Related Questions

The ozone layer is being destroyed by chlorofluorocarbons. In this regard which do you consider as the most harmful?
A Carbon atom
B Chlorine atom
C Fluorine atom
D The entire compound
Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A Solar ultraviolet radiation
B Solar infrared radiation
C CO2 in the air
D SO2 in the air
CFC releases a chemical which is harmful to ozone is
A chlorine
B fluorine
C N2O
D SO2
The current drawn by the line due to corona losses is
A Non-sinusoidal
B Sinusoidal
C Triangular
D Square
Why does the ionosphere of the Earth's atmosphere facilitate radio communication? i. The presence of ozone causes the reflection of radio waves to earth ii. Radio waves have a very long wavelength
A i only
B ii only
C both i & ii
D neither i nor ii
The presence of ozone in the stratosphere is responsible for
A Increasing the average global temperature in recent years
B Higher rate of photosynthesis
C Checking the penetration of ultraviolet rays to the earth
D Supplying oxygen for people travelling in jets
Presence of high concentration of ozone and smog in atmospheric air causes the
A Embrittlement & decrease of folding resistance of paper
B Cracking of rubber products
C Fading of dye on textiles
D Damage of electrical insulator on high tension power line
Select the quotation word or phrase that needs correction. 'Many' people have stopped to 'smoke because' they are afraid that it 'may be' harmful to their health.
A many
B smoke
C because
D may be
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
A Hydrogen
B Carbon dioxide
C Ozone
D None of these
Detonation is harmful due to
A Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
B Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
C High intensity of knock causes crankshaft vibration and the engine runs rough
D None of the above

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