Q.1) In case of laying gullies, siphons, intercepting traps, the cost includes –
A) Setting and Laying
B) Bed concreting
C) Connection to drains
D) All of the above
Option (D)
Q.2) Which of the following represents the value of hourly variation factor?
A) 1.2
B) 1.5
C) 1.7
D) 2.5
Option (B)
Q.3) For construction use at a village site, the local pond water must be –
A) Sieved
B) Boiled and filtered
C) Mixed with jaggery
D) Treated with chlorine
Option (D)
Q.4) The % of chlorine in fresh bleaching powder is about –
A) 10 – 20
B) 20 – 25
C) 30 – 35
D) 40 – 50
Option (C)
Q.5) Nitrates more than 45mg/l in water lead to disease called –
A) Gastroenteritis
B) Mottled teeth
C) Polio
D) Blue Baby disease
Option (D)
Q.6) Hardness of water is caused by the presence of the following in water :
A) Chlorides and Sulphate
B) Calcium and Magnesium
C) Nitrites and Nitrates
D) Sodium and Potassium
Option (B)
Q.7) The valve which protects the water meter from the damages of water hammer –
A) Pressure relief valve
B) Stop cock
C) Reflux valve
D) Water hammer valve
Option (A)
Q.8) The measure of absorption or scattering of light by the suspended materials present in the water is known as –
A) Alkalinity
B) Color
C) Hardness
D) Turbidity
Option (D)
Q.9) Which of the following is the result of disinfection of water?
A) Complete grits
B) Killing of bacteria
C) Reducing turbidity upto zero
D) Improve pH values
Option (B)
Q.10) The minimum diameter of an opening of a manhole should be –
A) 25 cm
B) 50 cm
C) 75 cm
D) 105 cm
Option (A)
Q.11) The pH value of fresh-sewage is usually –
A) < 7
B) > 7
C) = 7
D) Equal to zero
Option (B)
Q.12) BOD test is conducted at a temperature of –
A) Ambient temperature
B) 150 C
C) 200 C
D) 270 C
Option (B)
Q.13) Which type of system will collect the rainwater?
A) Primary
B) Secondary
C) Tertiary
D) Primary and Tertiary
Option (A)
Q.14) Primary treatment of sewage consist of :
A) Removal of floating materials
B) Removal of sand and grit
C) Removal of organic materials
D) All of the above
Option (D)
Option (D)
Q.16) Anaerobic treatment is best suited for –
A) High efficiency
B) Toxic wastes
C) Dilute inorganic wastes
D) Strong organic wastes
Option (D)
Q.17) The minimum width of septic tank is taken –
A) 70 cm
B) 75 cm
C) 80 cm
D) 90 cm
Option (B)
Q.18) Before discharging the foul sewage into rivers, it is generally treated by –
A) Screening
B) Sedimentation
C) Oxidation
D) All of the above
Option (A)
Q.19) The most efficient method to conserve energy in the form of oil and gases is –
A) Combustion
B) Fluidized-bed incineration
C) Incineration with heat recovery
D) Pyrolysis
Option (C)
Q.20) Which of the following emission is the primary reason for the depletion of the ozone layer?
A) CO2
B) CFCs
C) CO
D) NO2
Option (B)
