100 best MCQs on environmental health 4 health science-Hn20

MCQs on environmental health

1. The following is not surface water:

a. Pond         

b. Spring

c. River, Lake

d. Stream

2. Which of the following disease is due to snail?

a. Fish tapeworm

b. Thread worm

c. Schistosomiasis

d. Hydatid disease

3. The vital layer of the slow sand filter is also called:

a. Sandbed layer   b. Superficial layer

c. Chemical layer   d. Schmutzdecke

4. Chlorination of water helps in:

a. Kills pathogenic bacteria, and controls the growth of algae.

b. Assists in coagulation

c. Damage some taste and odor-producing elements

d. Above all

5. The meaning of breakpoint chlorination is:

a. After partial saturation of chlorine water

b. Start of the chlorination process

c. When free residual chlorine starts appearing

d. End of the chlorination process

6. Cheapest and effectual method of disinfecting wells is by:

a. Iodine          b. Bleaching powder

c. Chlorine gas solution

d. Potassium permanganate

7. Water pollution is indicated by:

a. Fluoride       b. Nitrate

c. Ammonia    d. Above all

8. The following are  bacteriological indicators of water contamination except:

a. Faecal streptococci   b. E. coli

c. Cl. perfringers            d. S. typhi

8. Major air pollutant is:

a. Nitrogen dioxide

b. Carbon monoxide

c. Lead       d. Sulpher dioxide

9. The following is caused by Permanent hardness of water except:

a. Mag. sulfate b. Cal. chloride

c. Cal. bicarbonate     d. Mag. nitrate

10. The following is a disadvantage of hard water:

a. Spoils the natural color and appearance of cooked food

b. Consumes more soap and detergents

c. Causes scaling of boilers and increased fuel consumption

d. Above all

11. Soiling index is an indicator of:

a. Air pollution    b. Water pollution

c. Excreta pollution   d. Sand pollution

12. Audiometer measures the:

a. Frequency of sound

b. Hearing ability

c. Intensity of sound

d. Noise in the meeting hall

13. Most harmful radiation is:

a. Beta particles   b. Alpha particles

c. Protons        d. Gamma rays

14. Prolonged exposure to high-temperature excessive sweating and circulatory failure is called Heat exhaustion.

15. Working in an environment with high temperature, and lack of sweating is called Heatstroke.

16. Body pain due to working in an environment with high temperatures is called Heat cramps.

17. Prolonged exposure to heat resulting in fainting is called Heat syncope.

18. The following type of radiation has the deepest penetrating ability:

a. Beta particles        b. X-ray

c. Alpha particles      d. Gamma rays    

19. Kata thermometer is measuring the:

a. Minimum temperature

b. Radiant heat

c. Cooling power of the air

d. Maximum temperature

20. Most effective sanitation barrier is:

a. Protection of foods

b. Protection of water supplies

c. Control of flies

d. Segregation of feces and its proper disposal

21. Food and vegetable-related wastes are called Garbage.

22. Solidwastes from houses, streets, and industries in the city are called Refuse.

23. Domestic refuse like plastics, paper, wood, metal, etc. are called Rubbish.

24. Wastewater containing solid and liquid excreta is called Sewage.

25. Wastewater without human excreta is called Sullage.

26. Solids settle down in the septic tank is called Sludge.

27. Lighter solid with grease and fat rise to the surface is called Scum.

28. Liquid that passes out of the outlet pipe contains more bacteria, ova, cysts, and organic matter and is called Effluent.

29. The following is the most unsanitary method of refuse disposal goes:

a. Burial                b. Dumping

c. Composting      d. Sanitary landfill

30. In which type of latrine is required ‘Auger’?

a. Trench            b. Borehole

c. Water seal       d. Dug well

31. Shallow Trench latrine is used for camps of short duration and a deep trench latrine is used for camps of long duration.

32. The amount of sewage that flows through the sewage system in 24 hrs. is called Dry weather flow.

33. Incineration is the best method for hospital waste management or the best method where land is unavailable.

34. Wastewater including solid and liquid excreta is called:

a. Sullage             b. Refuse

c. Sewage             d. Garbage

35. Aerobic digestion of sludge takes place in:

a. Activated sludge  

b. Trickling filter

c. Broad irrigation

d. Septic tank

36. The choice for camps of short duration is:

a. Pit latrine     b. Aqua privy

c. Trench hole    d. Chemical closet

37. In rural areas waste disposal can be managed by:

a. Burning         b. Manure pit

c. Dumping        d. Composting

38. Globe thermometer is an instrument that is used to measure radiant heat.

39. Anemometer is used to measure high wind velocities.

40. Kata thermometer is used to measure low air velocities.

41. Sling psychrometer is used to measure relative humidity.

42. Under high atmospheric pressure, the most fatal complication that can happen to drivers is:

a. Myocardial infarction

b. Rupture of the spleen

c. Pulmonary edema

d. Air embolism

43. Fatal dose of total body irradiation is:

a. 50 roentgen   b. 25 roentgen

c. 400 roentgen    d. 800 roentgen

44. Noise pollution control can be managed by:

a. Legislation

b. Protection of exposed persons

c. Control of noise at source

d. Above all

45. Auditory fatigue presents at:

a. 80 dB         b. 90 dB

c. 100 dB        d. 65 dB

46. Excessive nitrate in drinking water can lead to:

a. Hypothyroidism

b. Nephrotoxicity

c. Encephalomalacia

d. Methemoglobinemia

47. Sodium permutit as a compound is used for:

a. Disinfection of large body of water

b. Removal of the hardness of water

c. Testing the residual chlorine

d. Disinfection of water of well

48. The given statement are standards for water quality for drinking water except:

a. Nitrites should be zero

b. Turbidity must be less than 5 units

c. Desirable level of chloride is 200 mg/L

d. Total hardness should be below 50 mg/L

49. During chlorination of the well, the following process is done except:

a. Estimation of chlorine demand

b. Estimation of volume

c. Contact period of one hour

d. Put bleaching powder directly into the well  

50. Free chlorine levels mentioned in drinking water are:

a. 1 mg/L for one hour

b. 0.5 ml/L for 1 hour

c. 2 mg/L for one hour

d. More than 2 mg/L for 1 hour

51. Orthotoludine-arsenite test determines the:

a. Hardness of water

b. Mixed chlorine in the water

c. The dose of bleaching powder required for disinfection of water

d. Both free and mixed chlorine of water separately

52. In normal dose, chlorination does not effect

a. HIV            b. Shigella

c. Polio virus       d. Salmonella

53. …….. is not a waterborne disease:

a. Poliomyelitis, Giardiasis

b. Weil’s disease

c. Kala-azar     d. Roundworm

54. Salt concentration in seawater is:

a.  2%          b. 1.5%

c.   3.5%        d. 5%

55. In nature, the purest water is from:

a. Ponds          b. Rain

c. Lakes           d. Springs

56. Advantages of groundwater has the following except:

a. Likely to be hard

b. Usually requires no treatment

c. Supply is likely to be certain even during the dry season

d. Likely to be free from pathogenic organisms

57. All are true about slow sand filters except:

a. Filters are washed by scraping the sand bed

b. Removal of bacteria is better achieved than rapid sand filters

c. Operation is highly skilled

d. Occupies a large area

58. Action of slow sand filter depends on:

a. Superficial layer

b. Zoogleal layer

c. Size of sand particles

d. Sand compactness

59. The statements are true about chlorination except:

a. Water should not be turbid

b. The demand for chlorine should be estimated

c. Contact period is 30 minutes

d. Free chlorine 0.5 mg/L for 1 hour

60. The following is correct about standards of water quality:

a. Allowable ph of drinking water is between 6.5 and 8.5

b. Soft water is corrosive to water pipes

c. Presence of ammonia compromises disinfection efficiency

d. Above all

61. The following is not correct about ultraviolet irradiation for water purification:

a. Useful in turbid water also

b. Quartz mercury lamps used for UV radiation

c. Overexposure has no harmful effect

d. Useful for institutional system

62. Horrock’s apparatus is used to calculate the dose of:

a. Chlorine gas

b. Perchloron only

c. Potassium permanganate

d. Bleaching powder

63. Coliform organisms cover:

a. Any gram negative motile bacilli

b. E.coli

c. Aerobic and facultatively anaerobic gram-negative, non- sporing, motile, and non-motile rods capable of fermenting lactose

d. none

64. Permanent and temporary hardness can be removed by:

a. Permutit process    b. Boiling

c. Addition of lime      d. Above all

65. Photochemical oxidant responsible for pollution is:

a. Aldehydes        b. Ozone

c. Benzene          d. Vinyl chloride

66. Air pollution can lead to the following one:

a. Impetigo   b. Bronchial asthma

c. Chronic bronchitis

d. None of the above

67. Permanent hearing loss happens with continuous exposure to noise over:

a. 50 dB           b. 75 dB

c. 120 dB         d. 100 dB

68. The following is non-ionizing radiation:

a. UV radiation

b. Alpha radiation

c. Gamma radiation

d. Beta radiation

69. The following is not a transient symptom of high altitude sickness:

a. Oliguria     b. Nausea

c. Insomnia    d. Impaired vision

70. Phono is the psycho-acoustic index of loudness.

71. The definition of overcrowding is 2 persons above 9 years of age, not husband and wife, of the opposite sex, are obliged to sleep in the same room.

72. The noise level of…………., then rupture of the eardrum may happen:

a. 80 dB             b. 70 dB

c. 130 dB          d. 160 Db

73. In-hospital ward, the allowable noise level is:

a. 20-35           b. 40-45

c. 10-15            d. 50-60

74. Factor responsible for smog is:

a. Temperature inversion

b. Increase in humidity

c. Heat island phenomenon

d. Lack of air movement

75. The maximum floor area per person for occupancy is:

a. 55 sq. ft            b. 75 sq. ft

c. 100 sq. ft           d. 120 sq. ft

76. The following are physiological changes caused by noise except:

a. Reduced night vision

b. Pupillary dilatation

c. Rise in intracranial pressure

d. Rise in blood pressure and heart rate

77. Unit of absorbed dose of radiation is:

a. Joule per kg       b. Rad

c. Roentgen            d. Coulomb/kg

78. Frequency range of ……..then, temporary hearing loss happens:

a. 9000-11000 Hz

b. 4000-6000 Hz

c. 3000-5000 Hz

d. 7000-9000 Hz

79. Per year total natural radiation is:

a. 0.5 rad        b. 1 rad

c. 0.1 rad         d. 0.01 rad

80. Oxidation pond is a method used for:

a. Disposal of sullage

b. Water purification

c. Sewage treatment

d. Solid waste disposal

81. Sullage contains:

a. Inorganic waste

b. Wastewater from the kitchen

c. Solid vegetable waste matter

d. Waste containing human excreta

82. Best method of disposal of hospital waste/refuge is Incineration.

83. Which type of latrine is used ‘Trap’

a. RCA   latrine

b. Borehole latrine

c. Chemical closet

d. Dug well latrine

84. Where land is available, then the most satisfactory method of refuse disposal is:

a. Composting        b. Dumping

c. Controlled tipping

d. Incineration

85. The depth of the pit latrine is:

a. 3-5 feet         b. 6-10 feet

c. 5-7 feet         d. 10-12 feet

86. Controlled tipping is a method of disposal of:

a. Sullage      b. Sewage

c. Refuse       d. Excreta

87. The depth of the water seal in the RCA latrine is 2 cm.

88. For a small community, an inexpensive and efficient method of sewage disposal is:  

a. Trickling filter       b. River outfall

c. Oxidation pond      d. Activated sludge

89. The given options are indicators of the organic content of the sewage:

a. Biochemical oxygen demand

b. E. coli count

c. Suspended solids

d. All of above

90. From a source of contamination, drinking water must be ….. Feet away:

a. 25              b. 70

c. 50               d. 100

91. Trench method of refuge disposal is a type of Controlled tipping.

92. Strength of sewage is termed as of all except:

a. Chemical oxygen demand

b. E. coli count

c. Suspended solids

d. Biochemical oxygen demand

93. An oxidation pond requires…………for proper functioning:

a. Algae, human pathogenic bacteria, and sunlight

b. Algae, sunlight, and ferns

c. Algae, saprophytic bacteria, and sunlight

d. Algae, scavenging bacteria, and sunlight

94. All are true about septic tanks except:

a. Anaerobic oxidation inside and aerobic oxidation outside

b. Minimum capacity should be at least 5 hundred gallons

c. Covered with concrete slab and provided with a manhole

d. Standing period is 1 week

95. Biochemical oxygen demand of strong sewage is:

a. 50 mg/L              b. 200 MG/L

c. 150 mg/L             d.300 mg/L

96. Allowable radiation exposure is:

a. 1 rad per year         b. 4 rad/year

c. 6 rad/year               d. 7 rad/year

97. At high altitude, a person having suffered from pulmonary edema requires immediate:

a. Artificial respiration

b. Suction of pulmonary fluids

c. Antibiotic therapy

d. Carry the patient to the lower altitude

98. The given options are not the physiological effect of low pressure at high altitude:

a. Increased cardiac output

b. Increased respiration

c. Increased concentration of urine

d. Increased concentration of Hb

99. Guinea worm disease found where there are:

a. Dug wells        b. Step wells

c. Artesian wells    d. Tube wells

100. ..........provides the safest water and are most satisfactory sources of water supply:

a. Springs        b. Shallow well

c. Deep well      d. Artesian well

  Conclusion:-I hope that the above MCQs and answers increased your knowledge and get success in your life. If u have any queries then comment to me at sarojnepal2059@gmail.com