MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called__________________? |
| A. | Grit |
| B. | Dust |
| C. | Powder |
| D. | Smoke |
| Answer» B. Dust | |
| 2. |
Ozone is__________________? |
| A. | A primary pollutant |
| B. | A secondary pollutant |
| C. | Impervious to ultra-violet rays |
| D. | Both B. and C. |
| Answer» E. | |
| 3. |
Out of the following, TLV of _______________ is maximum (about 500 ppm)? |
| A. | Carbon dioxide |
| B. | Toluene |
| C. | Carbon disulphide |
| D. | Acetaldehyde |
| Answer» B. Toluene | |
| 4. |
Operating principle of cyclone separator is based on the action of _______________ dust particles? |
| A. | Diffusion of |
| B. | Centrifugal force on |
| C. | Gravitational force on |
| D. | Electrostatic force on |
| Answer» C. Gravitational force on | |
| 5. |
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________________? |
| 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 |
| Answer» D. It forms CO2 by combining with oxygen present in the blood | |
| 6. |
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________? |
| A. | Chemical coagulation |
| B. | Floatation & skimming |
| C. | Centrifugation |
| D. | Ultra filtration |
| Answer» B. Floatation & skimming | |
| 7. |
Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the_______________? |
| A. | Forestation |
| B. | Rain |
| C. | Green house effect |
| D. | Vegetation |
| Answer» D. Vegetation | |
| 8. |
Noise pollution level in a chemical plant is expressed in __________________? |
| A. | Roentgen |
| B. | Decibel |
| C. | Hertz |
| D. | None of these |
| Answer» C. Hertz | |
| 9. |
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________? |
| A. | With greater number of blades |
| B. | Of increased diameter |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 10. |
Noise level inside a jet airliner in normal flight is about ______________ decibels? |
| A. | 80 |
| B. | 100 |
| C. | 125 |
| D. | 150 |
| Answer» C. 125 | |
| 11. |
Noise level during normal conversation among men is about ______________ decibels? |
| A. | 10 |
| B. | 45 |
| C. | 90 |
| D. | 115 |
| Answer» C. 90 | |
| 12. |
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about _____________ decibels? |
| A. | 120 |
| B. | 140 |
| C. | 170 |
| D. | 200 |
| Answer» D. 200 | |
| 13. |
Noise level in a quiet private business office is about _____________ decibels? |
| A. | 25 |
| B. | 50 |
| C. | 70 |
| D. | 85 |
| Answer» C. 70 | |
| 14. |
Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about ______________ decibels? |
| A. | 75 |
| B. | 95 |
| C. | 120 |
| D. | 140 |
| Answer» C. 120 | |
| 15. |
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 |
| Answer» C. 160 | |
| 16. |
Noise emitted by a ventilation fan at a distance of 3 metres is about _____________ decibels? |
| A. | 85 |
| B. | 105 |
| C. | 125 |
| D. | 145 |
| Answer» C. 125 | |
| 17. |
Nitrogen oxides (NOx) is not produced in the ______________ industry? |
| A. | Nitric acid making |
| B. | Nitrogenous fertiliser |
| C. | Detergent |
| D. | Any of these |
| Answer» D. Any of these | |
| 18. |
Most of the atmospheric air pollutants are present in large quantity in__________________? |
| A. | Stratosphere |
| B. | Thermosphere |
| C. | Troposphere |
| D. | Mesosphere |
| Answer» D. Mesosphere | |
| 19. |
Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________________? |
| A. | Gravity settling chamber |
| B. | Cyclone separator |
| C. | Electrostatic precipitator |
| D. | Bag filter |
| Answer» D. Bag filter | |
| 20. |
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes________________? |
| A. | Fading of dyes on textiles |
| B. | Corrosion, tarnishing & soiling of metals |
| C. | Reduced strength of textiles |
| D. | All A., B. and C. |
| Answer» E. | |
| 21. |
Methyl isocyanate (MIC) gas (TLV |
| A. | Moderately |
| B. | Highly |
| C. | Extremely |
| D. | Very extremely |
| Answer» E. | |
| 22. |
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is _____________ decibels? |
| A. | 35 |
| B. | 75 |
| C. | 95 |
| D. | 105 |
| Answer» C. 95 | |
| 23. |
Maximum permissible turbidity in potable water is _____________ ppm? |
| A. | 1 |
| B. | 10 |
| C. | 250 |
| D. | 1000 |
| Answer» C. 250 | |
| 24. |
Maximum permissible residual chlorine in treated water should be ____________ mg/litre? |
| A. | 0.001 to 0.01 |
| B. | 0.2 to 0.3 |
| C. | 2 to 3 |
| D. | 5 to 10 |
| Answer» C. 2 to 3 | |
| 25. |
Maximum permissible limit of mercury in human blood is ______________ micrograms/100 c.c? |
| A. | 1 |
| B. | 7 |
| C. | 19 |
| D. | 82 |
| Answer» C. 19 | |
| 26. |
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre? |
| A. | 22 |
| B. | 42 |
| C. | 332 |
| D. | 1050 |
| Answer» C. 332 | |
| 27. |
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about ______________ decibels? |
| A. | 20 |
| B. | 60 |
| C. | 90 |
| D. | 120 |
| Answer» D. 120 | |
| 28. |
Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)? |
| A. | 50 |
| B. | 1000 |
| C. | 2000 |
| D. | 5000 |
| Answer» E. | |
| 29. |
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels? |
| A. | 3 |
| B. | 30 |
| C. | 7 |
| D. | 70 |
| Answer» B. 30 | |
| 30. |
Main pollutants released from petroleum refineries is__________________? |
| A. | CO, SO2 & H2S |
| B. | CO2, NO & SO3 |
| C. | CO2, H2S & NO2 |
| D. | SO3, NO2 & CO2 |
| Answer» B. CO2, NO & SO3 | |
| 31. |
Main pollutants released from iron & steel industry is__________________? |
| A. | CO, CO2 & SO2 |
| B. | H2S, NO & SO3 |
| C. | CO2, H2S & NO2 |
| D. | SO3, NO2 & CO2 |
| Answer» B. H2S, NO & SO3 | |
| 32. |
Main pollutant present in automobile exhaust is_________________? |
| A. | CO |
| B. | CO2 |
| C. | NO |
| D. | Hydrocarbons |
| Answer» B. CO2 | |
| 33. |
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) |
| Answer» E. | |
| 34. |
Limestone powder is injected during pulverised coal burning in boilers to ______________ the flue gases? |
| A. | Reduce SO2 content in |
| B. | Catalytically convert SO2 to SO3 in |
| C. | Increase the dew point of |
| D. | None of these |
| Answer» B. Catalytically convert SO2 to SO3 in | |
| 35. |
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________? |
| A. | Paralysis of muscles & loss of appetite |
| B. | Nervous depression |
| C. | Gastritis and diarrhea |
| D. | All A., B. and C. |
| Answer» E. | |
| 36. |
Lagoons used for purification of polluted water_______________? |
| A. | Are large shallow artificial lakes also known as clarification lakes, maturation ponds or oxidation ponds |
| B. | Use micro-organisms/bacteria in presence of dissolved oxygen |
| C. | Gives an excellent final effluent (with 3 to 4 lagoons arranged in series) having suspended solid < 1 mg/litre and BOD = 3.8 mg/litre |
| D. | All A., B. & C. |
| Answer» E. | |
| 37. |
Lagooning process is mainly a means of the__________________? |
| A. | Sludge disposal |
| B. | Reduction of excessive flow in sewers |
| C. | Biological treatment of wastes |
| D. | None of these |
| Answer» B. Reduction of excessive flow in sewers | |
| 38. |
______________ is the process of killing organism in water ? |
| A. | Coagulation |
| B. | Sterilisation |
| C. | Disinfection |
| D. | Sedimentation |
| Answer» D. Sedimentation | |
| 39. |
____________ is removed from water by lime-soda process? |
| A. | Foul smell and taste |
| B. | Iron and manganese |
| C. | Temporary hardness |
| D. | Permanent hardness |
| Answer» D. Permanent hardness | |
| 40. |
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________? |
| A. | Food industry |
| B. | Municipal sewage treatment |
| C. | Petroleum refinery |
| D. | Iron & steel plant |
| Answer» B. Municipal sewage treatment | |
| 41. |
Iron & manganese present in the polluted water is removed by __________________? |
| A. | Simple filtration |
| B. | Oxidation followed by settling & filtration |
| C. | Chemical coagulation |
| D. | Chlorination only |
| Answer» C. Chemical coagulation | |
| 42. |
Iron & manganese present as pollutant in water cannot be removed by__________________? |
| A. | Ion exchange process |
| B. | Oxidation followed by settling & filtration |
| C. | Lime soda process or manganese zeolite process |
| D. | Chlorination |
| Answer» E. | |
| 43. |
Ionisation potential employed in the industrial electrostatic precipitator is of the order of_______________? |
| A. | 30 to 70 kV DC |
| B. | 30 to 70 kV AC |
| C. | 230 V AC |
| D. | 230 V DC |
| Answer» B. 30 to 70 kV AC | |
| 44. |
Insufficient washing of sand grains in a rapid sand filter causes__________________? |
| A. | Air binding |
| B. | Shrinkage of filtering media |
| C. | Mud balls |
| D. | Expansion of filtering media |
| Answer» D. Expansion of filtering media | |
| 45. |
Inorganic impurities causing water pollution is ____________________? |
| A. | Fats |
| B. | Carbohydrates |
| C. | Salts of metals |
| D. | Protein |
| Answer» D. Protein | |
| 46. |
Inhalation of silica dust causes a disease called__________________? |
| A. | Bronchitis |
| B. | Silicosis |
| C. | Pneumoconiosis |
| D. | None of these |
| Answer» C. Pneumoconiosis | |
| 47. |
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundries causes___________________? |
| A. | Asphyxiation (suffocation) |
| B. | Shortness of breath |
| C. | Tuberculosis |
| D. | All A., B. and C. |
| Answer» E. | |
| 48. |
Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes________________? |
| A. | Blood poisoning |
| B. | Anaemia |
| C. | Nervous system disorder |
| D. | All A., B. and C. |
| Answer» E. | |
| 49. |
Inhalation of silica dust by human being causes ___________________? |
| A. | Asphyxiation |
| B. | Shortness of breath |
| C. | Tuberculosis |
| D. | Both B. & C. |
| Answer» E. | |
| 50. |
Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________________? |
| A. | Blood poisoning |
| B. | Anaemia |
| C. | Nervous system disorder |
| D. | All A., B. & C. |
| Answer» E. | |