1. What causes death of fish in water bodies polluted by sewage? (a) Foul smell
(b) Pathogens
(c) Clogging of gills by silt
(d) Decrease in D.O.
2. Which is the major air pollutant?
(a) He 389. BOD is connected with (a) microbes and organic matter
(b) organic matter
(c) microbes
(d) None of the above
3. Which among the following statements is false?
(a) Oil slick in sea water increases D.O. value.
(b) The main reason for river water pollution is industrial and domestic sewage discharge.
(c) Surface water contains a lot of organic matter mineral nutrients and radioactive materials.
(d) O2
4. The ozone layer is present in
(a) Stratosphere
(b) Thermosphere
(c) CO2
(d) C O
5. Which is related to ‘Green House Effect’?
(a) Farming of green plants
(b) Farming of vegetables in houses
(c) Global warming
(d) Biodegradable pollutant
6. Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water sample to be __________.
(a) rich in dissolved oxygen
(b) poor in dissolved oxygen
(c) highly polluted
(d) not suitable for aquatic life
7. Green chemistry means such reactions which ?
(a) produce colour during reactions
(b) reduce the use and production of hazardous chemicals
(c) are related to the depletion of ozone layer
(d) study the reactions in plants
8. Identify the wrong statement in the following:
(a) Chlorofluorocarbons are responsible for ozone layer depletion.
(b) Greenhouse effect is responsible for global warming.
(c) Acid rain is mostly because of oxides of nitrogen and sulphur.
(d) Ozone layer does not permit infrared radiation from the sun to reach the earth.
9. The statement which is not correct about control of particulate pollution ?
(a) In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed. (b) Gravity settling chamber removes larger particles from the air.
(c) Cyclone collector removes fine particls in the diameter range 5-20 microns.
(d) Wet scrubbers are used to wash away all types of
particulates.
(d) Feldspar
10. Which of the following is an ore of tin ?
(a) Carborundum
(c) Cassiterite
(b) Epsomite
(d) Spodumene
11.Which of the following is chalcopyrite?
(a) CuFeS2 (b) FeS2
(c) KMgCl3.6H2O
12. Minamata disease is due to pollution of
(a) Aresenic into the atmosphere
(b) Organic waste into drinking water
(c) Oil spill in water
(d) Industrial waste mercury into fishing water
13. BOD is connected with ?
(a) microbes and organic matter (b) organic matter
(c) microbes
(d) None of the above
14. Which among the following statements is false?
(a) Oil slick in sea water increases D.O. value.
(b) The main reason for river water pollution is industrial and domestic sewage discharge.
(c) Surface water contains a lot of organic matter mineral nutrients and radioactive materials.
(d) Oil spill in sea water causes heavy damage to fishery.
15. When rain is accompanied by a thunderstorm, the collected rain water will have a pH value ?
(a) Slightly lower than that of rain water without thunderstorm
(b) Slightly higher than that when the thunderstorm is not there
(c) Uninfluenced by occurrence of thunderstorm
(d) Which depends upon the amount of dust in air
16. Thermal pollution affects mainly ?
(a) vegetation
(b) aquatic creature
(d) air
17. Which one of the following statement is not true ?
(a) pH of drinking water should be between 5.5 – 9.5.
(b) Concentration of DO below 6 ppm is good for the growth of fish.
(c) Clean water would have a BOD value of less than 5 ppm.
(d) Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.
18.Which one of the following is an ore of silver ?
(a) Argentite (c) Haematite
(b) Stibnite
(d) Bauxite
19. Cinnabar is an ore of
(a) Hg (b) Cu
(c) Pb
(d) Zn
20. Copper can be extracted from
(a) Kupfernical
(b) Dolomite
(c) Malachite
(d) Galena
21.An example of an oxide ore is
(a) Bauxite
(b) Malachite
(c) Zinc blende
(d) Feldspar
22. Which of the following is an ore of tin ?
(a) Carborundum
(c) Cassiterite
(b) Epsomite
(d) Spodumene
23.Which of the following is chalcopyrite?
(a) CuFeS2
(b) FeS2
(c) KMgCl3.6H2O
(d) Al2O3.2H2O
0 Comments
కామెంట్ను పోస్ట్ చేయండి