Related Questions

which one among the following is responsible for formation of 'Ozone Holes' in the stratosphere?
A Chloro Fluoro Carbons
B Benzopyrene
C Hydrocarbons
D UV radiation
which one among the following is responsible for formation of 'Ozone Holes 'in the stratosphere?
A Chloro Fluoro Carbons
B Bnropyrene
C Hydrocarbons
D UV radiation
What does the underlined word mean in the following sentence?The old man's house, badly in need of paint, was leaning to one side and had holes in the roof, but one side and had holes in the roof, but
A poorly built
B old-fashioned
C run down
D dirty
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?
A Doping
B Valence electrons
C Free electrons
D Thermal energy
E None of the above
Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
A Chlorofluorocarbons
B Nitrous oxide
C Sulphur dioxide
D Carbon dioxide
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
Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?
A Nitrous oxide
B Carbon dioxide
C Chlorofluorocarbon
D Sulphur dioxide
_________ is the first country to have phased out the CFCs and HCFCs which are responsible for the depletion of the ozone layer.
A Denmark
B Germany
C France
D Spain
Formation of pot holes in river beds is an example of ________
A Hydration
B Erosion
C Corrosion
D Attrition
The depletion in Ozone layer is caused by ________ .
A Nitrous oxide
B Carbon dioxide
C Chlorofluorocarbons
D Methane

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