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Environmental Engineering || MCQ – 04 || 20 MCQs

Posted on July 23, 2021March 8, 2023 By Civil Vedant

Q.1) The water obtained from…….is generally known as sub-surface water.

A) Rains

B) Rivers

C) Reservoirs

D) Artesian wells

Answer

Option (D)

Q.2) The portion of soil through which lateral movement of water takes place is called –

A) Water table

B) An aquiclude

C) Zone of saturation

D) An aquifuge

Answer

Option (C)

Q.3) The presence of hydrogen sulphide in water causes –

A) Softening

B) Alkalinity

C) Acidity

D) Bad taste

Answer

Option (C)

Q.4) The maximum permissible temperature for domestic supply is –

A) 5 to 10 deg C

B) 10 to 15 deg C

C) 15 to 20 deg C

D) 20 to 25 deg C

Answer

Option (B)

Q.5) Low turbidity of water can be determined by –

A) Turbidity tube

B) Jackson’s turbidimeter

C) Bayli’s turbidimeter

D) Hellipe turbidimeter

Answer

Option (C)

Q.6) The maximum permissible quantity of iron and manganese in water for domestic purposes should be –

A) 0.1 ppm

B) 0.3 ppm

C) 0.6 ppm

D) 0.8 ppm

Answer

Option (B)

Q.7) Sphere shaped bacterias are called :

A) Spirilla

B) Bacilli

C) Cocci

D) Trichobacteria

Answer

Option (C)

Q.8) The efficiency of sedimentation tank for a given discharge can be increased by –

A) Increasing the depth of tank

B) Decreasing the depth of tank

C) Increasing the surface area of tank

D) Decreasing the surface area of tank

Answer

Option (C)

Q.9) The effective size of sand particles for slow sand filters varies from –

A) 0.30 to 0.35 mm

B) 0.35 to 0.50 mm

C) 0.50 to 0.65 mm

D) 0.65 to 0.75 mm

Answer

Option (A)

Q.10) The ideal method of disinfection of swimming pool water is by –

A) Chlorination

B) Lime treatment

C) Ozonisation

D) Ultra-violet rays

Answer

Option (C)

Q.11) The amount of chlorine used for plain chlorination of water is about –

A) 0.2 ppm

B) 0.3 ppm

C) 0.4 ppm

D) 0.5 ppm

Answer

Option (D)

Q.12) By lime soda process, hardness can be reduced to less than –

A) 50 ppm

B) 75 ppm

C) 100 ppm

D) 150 ppm

Answer

Option (A)

Q.13) The plain ends of cast iron pipes are joined by –

A) Spigot and Socket joint

B) Flanged joint

C) Victuallic joint

D) Dresser coupling joint

Answer

Option (D)

Q.14) In order to control the flow of water through pipes, a………is provided.

A) Scour valve

B) Air valve

C) Gate valve

D) Safety valve

Answer

Option (C)

Q.15) The water from kitchens, bathrooms, wash basins is called –

A) Sewage

B) Sullage

C) Raw sewage

D) None of the above

Answer

Option (B)

Q.16) The self-cleaning velocity, recommended for Indian conditions, in order to prevent settling down of sewage at the bottom or on the sides of a large sewer is –

A) 0.25 m/s

B) 0.50 m/s

C) 0.75 m/s

D) 1.50 m/s

Answer

Option (C)

Q.17) The water carriage sewage system removes –

A) Domestic sewage

B) Industrial sewage

C) Storm sewage

D) All of the above

Answer

Option (D)

Q.18) The internal diameter of the sewer should not be less than –

A) 15 cm

B) 25 cm

C) 50 cm

D) 75 cm

Answer

Option (A)

Q.19) For large sewers, the maximum distance between manholes should be –

A) 75 m

B) 150 m

C) 200 m

D) 300 m

Answer

Option (D)

Q.20) The bio-chemical treatment of sewage effluent is a process of –

A) Oxidation

B) Deoxidation

C) Self purification

D) Sedimentation

Answer

Option (A)

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Environment Engg. Tags:civil engineering important questions, civil engineering objective questions, civil engineering questions for interview, environmental engineering mcqs

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