Chemistry MCQs Online Quiz Test 21

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Chemistry Online Public Service Commission MCQs

Q.1: Which of the following is used as water disinfectant to avoid the formation of toxic compounds———?

  1. Cl2
  2. O3
  3. ClO2
  4. both B And C


Q.2: Ozone hole is substantial depletion of ozone in every year during———?

  1. Aug – Nov
  2. Sep – Nov
  3. Nov – Dec
  4. Dec – Jan


Q.3: Which of the following solutions of H2SO4 is more concentrated ?

  1. 1 Molar solution
  2. 1 molal solution
  3. 1 normal solution
  4. all have same concentration


Q.4: Newspaper can be recycled again and again how many times ?

  1. 2
  2. 3
  3. 4
  4. 5


Q.5: The main pollutant of leather tanneries in the waste water is———-?

  1. chromium III
  2. chromium IV
  3. chromium V
  4. chromium VI


Q.6: Which substance can be used for disinfecting water ?

  1. KMnO4
  2. Alums
  3. Ozone
  4. All Of Above


Q.7: Which one of the following makes the bulk of hydrospheres content ?

  1. oceans
  2. glaciers And icecaps
  3. fresh water lakes and ponds
  4. All have equal distribution


Q.8: The percentage of suspended solid waste in raw water is removed by coagulation is———?

  1. 60
  2. 70
  3. 80
  4. 90


Q.9: The main product of bacterial action is———?

  1. Nox
  2. NO2
  3. N2O3
  4. NO


Q.10: Pollutants have adverse effect over———?

  1. Biosphere
  2. Ecosystem
  3. Both a And b
  4. Hydrosphere