Q. DDT is the name of a chemical that can be used as a/an -
1) Antiseptic
2) Insecticide
3) Antibiotic
4) Fertilizer
Q. Ethanol containing 5% water is known as -
1) Absolute alcohol
2) Dilute alcohol
3) Power alcohol
4) Rectified spirit
Q. The percentage of nitrogen present in ammonia sulphate is -
1) 18%
2) 21%
3) 25%
4) 30.5%
Q. Stains Of rust on clothes can be removed by -
1) H2O2
2) Oxalic acid
3) Petrol
4) Alcohol
Q. Transboundary pollution (or) Acid rain is caused by:
1) Nitrogen oxide and sulphur dioxide
2) Carbon monoxide
3) Carbon dioxide
4) Hydrocarbon
Q. Which of the following is the most dangerous pollutant?
1) Carbon dioxide
2) Sulphur dioxide
3) Carbon monoxide
4) Nitrous oxide
Q. Which of the following is an acid?
1) H2O
2) Na2CO3
3) HZSO4
4) NaCl
Q. The expansion of D.D.T is
1) Dichloro Diphenyl Trichloroethane
2) Dichloro Diamine Trichloroethane
3) Dichloro Diphenyl Tetrachloroethane
4) None of these
Q. In an intrinsic semiconductor, the number of free electrons
1) Equals the number of holes
2) Is less than the umber of holes
3) Is greater than the number of holes
4) Impossible to say
Q. Atomic number of an element gives -
1) The number of protons in its atom
2) The number of nucleons in its atom
3) The weight of the atom of the element
4) The total number of elementary particles in its atom
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