A. Refrigerators
B. Xerox machines
C. Dermatological photo-therapy equipments
D. High voltage electrical equipments
Related Mcqs:
- 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 - Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of________________?
A. CO2
B. SO2
C. Hydrocarbons
D. CFC (chloro fluoro carbon) - The main industrial source of emission of hydrogen sulphide air pollutant is________________?
A. Petroleum refineries
B. Coal based thermal power plants
C. Pulp and paper plant
D. Metallurgical roasting & smelting plant - Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?
A. Grinding
B. Machining
C. Cutting
D. Polishing - Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?
A. CO
B. SO2
C. NOx
D. CFC (chloro fluoro carbons) - The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?
A. Ionosphere
B. Troposphere
C. Stratosphere
D. None of these - Ozone is__________________?
A. A primary pollutant
B. A secondary pollutant
C. Impervious to ultra-violet rays
D. Both B. and C. - Presence of high concentration of ozone and smog in atmospheric air causes the __________________?
A. Embrittlement & decrease of folding resistance of paper
B. Cracking of rubber products
C. Fading of dye on textiles
D. Damage of electrical insulator on high tension power line - The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)?
A. 20
B. 230
C. 750
D. 1500 - TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?
A. 0.1
B. 25
C. 100
D. 1000
