The upper layer of atmosphere is called the ____________________?
(A) Stratosphere
(B) Troposphere
(C) Ionosphere
(D) None of these
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone?
(A) 102
(B) 105
(C) 109
(D) 1015
The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?
(A) 20
(B) 230
(C) 750
(D) 1500
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?
(A) 105
(B) 135
(C) 160
(D) 185
Disinfection of water is done to remove ______________________?
(A) Color
(B) Bad taste
(C) Foul odour
(D) Bacteria
In water treatment plant, zeolite process is used to remove the _____________ of water?
(A) Acidity
(B) Alkalinity
(C) Hardness
(D) Iron & zinc
______________ is the process of killing organism in water ?
(A) Coagulation
(B) Sterilisation
(C) Disinfection
(D) Sedimentation
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?
(A) 5
(B) 50
(C) 500
(D) 5000