A. Mercury
B. Arsenic
C. Aluminium
D. Lead
0
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________________?
0
In water treatment plant, zeolite process is used to remove the _____________ of water?
A. Of clotting of blood
B. Of jamming of respiratory tract
C. It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it
incapable of absorbing oxygen
D. It forms CO2 by combining with oxygen present in the blood
0
Disinfection of water is done to remove ______________________?
A. Acidity
B. Alkalinity
C. Hardness
D. Iron & zinc
0
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?
A. Color
B. Bad taste
C. Foul odour
D. Bacteria
0
The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?
A. 105
B. 135
C. 160
D. 185
0
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. 20
B. 230
C. 750
D. 1500
0
The upper layer of atmosphere is called the ____________________?
A. 102
B. 105
C. 109
D. 1015
0
The term Biological Oxygen Demand (BOD) is used in relation to ______________________?
A. Stratosphere
B. Troposphere
C. Ionosphere
D. None of these