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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) 2025 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) 2025 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

Detailed Solution for 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 measured in specific units.

  • The turbidity unit commonly used for this measurement is the Jackson turbidity unit (JTU).

  • Another unit you might encounter is the Formazin turbidity unit (FTU).

  • Additionally, Nephelometry turbidity unit (NTU) is often referenced in scientific contexts.

  • Each of these units serves to express the clarity of water based on the amount of suspended particles.

For standardisation, the Jackson turbidity unit is specifically defined for measuring the turbidity resulting from silica in distilled water.

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
  • Turbidimeters are devices used to measure the cloudiness or haziness of a fluid, typically water. They are often employed in:

    • Raw water supplies to assess the initial turbidity levels before treatment processes. This justifies statement A.

    • Treatment plants, where they are installed on-line to monitor the turbidity of sedimented and filtered waters. This supports statement B  
  • Nephelometers are specific types of turbidimeters that measure scattered light to determine turbidity but are not typically mentioned for final disinfected supplies in the context given.
  • Therefore, the correct answer is D: Both A and B as both statements accurately describe common uses of turbidimeters in water treatment contexts.

 

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

Detailed Solution for Test: Quality Control of Water Supply - 1 - Question 9

The maximum permissible limit of chlorides in domestic water supplies, as recommended by the World Health Organization (WHO) and other regulatory bodies, is generally 250 mg/l. Chlorides are commonly found in water from natural sources or due to pollution, and while they are not directly harmful in small amounts, high concentrations can lead to a salty taste in the water and may have detrimental effects on water quality and plumbing systems.

At concentrations above 250 mg/l, the water may not be palatable, and it could potentially lead to issues with water distribution systems, such as corrosion. However, this level is considered the safe upper limit for domestic water supplies.

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

Breweries and distilleries preferably require

Detailed Solution for Test: Quality Control of Water Supply - 1 - Question 10

Brewery and distillery operations often benefit from specific water characteristics that influence the quality of their products. Here are the key points regarding the type of water they prefer:

  • Hard water contains higher levels of minerals, such as calcium and magnesium, which can enhance the flavour and stability of beverages.
  • Soft water, on the other hand, has fewer minerals and may not provide the same depth of flavour in brewing or distilling.
  • Potable water is essential for safety but does not necessarily contribute to the desired taste profile.
  • Overall, hard water is generally preferred in the production processes of breweries and distilleries.
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