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Test: Quality Control of Water Supply - 1 - Civil Engineering (CE) MCQ


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10 Questions MCQ Test GATE Civil Engineering (CE) 2025 Mock Test Series - Test: Quality Control of Water Supply - 1

Test: Quality Control of Water Supply - 1 for Civil Engineering (CE) 2024 is part of GATE Civil Engineering (CE) 2025 Mock Test Series preparation. The Test: Quality Control of Water Supply - 1 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Quality Control of Water Supply - 1 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Quality Control of Water Supply - 1 below.
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Test: Quality Control of Water Supply - 1 - Question 1

The standard turbidity produced by one mg of silicon dioxide (silica) in one litre of distilled water, is called

Test: Quality Control of Water Supply - 1 - Question 2

Pick up the correct statement(s)

Detailed Solution for Test: Quality Control of Water Supply - 1 - Question 2

Let's analyze each statement to determine which one(s) are correct:

1. **Turbidimeters are frequently used to measure turbidities of raw supplies**:
   - This statement is generally true. Turbidimeters are instruments used to measure the turbidity (cloudiness or haziness) of water, which can be done for raw water supplies to assess water quality.

2. **Turbidimeters are frequently installed online in treatment plants to measure turbidities of sedimented filtered waters**:
   - This statement is also true. Turbidimeters are often installed in-line in water treatment plants to continuously monitor the turbidity levels of treated water after filtration.

3. **Nephelometers are frequently used to check and measure the turbidities of final disinfected supplies**:
   - This statement is incorrect. While nephelometers are used to measure suspended particles or colloids in a liquid by detecting light scattered at right angles (nephelometry), they are not specifically used to measure the turbidity of disinfected water supplies. Turbidimeters are more commonly used for measuring turbidity in water.

Given the analysis:

- Statement 1 is correct.
- Statement 2 is correct.
- Statement 3 is incorrect.

Therefore, the correct answer is:

**4. All of the above**

Test: Quality Control of Water Supply - 1 - Question 3

One True Colour Unit (TCU) is the colour produced by

Detailed Solution for Test: Quality Control of Water Supply - 1 - Question 3

The correct option is D 1 mg/L platinum in form of chloroplatinate ion
TCU is the colour unit and represented by colour produced by 1 mg/L of platinum in the form of chloroplatinate ion dissolved in 1 L of distilled water.

Test: Quality Control of Water Supply - 1 - Question 4

The threshold odour number (TON) for a water sample of 40 ml, diluted to standard 200 ml mixture, in which odour is just barely detectable to the sense of smell, is

Detailed Solution for Test: Quality Control of Water Supply - 1 - Question 4

Threshold odour number represents the dilution ratio at which the odour is hardly detectable,
TON  = 200/40 = 5

Test: Quality Control of Water Supply - 1 - Question 5

Water is considered ‘hard’, if its hardness is of the order of

Detailed Solution for Test: Quality Control of Water Supply - 1 - Question 5

Water with hardness upto 75 ppm are considered soft while those with 200 ppm and above are considered hard. In between the waters are considered as moderately hard.

Test: Quality Control of Water Supply - 1 - Question 6

Higher quantities of copper, more than 2.5 mg/l or so, may cause diseases pertaining to

Detailed Solution for Test: Quality Control of Water Supply - 1 - Question 6

High quantities of copper are likely to affect human lungs and other respiratory organs.

Test: Quality Control of Water Supply - 1 - Question 7

The maximum allowable concentration of iron in water is

Detailed Solution for Test: Quality Control of Water Supply - 1 - Question 7

Higher concentration of iron above 0.3 ppm causes discolouration of clothes and incrustation in water mains.

Test: Quality Control of Water Supply - 1 - Question 8

The commonly used indicator for measuring iron concentration in water is

Detailed Solution for Test: Quality Control of Water Supply - 1 - Question 8

Eriochrome black T is used to measure hardness. Phenolphthalein is used to measure alkalinity. Blue litmus is used to measure acidity of water.

Test: Quality Control of Water Supply - 1 - Question 9

The maximum safe permissible limit of chlorides in domestic water supplies is

Test: Quality Control of Water Supply - 1 - Question 10

Breweries and distilleries preferably require

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