Home - Environmental Engineering - Disinfection Methods

Disinfection Methods Online Exam Quiz

Important questions about Disinfection Methods. Disinfection Methods MCQ questions with answers. Disinfection Methods exam questions and answers for students and interviews.

Which type of chlorine is represented by the green line as shown in the following figure?

Options

A : a. Free residual chlorine

B : b. Ammonia chlorine

C : c. Combined residual chlorine

D : d. Residual chloramine

Which type of chlorine is represented by the red line as shown in the following figure?

Options

A : a. Free residual chlorine

B : b. Ammonia chlorine

C : c. Combined residual chlorine

D : d. Residual chloramine

Which water treatment process is done after filtration of water?

Options

A : a. Primary sedimentation

B : b. Disinfection

C : c. Secondary sedimentation

D : d. Flocculation

Which of the following is wrong regarding disinfection?

Options

A : a. It should be readily available at reasonable cost

B : b. Its method of application should be simple

C : c. It should render the water toxic for its intended use

D : d. It should act as safeguard against re-contamination

Boiling of water is a _____ method of disinfection.

Options

A : a. Physical

B : b. Chemical

C : c. Mechanical

D : d. Electrical

Sunlight is a ________ method of disinfection.

Options

A : a. Physical

B : b. Chemical

C : c. Mechanical

D : d. Electrical

Which of the following is a chemical method of disinfection?

Options

A : a. Disinfection by heat

B : b. Disinfection by light

C : c. Metal ions

D : d. Metal ions, Alkalis and acids

The pathogenic bacteria do not last long at a pH ______

Options

A : a. >11

B : b. <11

C : c. <8

D : d. >8

Which minor method of disinfection is effective in complete sterilization of water?

Options

A : a. Boiling method

B : b. Excess lime treatment

C : c. Silver treatment

D : d. Ultraviolet ray treatment

What is the dose of lime required in the excess lime treatment?

Options

A : a. 10-20ppm

B : b. 0-10ppm

C : c. 5-10ppm

D : d. 5-20ppm

At what pH, the E-Coli bacteria will die in the water?

Options

A : a. 6

B : b. 7

C : c. 9

D : d. >9.5

The depth of water while using ultra violet ray treatment for disinfection should be ____

Options

A : a. 35cm

B : b. 46cm

C : c. 28cm

D : d. 10cm

Which method of disinfection is mainly used in rural areas?

Options

A : a. Boiling method

B : b. Excess lime treatment

C : c. Potassium permanganate treatment

D : d. Silver treatment

The dose of KMnO? required for disinfection of water is _______ ppm.

Options

A : a. 1-2

B : b. 2-3

C : c. 3-4

D : d. 4-7

Addition of KMnO? to water imparts _____ color.

Options

A : a. Blue

B : b. Red

C : c. Pink

D : d. White

Which of the following is termed as free available chlorine?

Options

A : a. Hypochlorous acid

B : b. Hypochlorite ions

C : c. Molecular chlorine

D : d. Hypochlorous acid, Hypochlorite ions, Molecular chlorine

At what pH, chlorine exists as molecular chlorine?

Options

A : a. 3

B : b. 5

C : c. <5

D : d. <10

When the pH is between 5 and 10, the chlorine in the water acts as ______

Options

A : a. Hypochlorous acid

B : b. Hypochlorite ions

C : c. Molecular chlorine

D : d. Hypochlorous acid hypochlorite ions

At what pH, chlorine in water acts as only hypochlorite ions?

Options

A : a. <5

B : b. >5

C : c. >10

D : d. <3

The hypochlorous acid is ______ times effective as hypochorite ions.

Options

A : a. 10

B : b. 30

C : c. 50

D : d. 80

Environmental Engineering more Online Exam Quiz

Copyright © 2021
Exam-GK-MCQ-Questions.Com | Contact Us | Privacy Policy | Terms of Use | Sitemap | 0.019787788391113