1. . The ratio of water on our planet as compared to dry land is
(A) 75%
(B) 76%
(C) 77%
(D) 78%
2. . The percentage of hydrogen to oxygen in water is
(A) 11.11 & 88.89
(B) 12 & 88
(C) 13 & 87
(D) 10 & 90
3. . The bond angle between H–O–H is
(A) 104.3°
(B) 104.2°
(C) 104.4°
(D) 104.5°
4. . The most and readily soluble gas in water is
(A) N2
(B) CO
(C) O2
(D) CO2
5. . The water used in the boiler is
(A) Heavy water
(B) Hard water
(C) Common water
(D) Soft water
6. . 1 PPM is equal to mg/L
(A) 1
(B) 2
(C) 3
(D) 4
7. . The isolation of salts from the sea water is called
(A) Desalination
(B) Salivation
(C) Salts
(D) Salinity
8. . The chemical name of water is
(A) Hydrogen oxide
(B) Hydroxide
(C) Hydrogen peroxide
(D) Hydrogen di oxide
9. . The alternate name for the zeolite method is
(A) Permutit method
(B) Anion process
(C) Caustic soda process
(D) Cation process
10. . The formula of cation exchange resin is
(A) RH3
(B) RH2
(C) R(OH)2
(D) R(OH)3
11. . The insoluble impurities that stick firmly to the inner walls of the boiler tubes is called
(A) Sludge
(B) Scale
(C) Silica
(D) All three
12. . The insoluble impurities that remain suspended in the inner walls of the boiler tubes and do not settle down are called
(A) Scale
(B) Sludge
(C) Silica
(D) All three
13. . Used for the internal treatment of scales in boiler
(A) All three
(B) Phosphate conditioning
(C) Calgon conditioning
(D) Colloidal conditioning
14. . Prevention of ______ is most obligatory because it is directly responsible for soil infertility and indirectly for air pollution
(A) Salinity
(B) Soluble salts
(C) Hardness
(D) Pollution
15. . The sewage treatment can be done by the following methods
(A) All three
(B) Secondary treatment
(C) Tertiary treatment
(D) Primary treatment
16. . To make seawater fit for domestic use it is made pure by the following steps
(A) Sedimentation & Filtration
(B) Desalination
(C) Sterilisation
(D) All three
17. . Certain coagulating chemicals are used to separate suspended impurities in the sea water like
(A) Lime
(B) Alums & Ferric chloride
(C) Silica
(D) Oxygen
18. . The water used in the boiler is usually made soft by the method
(A) Zeolite
(B) Soda ash
(C) Lime soda
(D) All these three
19. . For the treatment of sewage water a huge amount of ______ is required
(A) O
(B) CO2
(C) CO
(D) O2