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Environmental Engineering | MCQ – 03 | 20 MCQs

Posted on July 6, 2021March 8, 2023 By Civil Vedant

Q.1) The removal of dissolved organic matter occurs in –

A) Slow sand filters

B) Trickling filters

C) Rapid sand filters

D) Dual media filters

Answer

Option (A)

Q.2) A Galvanised Iron (G.I.) pipe has a coating of –

A) Zinc

B) Lead

C) Silver

D) Aluminium

Answer

Option (A)

Q.3) The presence of ozone in water is indicated by –

A) Red colour

B) Light yellow colour

C) Blue colour

D) Black colour

Answer

Option (B)

Q.4) The process used for the removal of dissolved carbon dioxide from the supply water is –

A) Coagulation

B) Agitation

C) Aeration

D) Sedimentation

Answer

Option (C)

Q.5) Disinfection of water is done by –

A) Filteration

B) Passing chlorine

C) Ozone

D) Alum

Answer

Option (B)

Q.6) Alum increases –

A) Hardness of water

B) Carbonates in water

C) Sulphates in water

D) Acidity in water

Answer

Option (D)

Q.7) The slow sand filter should be cleaned if the loss of head becomes more than –

A) 0.75 m

B) 1.2 m

C) 2.2 m

D) 3.5 m

Answer

Option (B)

Q.8) The period of cleaning for rapid sand filter is –

A) 2 – 3 months

B) 24 – 48 months

C) 24 – 48 hours

D) 24 – 48 weeks

Answer

Option (C)

Q.9) Coagulants are used when turbidity of water is more than –

A) 50 ppm

B) 60 ppm

C) 70 ppm

D) 80 ppm

Answer

Option (A)

Q.10) The path of a particle in sedimentation tank is –

A) Parabolic

B) Straight

C) Elliptical

D) Circular

Answer

Option (A)

Q.11) A chemical used to inhibit the growth of algae is –

A) Chlorine

B) Iodine

C) Lead

D) Algicides

Answer

Option (D)

Q.12) Disease caused by protozoal infections is –

A) Poliomyelitis

B) Amoebic dysentery

C) Bacillary dysentery

D) Malaria

Answer

Option (B)

Q.13) Lead poisoning occurs when the lead content in water exceeds –

A) 0.05 ppm

B) 0.1 ppm

C) 0.15 ppm

D) 0.5 ppm

Answer

Option (D)

Q.14) The permissible limit of nitrate content in potable water is –

A) 25 ppm

B) 45 ppm

C) 100 ppm

D) 150 ppm

Answer

Option (B)

Q.15) The range of Bayli’s turbidimeter is –

A) 0 – 2 ppm

B) 0 – 50 ppm

C) 0 – 500 ppm

D) 0 – 1000 ppm

Answer

Option (A)

Q.16) The compensation for losses, theft and wastage of water, an allowance provided is –

A) 5%

B) 10%

C) 15%

D) 25%

Answer

Option (C)

Q.17) The sub-surface water obtained under pressure is generally known as –

A) Open well

B) Tube well

C) Infiltration well

D) Artesian well

Answer

Option (D)

Q.18) The specific retention is least in –

A) Coarse gravel

B) Sand

C) Clay

D) Silt

Answer

Option (A)

Q.19) The most widely used tube well in India is –

A) Strainer well

B) Cavity well

C) Slotted well

D) Perforated well

Answer

Option (A)

Q.20) The coefficient of uniformity for slow sand filters is –

A) 1.35

B) 1.55

C) 1.75

D) 2.05

Answer

Option (C)

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