APSC JE Civil Engineering 2021 PYQ with Answers । Part - 4

31 While doing analysis of rates, the number of bricks taken into account per cubic meter of brickwork is

• [A] 2000
• [B] 550
• [C] 500
• [D] 450

Correct Answer is: [C] 500

32 The sub-surface water obtained under pressure is generally known as

• [A] open well
• [B] tube well
• [C] infiltration well
• [D] artesian well

Correct Answer is: [D] artesian well

33 Groundwater is generally free from

• [A] suspended impurities
• [B] dissolved impurities
• [C] Both (A) and (B)
• [D] None of the above

Correct Answer is: [A] suspended impurities

34 The accurate method for predicting population for a sound and rapidly increasing city is

• [A] arithmetical increase method
• [B] geometrical increase method
• [C] incremental increase method
• [D] graphical method

Correct Answer is: [B] geometrical increase method

35 Which of the following processes can effectively remove permanent hardness in water?

• [A] Zeolite process
• [B] Boiling process
• [C] Sedimentation process
• [D] Lime process

Correct Answer is: [A] Zeolite process

36 The self-cleansing velocity normally adopted for sewers is

• [A] 0.1 m/sec
• [B] 0.2 m/sec
• [C] 0.4 m/sec
• [D] 0.85 m/sec

Correct Answer is: [D] 0. 85 m/sec

37 The colour of fresh sewage is

• [A] blue
• [B] green
• [C] black
• [D] grey

Correct Answer is: [D] grey

38 The gas that is mainly responsible for explosion in sewers is

• [A] ammonia
• [B] methane
• [C] oxygen
• [D] carbon monoxide

Correct Answer is: [B] methane

39 Bacteria in sewage are mostly

• [A] anaerobic
• [B] pathogenic
• [C] saprophytic
• [D] parasitic

Correct Answer is: [C] saprophytic

40 The maximum efficiency of BOD removal is achieved in

• [A] oxidation ditch
• [B] trickling filters
• [C] aerated lagoons
• [D] digestion tanks

Correct Answer is: [A] oxidation ditch