GATE Questions & Answers of Quality standards

What is the Weightage of Quality standards in GATE Exam?

Total 6 Questions have been asked from Quality standards topic of Water and Waste Water subject in previous GATE papers. Average marks 1.67.

A water sample analysis data is given below.

Ion Concentration, mg/L Atomic Weight
$\style{font-family:'Times New Roman'}{\mathrm{ca}^{2+}}$ 60 40
$\style{font-family:'Times New Roman'}{\mathrm{Mg}^{2+}}$ 30 24.31
$\style{font-family:'Times New Roman'}{{\mathrm{HCO}}_3-}$ 400 61
The carbonate hardness (expressed as mg/L of CaCO3, up to one decimal place) for the water sample is ______

The hardness of a ground water sample was found to be 420 mg/L as CaCO3. A softener containing ion exchange resins was installed to reduce the total hardness to 75 mg/L as CaCO3 before supplying to 4 households. Each household gets treated water at a rate of 540 L/day. If the efficiency of the softener is 100%, the bypass flow rate (expressed in L/day) is _________

A sample of water has been analyzed for common ions and results are presented in the form of a bar diagram as shown.;

The non-carbonate hardness (expressed in mg/L as CaCO3) of the sample is

A water sample has a pH of 9.25. The concentration of hydroxyl ions in the water sample is

Anaerobically treated effluent has MPN of total coliform as 106/100 mL. After chlorination ,the MPN value declines to 102/100mL. The percent removal(%R) and log removal (log R) of total coliform MPN is

Chlorine gas(8 mg/L as Cl2) was added to a drinking water sample. If the free chlorine residual and pH was measured to be 2 mg/L(as Cl2) and 7.5, respectively, what is the concentration of residual OCl- ions in the water? Assume that the chlorine gas added to the water is completely converted to HOCl and OCI- . Atomic weight of Cl:35.5