Q. Which of the following radioactive substances enters/ enter the human body through food physiological disorders?
1) Strontium-90
2) lodine-131
3) Cesium-137
4) All of the above
Q. The foul smell of urine of a healthy man having healthy food, when spilled on floor, is mainly due to the bacterial decomposition of -
1) Urea into sulphur dioxide
2) sugar into carbon dioxide
3) lipids into methane
4) urea into ammonia
Q. Desalination of seawater is done by using reverse osmosis. The pressure applied to the solution is -
1) larger than osmotic pressure
2) smaller than osmotic pres-sure
3) equal to osmotic pressure
4) equal to atmospheric pressure
Q. Which one of the following polymers does not contain glucose units?
1) Glycogen
2) Starch
3) Cellulose
4) Rubber
Q. Tincture o iodine is an antiseptic for fresh wounds. It is a dilute solution of elemental iodine, which does not contain -
1) water
2) acetone
3) alcohol
4) potassium iodide
Q. Among the following fuels of energy, which is the most environment friendly?
1) Biogas
2) CNG
3) Hydrogen
4) Ethanol
Q. Which of the following pollutant gases is not produced both naturally and as a result of industrial activity ?
1) Nitrous oxide
2) Methane
3) Carbon dioxide
4) Chlorofluoro carbons
Q. Bio-fuels are fuels extracted from plants and crops and these have various advantages. These include -
1. increasing agricultural diversity.
2. reduced use of fertilizers.
3. renewable source of energy.
Select the correct answer using the codes given below :
1) 1 and 3 only
2) 3 only
3) 2 and 3 only
4) 1,2 and 3
Q. Brass gets discoloured in air because of the presence of which of the following gases in air?
1) Oxygen
2) Hydrogen sulphide
3) Carbon dioxide
4) Nitrogen
Q. Which one of the following gases dissolves in water to give acidic solution ?
1) Carbon dioxide
2) Oxygen
3) Nitrogen
4) Hydrogen
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