Which one of the following statements is correct ?
(A) Snow albedo falls at all wave length with the increase of grain size
(B) The effect of grain size on reflection is maximum in the near-IR region
(C) The effect of grain size on reflection is low in the visible region of the spectrum
(D) All of these
Which one of the following statement is correct ?
(A) Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation
(B) The rate of transfer of radiant energy is called flux and is expressed in watts
(C) The radiant energy which falls upon a surface is termed as irradiance
(D) All of these
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of______________?
(A) 15 days
(B) 30 days
(C) 60 days
(D) 90 days
No treatment of the sewage is given if dilution factor is_____________?
(A) Less than 150
(B) Between 150 to 200
(C) Between 200 to 300
(D) More than 500
The pressure exerted by_____________?
(A) The sewage when running full from inside, is called internal pressure
(B) The internal pressure if any, causes tensile stress in the pipe material
(C) Pressure sewers are designed to be safe in tension
(D) All the above
For a continuous flow type of sedimentation tanks__________________?
(A) Width of the tank is normally kept about 6 m
(B) Length of the tank is normally kept 4 to 5 times the width
(C) Maximum horizontal flow velocity is limited to 0.3 m/minute
(D) All the above
For drainage pipes in buildings the test applied before putting them to use, is__________________?
(A) Water test
(B) Smoke test
(C) Straightness test
(D) All the above
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided________________?
(A) 15 cm c/c
(B) 22.5 cm c/c
(C) 30 cm c/c
(D) 50 cm c/c
The asbestos cement sewers are_________________?
(A) Light in weight
(B) Not structurally strong to bear large compressive stress
(C) Susceptible to corrosion by sulphuric acid
(D) All the above
¾th or ¼th extra space is left in sewer pipes at maximum discharge for_________________?
(A) Low estimates of the average and maximum flows
(B) Large scale infiltration of storm water
(C) Unexpected increase in population
(D) All the above