1
GATE CE 2022 Set 1
MCQ (More than One Correct Answer)
+1
-0.33

For wastewater coming from a wood pulping industry, Chemical Oxygen Demand (COD) and 5-day Biochemical Oxygen Demand (BOD5) were determined. For this wastewater, which of the following statement(s) is/are correct?

A
COD > BOD5
B
COD $$\ne$$ BOD5
C
COD < BOD5
D
COD = BOD5
2
GATE CE 2022 Set 1
MCQ (More than One Correct Answer)
+1
-0.33

Which of the following processes can be used for conversion of salt water into fresh water?

A
Microfiltration
B
Electrodialysis
C
Ultrafiltration
D
Reverse osmosis
3
GATE CE 2022 Set 1
MCQ (Single Correct Answer)
+1
-0.33

Henry's law constant for transferring O2 from air into water, at room temperature, is 1.3 $${{mmol} \over {liter - atm}}$$. Given that the partial pressure of O2 in the atmosphere is 0.21 atm, the concentration of dissolved oxygen (mg/liter) in water in equilibrium with the atmosphere at room temperature is

(Consider the molecular weight of O2 as 32 g/mol)

A
8.7
B
0.8
C
198.1
D
0.2
4
GATE CE 2022 Set 1
MCQ (Single Correct Answer)
+1
-0.33

In a water sample, the concentrations of Ca2+, Mg2+ and HCO$$_3^ - $$ are 100 mg/L, 36 mg/L and 122 mg/L, respectively. The atomic masses of various elements are : Ca = 40, Mg = 24, H = 1, C = 12, O = 16. The total hardness and the temporary hardness in the water sample (in mg/L as CaCO3) will be

A
400 and 100, respectively.
B
400 and 300, respectively.
C
500 and 100, respectively.
D
800 and 200, respectively.
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