Chemistry Class 10 Chapter 14 Important MCQs
10th Chemistry Federal Board
Chapter 14 The Atmosphere Fbise
1. Dry air consists of __ % Oxygen by volume.
A.78
B.21
C.4
D.0.05
ANSWER: B (21%)
2. The % of Hydrogen in dry air is __.
A.0.00005
B.0.70
C.0.98
D.1.7
ANSWER: A (0.0005%)
3. The air may contain about ___% water vapours.
A.7
B.9
C.4
D.2
ANSWER: C (4%)
4. The atmosphere is divided into __ layers.
A.4
B.14
C.43
D.2
ANSWER: A (4)
5. Which of the following is not a layer of the atmosphere?
A. Troposphere
B. Thermosphere
C. Stratosphere
D. Microsphere
ANSWER: D (Microsphere)
6. Tropo means ____.
A. Turning
B. Moving
C. Running
D. None of them
ANSWER: A (Turning)
7. Troposphere extends to about __ above earth’s surface.
A.17 km
B.90 km
C.45 km
D.12 km
ANSWER: D (12km)
8. Which of the following atmospheric layer is closest to the earth?
A. Mesosphere
B. Troposphere
C. Ionosphere
D. Microsphere
ANSWER: B (Troposphere)
9. The temperature range in troposphere is from __˚C to ___˚C.
A. 17 & -45
B. 14 & -55
C. 17 & -55
D. 14 & -45
ANSWER: C (17& -55)
10. The stratosphere outstretches from the top of the troposphere to about ___ km above the earth’s surface.
A.90
B.50
C.55
D.65
ANSWER: B (50km)
11. Strato means ___.
A. Layer or spread out
B. Versatile
C. Rotating
D. None of them
ANSWER: A Layer or spread out
12. In the stratosphere temperature ranges from ___ ˚C to ___ ˚C.
A.-50 & 5
B. -45 & -5
C. -35 & -10
D. -55 & -5
ANSWER: D (-55 & -5)
13. Stratosphere contains the maximum amount of ___.
A. Fluorine
B. Ozone
C. Oxygen
D. Hydrogen
ANSWER: B (Ozone)
14. For each 1km increase in altitude the air gets about ___ ˚C cooler in the troposphere.
A.7.2
B.6
C.6.5
D.2
ANSWER: C (6.5)
15. The mesosphere outstretches from the top of the stratosphere to about ___ km above the earth’s surface.
A.80
B.70
C.54
D.30
ANSWER: A (80km)
16. Which of the following is the middle layer of the atmosphere?
A. Exosphere
B. Mesosphere
C. Ozonosphere
D. Ionosphere
ANSWER: B (Mesosphere)
17. In the outer mesosphere the temperature decreases to __ ˚C.
A. -90
B. -91
C. -103
D. -93
ANSWER: D (-93)
18. Which layer protects Earth from being hit by meteoroids?
A. Exosphere
B. Mesosphere
C. Microsphere
D. Radiosphere
ANSWER: B (Mesosphere)
19. Thermosphere is the ___ layer of the atmosphere.
A. Outermost
B. Innermost
C. Middle
D. None of them
ANSWER: A (Outermost)
20. Temperature in the thermosphere increases to a maximum of __ ˚C.
A. 1800
B. 2000
C. 2200
D. 1500
ANSWER: A (1800)
21. Thermosphere is further divided into __ layers
A. 5
B. 2
C. 7
D. 9
ANSWER: B (2)
22. The lower layer of the thermosphere is called ___.
A. Ozonosphere
B. Microsphere
C. Infrasphere
D. Ionosphere
ANSWER: D (Ionosphere)
23. The outer layer of the thermosphere is called ___.
A. Ozonosphere
B. Exosphere
C. Ionosphere
D. Infrasphere
ANSWER: B (Exosphere)
24. Those substances which disturb the balance of the environment are called ____.
A. Elements
B. Compounds
C. Pollutants
D. None of them
ANSWER: C (Pollutants)
25. Sulphur dioxide is readily absorbed in the ____ system.
A. Circular
B. Respiratory
C. Nervous
D. Muscular
ANSWER: B (Respiratory)
26. Which of the following causes death if inhaled for a long time?
A. CO2
B. O2
C. CO
D. SO2
ANSWER: C (CO)
27. Which of the following causes global warming?
A. O2
B. CO2
C. N2
D. None of them
ANSWER: B (CO2 )
28. Which of the following is sparingly soluble in water?
A. NO
B. NO2
C. O2
D. C
ANSWER: A (NO)
29. NO2 is a ___ gas.
A. Pink
B. Red
C. Yellow
D. Reddish brown
ANSWER: D (Reddish brown)
30. Which of the following gases are highly toxic gases?
A. Ne, Ar
B. H2, He
C. NO, NO2
D. None of them
ANSWER: C (NO & NO2)
31. Which of the following is an excellent heat absorber?
A. Oxygen
B. Methane
C. Nitrogen
D. Sulphur
ANSWER: B (Methane)
32. Which of the following compounds is attacking the ozone?
A. O2
B. SO2
C. CFCs
D. None of them
ANSWER: C (CFCs)
33. Ozone is a ___ gas.
A. Light blue
B. Red
C. Pink
D. Yellowish
ANSWER: A (Light blue)
34. Which of the following is used as a refrigerant in fridges and air conditioning units?
A. CFCS
B. Oxygen
C. Sulphur dioxide
D. CO2
ANSWER: A (CFCS)
35.___ is produced when electrical discharge passes through oxygen in the air.
A. Oxygen
B. Krypton
C. Xenon
D. Ozone
ANSWER: D (Ozone)
36. Which of the following causes Brain damage and forest decline?
A. Lead compounds
B. CFCs
C. Ozone
D. Nitrogen
ANSWER: A (Lead compounds)
37.____are constructed from glass or transparent polymer films.
A. Castles
B. Green-houses
C. Factories
D. Industries
ANSWER: B (Greenhouses)
38. The rise in the average temperature of the Earth’s atmosphere due to different natural and human activities is called ___.
A. Deforestation
B. Global warming
C. Greenhouse gases
D. None of them
ANSWER: B (Global warming)
39. ph of normal rain is ___
A. 5.6
B. 6.5
C. 5.0
D. 4.3
ANSWER: A (5.6)
40. Rain having ph less than 5.6 is called ___
A. Defected rain
B. Acid rain
C. Sudden rain
D. Actual rain
ANSWER: B (Acid rain)
41. Ozone is an ___ form of oxygen.
A. Different
B. Similar
C. Allotropic
D. Complicated
ANSWER: C (Allotropic)
42. Most of the UV rays coming from sun are filtered by ___.
A. Exosphere
B. Sunroofs
C. Co-factors
D. Ozone layer
ANSWER: D (Ozone layer)
43. The region in which the amount of ozone is reduced is called ___.
A. Hole
B. Ozone hole
C. Sphere
D. Ozone infection
ANSWER: B (Ozone hole)
44. Which of the following is formed when chlorine reacts with ozone?
A. Chlorine monoxide
B. Chlorine trioxide
C. Chlorine dioxide
D. None of them
ANSWER: A (Chlorine monoxide)
45. Metals like Platinum, palladium and rhodium are used as ___ in the converter.
A. Enzymes
B. Reactors
C. Catalyst
D. None of them
ANSWER: C (Catalyst)
10th Class Chemistry Ch 14 pdf
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