The most important water quality parameter for domestic use of water is carbonat

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Question
The most important water quality parameter for domestic use of water is
Options
A. carbonate hardness
B. non-carbonate hardness
C. coliform group of organisms
D. chlorides

Correct Answer

non-carbonate hardness

GATE Exam Questions problems

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1. A light house of 120 m height is just visible above the horizon from a ship. The correct distance (m) between the ship and the light house considering combined correction for curvature and refraction, is
Options
A. 39.098
B. 42.226
C. 39098
D. 42226

2. While deriving an expression for loss of head due to a sudden expansion in a pipe, in addition to the continuity and impulse-momentum equations, one of the following assumptions is made :
Options
A. Head loss due to friction is equal to the head loss in eddying motion
B. The mean pressure in eddying fluid is equal to the downstream pressure
C. The mean pressure in eddying fluid is equal to the upstream pressure
D. Head lost in eddies is neglected

3. Biochemical oxygen demand (BOD) of waste water is a measure of
Options
A. total concentration of a biochemicals
B. total concentration of organic matter
C. concentration of biodegradable organic matter
D. concentration of chemically oxidisable matter

4. A stable channel is to be designed for a discharge of Q m³ /s with silt factor f as per Lacey's method. The mean flow velocity (m/s) in the channel is obtained by
Options
A. (Qf²/140)^1/6
B. (Qf/140)^1/3
C. (Q²f²/140)^1/6
D. 0.48 (Q/f)^1/3

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