How much percentage of nitrogen present in the atmosphere is unreactive?
73
78
75
76
Which of the following oxides are released from industry and which dissolve in rain water to produce 'acidrain'.
Nitrogen and Sulfur
Nitrogen and Silicon
Nitrogen and Phosphorous
Nitrogen and Selenium
Burning of petrol containing which of the following releases this toxic metal into the environment and can cause serious health hazards?
Chromium
Tin
Lead
Selenium
Which of the following gases do termites significantly contribute to the atmosphere?
Methane
NO2
CO2
Water vapour
Which of the following produces carbon dioxide when it is heated in industry and when it moves back below the Earth's crust?
Ore
Fossil fuel
Sediments
Limestone
Which of these renewable resource is used to generate electricity?
Wind energy
Hydel energy
Solar power
All of the above.
Plants use carbon dioxide for photosynthesis. Animals use it to make their:
Skin
Shells
Cells
Hairs
Which of the following is caused by gases in the air, chiefly carbon dioxide and methane?
Photochemical smog
Acid rain
Global warming
Denitrification
Which type of water is made drinkable by desalination?
River
Well
Lake
Sea
Glucose + Oxygen → CO2 + H2OWhich process is this ?
Combustion
Photosynthesis
Respiration
Transpiration
