1
GATE CE 2002
MCQ (Single Correct Answer)
+1
-0.3
In natural water, hardness is mainly caused by
A
$$Ca^{++}$$ and $$Mn^{++}$$
B
$$Ca^{++}$$ and $$Fe^{++}$$
C
$$Na^{+}$$ and $$K^{+}$$
D
$$Ca^{++}$$ and $$Mg^{++}$$
2
GATE CE 1999
MCQ (Single Correct Answer)
+1
-0.3
Temporary hardness in water is caused by the presence of
A
Bicarbonates of Ca and Mg
B
Sulphates of Ca and Mg
C
Chlorides of Ca and Mg
D
Nitrates of Ca and Mg
3
GATE CE 1998
MCQ (Single Correct Answer)
+1
-0.3
The microbial quality of treated piped water supplies is monitored by
A
Microscopic examination
B
Plate count of heterotrophic bacteria
C
Coliform MPN test
D
Identification of all pathogens
4
GATE CE 1997
MCQ (Single Correct Answer)
+1
-0.3
Alkalinity of water can be defined correctly in one of the following ways
A
it is the measure of ability of water to neutralize oxygen
B
it is the measure of ability of water to neutralize carbonates
C
it is the presence of ions in water that will neutralize hydrogen ions
D
it is the measure of ability of water to neutralize hydroxides
GATE CE Subjects
Fluid Mechanics and Hydraulic Machines
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