Problem 1
Which among these gives the measure of organic pollution in water? (a) COD (b) DO (c) \(\mathrm{pH}\) (d) salinity
Problem 4
Which statement is correct about biodegradable materials? (a) these are toxic in nature (b) these can be broken down by bacteria (c) these are used for converting waste to greenery (d) these spoil the biological environment
Problem 5
Fluoride in water is removed using precipitation method by (a) lime and alum (b) lime, alum and bleaching powder (c) activated carbon (d) defluoron
Problem 6
DDT is (a) a non degradable pollutant (b) a fertilizer (c) an antibiotic (d) dichloro difluoro titanium
Problem 7
Cyclon collector is used for minimizing (a) water pollution (b) sound pollution (c) soil pollution (d) air pollution
Problem 8
In Antarctica, ozone depletion is due to the formation of compound. (a) \(\mathrm{SO}_{2}\) and \(\mathrm{SO}_{3}\) (b) chlorine nitrate (c) acrolein (d) (d) formaldehyde
Problem 9
Household fuel (LPG) mainly contains (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{2}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{10}\)
Problem 10
\(\mathrm{CFCl}_{3}\) is responsible for the decomposition of ozone into oxygen. Which of the following reacts with ozone to form oxygen? (a) \(\mathrm{Cl}_{2}\) (b) \(\mathrm{Cl}^{-}\) (c) \(\mathrm{F}^{-}\) (d) \(\mathrm{Cl}^{*}\)
Problem 11
Biosphere includes (a) plants and animals (b) rocks and minerals (c) atmosphere and lithosphere (d) water sources
Problem 12
The major components of the atmosphere are (a) \(\mathrm{CO}_{2}\) and \(\mathrm{N}_{2}\) (b) \(\mathrm{O}_{3}\) and \(\mathrm{SO}_{2}\) (c) \(\mathrm{CO}\) and \(\mathrm{CO}_{2}\) (d) \(\mathrm{N}_{2}\) and \(\mathrm{O}_{2}\)
