Chemistry Class 10 Chapter 14 Important MCQs Federal Board

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


Class 10 Chemistry free pdf notes are available for download as follows:

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