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) 104.4°
(B) 104.2°
(C) 104.3°
(D) 104.5°
4. The most readily soluble gas in water is
(A) CO2
(B) CO
(C) O2
(D) N2
5. The water used in the boiler is
(A) Heavy water
(B) Hard water
(C) Soft water
(D) Common water
6. 1 PPM is equal to mg/L
(A) 1
(B) 2
(C) 3
(D) 4
7. The isolation of salts from sea water is called
(A) Salinity
(B) Salivation
(C) Salts
(D) Desalination
8. The chemical name of water is
(A) Hydroxide
(B) Hydrogen oxide
(C) Hydrogen peroxide
(D) Hydrogen dioxide
9. The alternate name for the zeolite method is
(A) Cation process
(B) Anion process
(C) Caustic soda process
(D) Permutit method
10. The formula of cation exchange resin is
(A) RH2
(B) RH3
(C) R(OH)2
(D) R(OH)3
11. The insoluble impurities that stick firmly to the inner walls of the boiler tubes are called
(A) Scale
(B) Sludge
(C) Silica
(D) All three
12. The insoluble impurities that remain suspended in the boiler water 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) Colloidal conditioning
(B) Phosphate conditioning
(C) Calgon conditioning
(D) All three
14. Prevention of ______ is most obligatory because it is directly responsible for soil infertility and indirectly for air pollution
(A) Pollution
(B) Soluble salts
(C) Hardness
(D) Salinity
15. The sewage treatment can be done by the following methods
(A) Primary treatment
(B) Secondary treatment
(C) Tertiary treatment
(D) All three
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 sea water like
(A) Lime
(B) Silica
(C) Alums & ferric chloride
(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) O2
(C) CO
(D) CO2