Question: On standard silica scale, the turbidity in drinking water should be limited to_______________?

• 1. 10 ppm
• 2. 20 ppm
• 3. 30 ppm
• 4. 50 ppm

Question: Which of the following values of pH represents a stronger acid?

• 1. 2
• 2. 5
• 3. 7
• 4. 10

Question: Standard EDTA (ethylene diamine tetra acetic aciD. solution is used to determine the_______________?

• 1. hardness in water
• 2. turbidity in water
• 3. dissolved oxygen in water
• 4. residual chlorine in water

Question: Ground water is usually free from________________?

• 1. suspended impurities
• 2. dissolved impurities
• 3. both suspended and dissolved impuri¬ties
• 4. none of the above

Question: The maximum discharge of a tube-well is about_________________?

• 1. 5 litres/sec
• 2. 50 litres/sec
• 3. 500 litres/sec
• 4. 1000 litres/see

Question: The phenolic compounds in public water supply should not be more than_______________?

• 1. 0.1 ppm
• 2. 0.01 ppm
• 3. 0.001 ppm
• 4. 0.0001 ppm

Question: Which of the following is not a water borne disease ?

• 1. dysentery
• 2. cholera
• 3. typhoid
• 4. maleria

Question: Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)________________?

• 1. N = y + R
• 2. y = N + R
• 3. R = N + y
• 4. R > (N + y)

Question: The suitable method of forecasting popu¬lation for a young and rapidly increasing city is_________________?

• 1. arithmetical increase method
• 2. geometrical increase method
• 3. incremental increase method
• 4. graphical method

Question: As compared to geometrical increase method of forecasting population, arithmetical increase method gives________________?

• 1. lesser value
• 2. higher value
• 3. same value
• 4. accurate value