APSC JE Civil Engineering 2021 PYQ with Answers । Part - 3

21 Sludge volume index is defined as the ratio of

• [A] Percentage of sludge by volume to percentage of suspended solids by weight
• [B] Percentage of sludge by volume to percentage of suspended solids by weight
• [C] Percentage of suspended solids by weight to the percentage of sludge by volume
• [D] Percentage of total solids by weight to the percentage of sludge by volume

Correct Answer is: [B] Percentage of sludge by volume to percentage of suspended solids by weight

22 Standard EDTA (ethylene diamine tetra-acetic acid) solution is used to determine the

• [A] Hardness in water
• [B] Dissolved oxygen in water
• [C] Turbidity in water
• [D] Residual chlorine

Correct Answer is: [A] Hardness in water

23 The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is

• [A] 1 ppm
• [B] 4 ppm
• [C] 10 ppm
• [D] 40 ppm

Correct Answer is: [B] 4 ppm

24 The maximum permissible limit for fluoride in drinking water is

• [A] 0.1 mg/litre
• [B] 1.5 mg/litre
• [C] 5 mg/litre
• [D] 10 mg/litre

Correct Answer is: [B] 1.5 mg/litre

25 Average rate of water consumption per head per day as per Indian Standard is

• [A] 100 litres
• [B] 135 litres
• [C] 165 litres
• [D] 200 litres

Correct Answer is: [B] 135 litres

26 The water surface of a still pond represents a

• [A] Level surface
• [B] Horizontal surface
• [C] Spheroidal surface
• [D] Curved surface

Correct Answer is: [A] Level surface

27 Height of instrument method of levelling as compared to rise and fall method of levelling is

• [A] More accurate
• [B] Less accurate
• [C] Quicker and less tedious
• [D] None of the above

Correct Answer is: [C] Quicker and less tedious

28 In the absence of detailed design, the percentage of steel in concrete columns is usually taken as

• [A] 10% to 15%
• [B] 5% to 10%
• [C] 1% to 5%
• [D] 15% to 20%

Correct Answer is: [C] 1% to 5%

29 The useful part of a liveable area of a building is also known as

• [A] Built-up area
• [B] Carpet area
• [C] Plinth area
• [D] Service area

Correct Answer is: [B] Carpet area

30 While analyzing the rates, water charges are added on those items, which require water in construction and these charges are added at the rate of

• [A] 1%
• [B] 3%
• [C] 5%
• [D] 10%

Correct Answer is: [A] 1%