Environmental Engineering Mcqs

This set of Civil Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Environmental Engineering ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Civil Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Environmental Engineering comprehensively.

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Residual chlorine in water is determined by________________?

Starch iodide method

Orthotolidine method

Both (A) and (B)

None of the above

If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?

Total alkalinity

Total hardness

Total hardness – total alkalinity

Non carbonate hardness

The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?

1 mg/litre

10 mg/litre

100 mg/litre

1000 mg/litre

Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?

10 to 25




The settling velocity of a particle in a sedimentation tank increases if______________?

Particle size is decreased

The surface area of tank is increased

The depth of tank is decreased

None of the above

The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?

Less and more

Less and less

More and less

More and more

Alum as a coagulant is found to be most effective when pH range of water is______________?

2 to 4

4 to 6

6 to 8

8 to 10

The alum, when added as a coagulant in water_______________?

Does not require alkalinity in water for flocculation

Does not affect pH value of water

Increases pH value of water

Decreases pH value of water

In water treatment, rapid gravity filters are adopted to remove_______________?

Dissolved organic substances

Dissolved solids and dissolved gases

Floating solids and dissolved inorganic solids

Bacteria and colloidal solids

The effective size of sand particles used in slow sand filters is_______________?

0.25 to 0.35 mm

0.35 to 0.60 mm

0.60 to 1.00 mm

1.00 to 1.80 mm

Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on the coding system given below?

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

The percentage of filtered water, which is used for backwashing in rapid sand filters, is about______________?

0.2 to 0.4

0.4 to 1.0

2 to 4

5 to 7

The rate of Alteration of pressure filters is_________________?

Less than that of slow sand filters

In between the filtration rate of slow sand filters and rapid sand filters

Greater than that of rapid sand filters

Equal to that of slow sand filters

Chlorine demand of water is equal to________________?

Applied chlorine

Residual chlorine

Sum of applied and residual chlorine

Difference of applied and residual chlorine

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