts like a blanket allowing the earth neither to become too cold nor too hot. Which of the statements given above is/are correct?
Which one of the following represents the correct sequence of layers of the atmosphere from the surface upwards?
With reference to the composition of the atmosphere, 99 % of the total mass of the atmosphere is confined to a height of:
Consider the following statements regarding Ozone in the atmosphere: 1. It is found exclusively in the troposphere below 10 km. 2. It acts as a filter and absorbs ultra-violet rays radiating from the sun. 3. Its absence would lead to intense heating of the surface by solar radiation. Which of the statements given above is/are correct?
In the context of atmospheric layers, the "Ionosphere" is a part of which of the following layers?
Consider the following statements: 1. The density of the atmosphere is highest near the surface of the earth. 2. The density of the atmosphere increases with increasing altitude. 3. The column of atmosphere is divided into five layers depending upon the temperature condition. Which of the statements given above is/are correct?
Why is the Troposphere considered the most important layer for all biological activity?
Consider the following statements regarding the temperature at the Tropopause: 1. It is about minus 45°C over the equator. 2. It is about minus 45°C over the poles. 3. The temperature at the tropopause is lower over the equator than over the poles. Which of the statements given above is/are correct?
Which of the following gases is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation?
With reference to the Stratosphere, consider the following statements: 1. It extends up to a height of 50 km. 2. It is devoid of any ozone, which is found only in the troposphere. 3. It is free from clouds and associated weather phenomena. Which of the statements given above is/are correct?
Consider the following statements regarding the vertical distribution of gases: 1. Oxygen is almost negligible at heights above 120 km. 2. Carbon dioxide is found in abundance up to 500 km. 3. Water vapour is found uniformly throughout the atmosphere. Which of the statements given above is/are correct?
Which of the following contributes to the stability and instability in the air?
In the context of the atmosphere, "Hygroscopic nuclei" are primarily associated with:
Which of the following statements is correct regarding the temperature trend in the Mesosphere?
The ionosphere plays a crucial role in long-distance radio communication on Earth primarily because it:
Consider the following statements regarding the Exosphere: 1. It is the lowest layer of the atmosphere. 2. Its contents are extremely rarefied. 3. It has a distinct upper boundary separating it from outer space. Which of the statements given above is/are correct?
With reference to the atmosphere, consider the following statements: 1. Air is colourless and odourless. 2. 99% of the atmosphere's mass is found above 100 km. 3. The atmosphere exists only over the equatorial regions. Which of the statements given above is/are correct?
Which of the following pairs of layers and their upper limits is correctly matched?
Consider the following statements regarding the volume of gases in the atmosphere: 1. The volume of carbon dioxide has remained constant in the past few decades. 2. The volume of other gases (besides CO2) is considered constant. 3. The rise in CO2 is mainly due to the burning of fossil fuels. Which of the statements given above is/are correct?
Consider the following statements regarding the variation of water vapour: 1. In warm and wet tropics, it accounts for less than 0.1 % of the air by volume. 2. In dry and cold areas of desert and polar regions, it may be less than one %. 3. Water vapour decreases from the equator towards the poles. Which of the statements given above is/are correct?
Which of the following statements is correct regarding the "Normal Lapse Rate" in the Troposphere?
Which of the following layers lies between the Mesopause and the Exosphere?
Consider the following statements regarding the role of the atmosphere: 1. It contains life-giving gases like oxygen for humans and carbon dioxide for plants. 2. It allows harmful ultra-violet rays to reach the earth freely. 3. It acts as a blanket to maintain earth's temperature. Which of the statements given above is/are correct?
Which of the following is a variable gas in the atmosphere?
The height of the Troposphere near the poles is approximately:
Which of the following statements explains why the temperature in the Ionosphere starts increasing with height?
Consider the following statements regarding Dust Particles: 1. They are generally concentrated in the upper layers of the atmosphere. 2. Convectional air currents may transport them to great heights. 3. They are found in higher concentrations in equatorial regions due to wet winds. Which of the statements given above is/are correct?
Which of the following statements is correct regarding the temperature at the height of 80 km in the atmosphere?
Which of the following statements is correct regarding the "Ionosphere"?
Consider the following statements regarding the "Exosphere": 1. It is the highest layer of the atmosphere. 2. It is separated from outer space by a distinct boundary called the magnetopause. 3. It contains dense gases. Which of the statements given above is/are correct?
Which of the following characteristics is correctly associated with the mesosphere in the vertical structure of the Earth’s atmosphere?
Consider the following statements regarding the height of the Troposphere: 1. It is 18 km at the equator. 2. It is 18 km at the poles. 3. The variation is due to the transport of heat by convectional currents. Which of the statements given above is/are correct?
In the Earth’s atmosphere, which of the following gases plays a crucial role in filtering harmful ultraviolet radiation from reaching the surface?
With reference to the vertical structure of the atmosphere, which of the following statements correctly describes the temperature conditions at the tropopause?
Which of the following statements regarding the "Stratosphere" is correct?
Consider the following statements regarding the "Mesosphere": 1. It extends up to a height of 12 km. 2. Temperature decreases with altitude. 3. It lies above the Stratosphere. Which of the statements given above is/are correct?
With reference to atmospheric composition, which of the following statements regarding water vapour is correct?
Which of the following layers reflects radio waves back to earth?
Which of the following statements is correct regarding the "Thermosphere"?
Consider the following statements regarding "Carbon Dioxide": 1. It is opaque to incoming solar radiation. 2. It is opaque to outgoing terrestrial radiation. 3. It is found up to 90 km height. Which of the statements given above is/are correct?
Which of the following statements is correct regarding the "Exosphere"?
Consider the following statements regarding the "Troposphere": 1. It contains dust particles. 2. It is devoid of water vapour. 3. It is the most important layer for biological activity. Which of the statements given above is/are correct?
Which of the following statements regarding "Ozone" is correct?