Q. What is agent Orange?
1) An ace spying group trained by the police in London
2) A weed-killing chemical used by the US military in the Vietnam War
3) A technique used in the advanced railway safety procedure
4) A special chemical used in making alloy steel
Q. pH value for alkaline solution is always -
1) 7
2) less than 7
3) more than 7
4) None of the above
Q. Which one of the following Black materials has highest carbon content?
1) Charcoal
2) Coal
3) Coke
4) Lampblack
Q. Which state of Cr is most toxic?
1) Cr4+
2) Cr5+
3) Cr6+
4) Cr3+
Q. Hardness of water is due to the presence of -
1) Sodium and chloride ions
2) Calcium and Magnesium ions
3) Strontium and Potassium ions
4) Potassium and Nitrate ions
Q. Which of the following gases in the atmosphere does not fall under the category of 'Greenhouse gases' ?
1) Water vapour
2) CO2
3) CFC
4) O3
Q. Peroxyacetyl nitrate is a -
1) Plant hormone
2) Vitamin
3) Secondary pollutant
4) Acidic dye
Q. The term 'brown air' is used for -
1) Photochemical smog
2) Sulfurous smog
3) Industrial smog
4) Acid fumes
Q. Hydrogen peroxide is an effective sterilizing agent. Which one of the following product results when it readily loses active oxygen ?
1) Water
2) Hydrogen
3) Ozone
4) Nasant Hydrogen
Q. Most commonly used bleaching agent is -
1) Alcohol
2) Carbon dioxide
3) Chlorine
4) Sodium chloride
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