April 1, 2019

Chemistry McQ for WBCS Main 2019

1. Ozone depletion in the atmosphere is mainly caused by
(1) sulphur dioxide
(2) nitrogen dioxide
(3) hydrogen sulphide
(4) chlorofluorocarbon

2. Which of the following metals occurs in free state ?
(1) Copper
(2) Iron
(3) Zinc
(4) Lead

3. Copper is refined by
(1) roasting
(2) oxidation
(3) electrolysis
(4) zone refining

4. Which one of the following is used as preservative for foodstuff ?
(1) Sodium Benzoate
(2) Picric acid
(3) Glycerine
(4) Sodium

5. The element with highest first ionisation energy is
(1) hydrogen
(2) helium
(3) lithium
(4) sodium

6. Carbon dioxide is
(1) a reducing agent
(2) an oxidising agent
(3) a dehydrating agent
(4) a bleaching agent

7. An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is
(1) 17
(2) 19
(3) 36
(4) 53

8. Seaweeds are important source of
(1) fluorine
(2) chlorine
(3) bromine
(4) iodine

9. The resources which can be used
continuously, year-after -year are called
(1) Biotic
(2) Abiotic
(3) Non-renewable
(4) Renewable

10. Refrigerators keep food unspoiled
because
(1) at its low temperature, bacteria and moulds are inactive
(2) at its low temperature, the germs are killed
(3) at its low temperature, the germs are frozen
(4) it sterilises the food


Ans :-
   1) 4
   2) 4
   3) 1
   4) 1
   5) 2
   6) 1
   7) 2
   8) 4
   9) 4
  10) 1

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