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NCERT Class 11 Geography Chapter 8 Composition and Structure of Atmosphere
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. CBSE Class 11 Geography Solutions are part of All Subject Solutions. Here we have given NCERT Class 11 Geography Part I: Fundamentals of Physical Geography, Part II: Indian: Physical Environment, Part III: Practical Work in Geography. NCERT Class 11 Geography Chapter 8 Composition and Structure of Atmosphere Notes, NCERT Class 11 Geography Textbook Solutions for All Chapters, You can practice these here.
Composition and Structure of Atmosphere
Chapter: 8
GEOGRAPY [ PART – I ]
TEXTUAL QUESTIONS ANSWERS
OBJECTIVE TYPE QUESTIONS
I. Fill in the blanks:
(i) There are _____________ layers in the atmosphere.
Ans. Five.
(ii) The weather phenomena takes place in _____________.
Ans. Troposphere.
(iii) The lowermost layer of the atmosphere is _____________.
Ans. Troposphere.
(iv) The topmost layer of the atmosphere is _____________.
Ans. Exosphere.
(v) The aeroplanes get high speed in the _____________.
Ans. Stratosphere.
II. Match the items of list A with the items of list B.
| A | B |
| (i) Nitrogen | (a) 20.94 |
| (ii) Oxygen | (b) 0.93 |
| (iii) Argon | (c) 0.0005 |
| (iv) Carbon dioxide | (d) 78.08 |
| (v) Helium | (e) 0.03 |
Ans.
| A | B |
| (i) Nitrogen | (d) 78.08 |
| (ii) Oxygen | (a) 20.94 |
| (iii) Argon | (b) 0.93 |
| (iv) Carbon dioxide | (e) 0.03 |
| (v) Helium | (c) 0.0005 |
III. Multiple choice questions:
1. The atmosphere has layers?
(a) Five.
(b) Three.
(c) Two.
(d) Four.
Ans. (a) Five.
2. Ozone layer lies within the:
(a) stratosphere.
(b) troposphere.
(c) ionosphere.
(d) tropopause.
Ans. (a) stratosphere.
3. The ultra-violet rays of the sun are reflected by:
(a) ozone layer.
(b) water vapour.
(c) dust particles.
(d) none.
Ans. (a) ozone layer.
4. The normal lapse rate of temperature in troposphere is :
(a) 0.65°C per 100 metre.
(b) 1°C per 165 meter.
(c) -45°C per 100 metre.
(d) none of them.
Ans. (b) 1°C per 165 meter.
5. Which one of the following gases constitutes the major portion of the atmosphere?
(a) Oxygen.
(b) Nitrogen.
(c) Argon.
(d) Carbon dioxide.
Ans. (b) Nitrogen.
6. Atmospheric layer important for human beings is:
(a) Stratosphere.
(b) Mesosphere.
(c) Troposphere.
(d) Ionosphere.
Ans. (c) Troposphere.
7. Sea salt, pollen, ash, smoke soot, fine soil-these are associated with:
(a) Gases.
(b) Dust particles.
(c) Water vapour.
(d) Meteors.
Ans. (b) Dust particles.
8. Oxygen gas is in negligible quantity at the height of atmosphere:
(a) 90 km.
(b) 120 km.
(c) 100 km.
(d) 150 km.
Ans. (b) 120 km.
9. Which one of the following gases is transparent to incoming solar radiation and opaque to outgoing terrestrial radiation?
(a) Oxygen.
(b) Nitrogen.
(c) Helium.
(d) Carbon dioxide.
Ans. (d) Carbon dioxide.
10. It is an element of atmosphere
(a) Tides.
(b) Pressure.
(c) Water currents.
(d) Waves.
Ans. (b) Pressure.
11. Which gas is opaque to the outgoing terrestrial radiation?
(a) Dust particles.
(b) Ozone.
(c) Carbon dioxide.
(d) Water vapour.
Ans. (c) Carbon dioxide.
12. The uppermost layer of the atmosphere is
(a) Mesosphere.
(b) Exosphere.
(c) Ionosphere.
(d) Stratosphere.
Ans. (b) Exosphere.
13. Which one of the following gases constitutes the major portion of the atmosphere?
(a) Oxygen.
(b) Nitrogen.
(c) Argon.
(d) Carbon dioxide.
Ans. (b) Nitrogen.
14. Which of the following gases absorbs ultraviolet rays?
(a) Carbon dioxide.
(b) Neon.
(c) Ozone.
(d) Nitrogen.
Ans. (c) Ozone.
15. Excess carbon dioxide in the atmosphere due to pollution will cause
(a) Earth’s temperature to rise.
(b) Earth’s temperature to fall.
(c) Decrease in weather phenomenon.
(d) Ozone layer to become thicker.
Ans. (a) Earth’s temperature to rise.
16. Which zone separates the troposphere from the stratosphere?
(a) Mesospause.
(b) Tropopause.
(c) Ionospause.
(d) Stratopause.
Ans. (b) Tropopause.
17. The increase in the volume of carbon dioxide for the past few decades is mainly due to
(a) deforestation.
(b) climate change.
(c) atmospheric composition.
(d) burning of fossil fuels.
Ans. (d) burning of fossil fuels.
18. What envelopes the earth all round?
(a) Hydrosphere.
(b) Lithosphere.
(c) Atmosphere.
(d) Biosphere.
Ans. (c) Atmosphere.
19. The radiations that heat earth’s atmosphere, comes from the
(a) Sun.
(b) Earth.
(c) Ionosphere.
(d) Sun and Earth.
Ans. (b) Earth.
20. The air is an integral part of the earth’s mass and 99 per cent of the total mass of the atmosphere is confined to the height of how many km from the earth’s surface?
(a) 10 km.
(b) 12 km.
(c) 24 km.
(d) 32 km.
Ans. (d) 32 Km.
