Q. The gas, which comes out on opening a soda water bottle, is -
1) carbon dioxide
2) hydrogen
3) nitrogen
4) sulfur dioxide
Q. The ore of Aluminium is -
1) Hematite
2) Bauxite
3) Fluorspar
4) Chalco pyrites
Q. Heavy metals got their name because compared to other atoms they have -
1) Higher atomic masses
2) Higher densities
3) Higher atomic numbers
4) Higher atomic radii
Q. Photo chemical smog is a resultant of the reaction among -
1) High concentration of NO2, O3 and CO in the evening
2) NO2,03 and peroxy acetyl nitrate in the presence of Sun-light
3) CO, CO2 and NO2 at low temperature
4) CO, O2 and peroxy acetyl nitrate in the presence of Sunlight
Q. When a helium atom loses an electron it becomes -
1) A proton
2) A positive helium ion
3) A negative helium ion
4) An alpha particle
Q. Cyanide poisoning causes death in seconds because -
1) It breaks the electron transport chain
2) It denatures enzymes of the heart/muscle
3) It causes cardiac arrest
4) It causes Lysis of red blood cells
Q. Acid rain is formed due to contribution from the following pair of gases -
1) Methane and ozone
2) Oxygen and nitrous oxide
3) Methane and sulpher dioxide
4) Carbon dioxide and sulpher dioxide
Q. The concentration of which gas is highest in our environment ?
1) Oxygen
2) Hydrogen
3) Nitrogen
4) Carbon dioxide
Q. Air is composed of gases, water vapours and -
1) dust particles
2) rainfall
3) snowfall
4) light
Q. Which of the following is in liquid form at room temperature ?
1) Lithium
2) Sodium
3) Francium
4) Cerium
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