Tag: introduction to the spheres of the earth

Questions Related to introduction to the spheres of the earth

Ozone protects biosphere from high energy _____________.

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Infra-red rays

  2. Ultraviolet rays

  3. X-rays

  4. Gamma rays

  5. Cosmic rays

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Correct Option: B

Ozone layer occurs in

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Mesosphere

  2. Thermosphere

  3. Stratosphere

  4. Troposphere

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Correct Option: C

Stratosphere is characterised by ______________.

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Fall in temperature with height

  2. Lack of water vapours and dust particles

  3. Rise in temperature with height

  4. Both B and C

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Correct Option: A

Ozone layer is found in

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Thermosphere

  2. Stratosphere

  3. Mesosphere

  4. Lithosphere

  5. Troposphere

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Correct Option: B

UV radiations in the stratosphere are absorbed by

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Oxygen

  2. Ozone

  3. Sulphur dioxide

  4. Argon

Show answer
Correct Option: B
Explanation:

The stratosphere is the second layer of the atmosphere. At the equator, it is at the height of 20 km and at poles at 7 km. The stratosphere shows the presence of the ozone layer that has formed due to the reaction of the UV rays with the atmosphere. The ozone so formed in capable of absorbing the UV rays emanating from the sun, including the UV-B which is the most harmful. Due to this absorption, the stratosphere shows the stratification of temperature. The temperature is more towards the upper layers of the atmosphere and less towards the troposphere. 

Hence, the correct answer is 'Ozone'

Atmosphere consists of

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Lithosphere + Hydrosphere

  2. Lithosphere + Stratosphere + Hydrosphere

  3. Troposphere + Stratosphere + Ionosphere

  4. None of the above

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Correct Option: C

Tropopause is

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Lower portion of atmosphere

  2. Upper part of troposphere

  3. Middle part of troposphere

  4. Lower part of troposphere

Show answer
Correct Option: B
Explanation:

The tropopause is the boundary in the Earth's atmosphere between the troposphere and the stratosphere. Therefore it would serve as the upper part of the troposphere. So the correct answer is ' Upper part of troposphere'. 

Ozone layer is located in

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Troposphere

  2. Hydrosphere

  3. Stratosphere

  4. Lithosphere

Show answer
Correct Option: C
Explanation:

Location in Earth's atmosphere. In the midlatitudes, the peak concentrations of ozone occur at altitudes from 20 to 25 km (about 12 to 16 miles). Most of the remaining ozone occurs in the troposphere, the layer of the atmosphere that extends from Earth's surface up to the stratosphere. The Ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth's atmosphere as a whole is about 0.3 parts per million

So the correct answer is 'Stratosphere'.

If there were no atmosphere around the earth, the temperature of the earth will ________.

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Increase

  2. Go on decreasing

  3. Increase during day and decrease during night

  4. Be unaffected

Show answer
Correct Option: C
Explanation:

If there were no atmosphere around the earth, the temperature of the earth will increase during day and decrease during night. In the absence of atmosphere around the earth, it will be like a moon. There would be no life, no winds, no rains, no fires, no protection against harmful solar radiations. Due to absence of atmosphere around the moon, the temperature ranges from -190$^0$C to 110$^0$C. Air is a bad conductor of heat. The atmosphere has an average temperature of the earth almost steady during the day and night. It prevents sudden increase in temperature during the day time. Also, it decreases the rate of escape of heat during night time.

Thus, the correct answer is 'Increase during day and decrease during night.'

Which gas of the atmosphere holds up ultraviolet rays?

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. $O _2$

  2. $O _3$

  3. $N _2$

  4. $CO _2$

Show answer
Correct Option: B
Explanation:
The maximum concentration of ozone gas (O$ _{3}$) is present in the stratosphere region of the earth’s atmosphere. Ozone gas forms a layer in the stratosphere which absorbs the most harmful UV rays also known as UV-C and UV-B. Exposure in UV rays can cause skin cancer, plant tissue damage and other dreadful illness. In the past few years, the ozone layer is depleting rapidly due to excessive use of aerosols, chlorofluorocarbons and other kinds of pollutants. Montreal Protocol in 1987 was signed to control the amount of ozone-depleting substances
So, the correct answer is 'O$ _{3}$'