OJEE 2017 Question Paper M.Tech Environmental Engineering

FOR OJEE EXAM PREPARATION

OJEE 2017
Question Paper ·
M.Tech Environmental
Engineering
EXAM YEAR TYPE SUBJECT

OJEE 2017 Question Paper M.Tech Environmental Engineering

Notes · Sample Papers · Previous Year Papers · Mock Tests

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1. The list of industrial sources of air pollution and their emissions are given. Match the following.

P.Ammonia 1. Carbon monoxide

Q. Plating 2. Particulates

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R. Fertilizers 3. Metal fumes

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a. P-1, Q-4, R-3 b. P-3, Q-4, R-2

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c. P-1, Q-3, R-2 d. P-2, Q-1, R-3
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2. If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was
found to be 5 ppm, B.O.D. of the sewage is

a. 200 ppm b. 225 ppm

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c. 250 ppm d. 275 ppm

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m loss and waste of water.
Reason R: Higher distribution pressure causesemore
3. Assertion A: The consumption of water increases with increase in the distribution pressure.

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a. A is true but R is false a g b. Both A and R are true but R is not the correct
explanation of A

c. A is false but R is true d. Both A and R are true and R is the correct
explanation of A

4. Match the contaminants with the disease.

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c. oQ. Cadmium
P. Arsenic 1. Itaiitai

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2. Silicious

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R. Coal 3. Dysathria

S. Mercury 4. Skin caner

a. P-2, Q-1, R-4, S-3 b. P-1, Q-2, R-3, S-4

c. P-4, Q-3, R-2, S-1 d. P-4, Q-1, R-2, S-3

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5. Which of the following is true about carbon monoxide?

a.Single largest source is from internal b.Results from the actions of ultraviolet light on
ozone
combustion engines

c.Causes acid rain d.Leading cause of cancer in smokers

6. Disinfection of water is done by

a. Ozone b. Filtration

c. Heating and cooling d. Passing chlorine

7. Match the following and identify the correct answer.

P. PO4- 1. Global warming

Q. N2O 2. Eutrophication

R. NO3- 3. Respiratory disease

S. NO 4. Limiting nutrient

a. P-4, Q-1, R-2, S-3 b. P-1, Q-2, R-3, S-4

c. P-4, Q-1, R-2, S-3 d. P-2, Q-1, R-3, S-4

8. Tolerable limit of nitrogen oxides in air is __________ ppm.

a. 0.5 b. 2.5

c. 5 d. 7.5

9. In measurement of decibel (dB), the reference intensity taken is

a. 1*10-12 W/m2 b. 10*10-12 W/m2

c. 0.1*10-12 W/m2 d. 5*10-12 W/m2

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10. Match the following and choose the correct answer.

P. 21st March 1. World atmosphere day

Q. 10thApril 2. World water and sanitation day

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R. 22nd May

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3. World forest day

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nd

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S. 22 March 4. Bio-diversity day

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a. P-2, Q-1, R-4, S-3 b. P-3, Q-1, R-4, S-2
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c. P-4, Q-3, R-2, S-1 d. P-1, Q-4, R-3, S-2

11. The toxicity of Ca-45 is related to

a. Thyroid b. Bone

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c. Teeth d. Blood

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12. Formula of bacterial cells is

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a. C5H7O2N b. C6H12O6

c. C7H5O2N d. C2H7O3N

13. The working conditions in imhoff tanks are

a. Aerobic in lower compartment and b. Aerobic only

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anaerobic in upper compartment

mAnaerobic in lower compartment and .
c. oc.aerobic d. Anaerobic only
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in upper compartment

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a 14. In a sludge tank, the gas mainly produced, is

a. Oxygen b. Nitrogen

c. Carbon dioxide d. Methane

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15. What percentage of total world production of carbon dioxide do the developed
countries contribute?

a. About 25% b About 60%

c. About 75% d. About 90%

16. Exposure to small amount of __________ results in high blood pressure & heart
disease in human beings.

a. Mercury b. Asbestos

c. Hydrogen sulphide d. Cadmium

17. Sulphur dioxide can be measured by

a. Ultraviolet pulsed fluorescence b. Permeation tube calibration

c. Both d. None

18. Ground water has to be treated with impurities like hardness, microorganisms and low
dissolved Oxygen concentration along with different gases. What will be the proper
treatment process from the following options:

a. Sedimentation; Filtration; Coagulation b. Aeration; Sedimentation; Softening;
Flocculation; Disinfection Disinfection

c. Aeration; Sedimentation; lime soda process; d. Screen; Filtration; Softening; Disinfection
Filtration

19. The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour
detention period for tanks is recommended, the rate of flow of sewage per hour, is

a. 204 cu m b. 194 cu m

c. 214 cu m d. 204 cu m

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20. Lead emissions since the early 1980s have

a. Increased b. Decreased

c. Remained same d. Cannot be answered

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21. The solar energy distributed per unit surface area of earth is

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2 2

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a. 142 W/m b. 242 W/m

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c. 342 W/m2
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22. The normal length of a sedimentation tank to remove suspended particles from water should not be
more than _____ time of its Width:

a. 2 b. 4

c. 6 d. 8

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23. The algae dies out in the zone of
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a. Degradation
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c. Cleaner water a d. Active decomposition

24. The self-cleaning velocity normally adopted for sewers is?

a. 0.85 m/sec b. 0.75 m/sec

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c. 0.45 m/sec d. 0.55 m/sec

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A: Slow sand filters are more efficient in removal of bacteria than. rapid sand filters.
c. o25. Assertion s em
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Reason R: The sand used in slow sand filters is finer than that in rapid sand filters.

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ag a.Both A and R
explanation of A
are true but R is not the correct b. A is true but R is false

c. Both A and R are true and R is the correct d. A is false but R is true
explanation of A

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26. The suitable method of forecasting population for a young and rapidly increasing city is

a. Arithmetical increase method b. Incremental increase method

c. Graphical method d. Geometrical increase method

27. Pick up the incorrect statement from the following :

a. The process of decomposing the organic b. Sludge digestion is carried out in sludge tank
matter under controlled anaerobic conditions, is
called sludge digestion

c. The gases produced in sludge digestion d.The gases produced in sludge digestion process,
process, contain 75% carbon dioxide contain 75% methane

28. The ambient lapse rate generally is

a. 6.5 ºC/km b. 10 ºC/km

c. -6.5 ºC/km d. -10 ºC/km

29. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of
specific gravity 1.2, the minimum velocity required for removing the sewerage, is

a. 0.45 m/sec b. 0.35 m/sec

c. 0.55 m/sec d. 0.25 m/sec

30. The minimum width of a sewer trench in mm must be greater than; where D is the external diameter
of sewer in mm:

a. 1.5 D+ 100 b. 1.5D +300

c. 1.5D +400 d. D +1000

31. Select the correct relationship between porosity (N), specific yield (Y) and specific retention
(R)

a. N = Y + R b. Y = N + R

c. R = N + Y d. Y > (R + N)

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32. The Design Period of Ground Water supplies are usually selected as:

a. 5 Years b. 10 Years

c. 25 Years d. 50 Years

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33. The minimum area of land desirable for sanitary landfill that is sufficient to operate for at least:

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a. One year b. Six months

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c. Nine months
a d. None of these
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34. In Indian context, where rainfall is mainly confined to one season, the suitable sewerage system
will be

a. Combined system b. Partial combined system

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c. Partial separate system d. Separate system

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35. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand

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(BOD) and Chemical oxygen demand (COD)

a. TOD > BOD > COD a g b. TOD > COD > BOD

c. BOD > COD > TOD d. COD > BOD > TOD

36. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the
beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the DO concentration was 5 mg/l.

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The BOD of raw sewerage is

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b. 250 mg/l

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a
a 37. Ozone of found in

a. Mesosphere b. Stratosphere

c. Ionosphere d. Exosphere

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38. If BOD of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population
equivalent of the town is

a. 40000 b. 400000

c. 100000 d. 10000

39. Which of these is not caused/aggravated by atmospheric pollution?

a. Asthma b. Nice sunsets

c. Hay fever d. Global warming

40. The major gases produced from sanitary landfill are due to:

b. Aerobic decomposition of biodegradable
a. Anaerobic decomposition of
organic matter
biodegradable organic matter
d. None of these
c. Anaerobic decomposition of non-
biodegradable organic matter

41. In a well-planned city, developed recently the layout of distribution pipes system generally adopted
is:

b. Grid Iron system
a. Ring system
d. All of the above
c. Radial system

42. In general, the organic waste material that decomposes rapidly (3 to 5 years) is:

b. News paper
a. Food waste
d. All of these
c. Leaves

43. Groundwater is usually free from

b. Suspended impurities
a. Dissolved impurities
d. None of the above
c. Both of these

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44. The most common cause of acidity in water is

b. Oxygen
a. Carbon dioxide
d. Nitrogen
c. Hydrogen

45. Which of the following is a fermentation product of molasses?

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a. a.Acetone a. b.Methanol

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b. c. Ammonia c. d. Formaldehyde

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46. The process of nutrient enrichment is termed as

a. a.Eutrophication b. b.Schistosomiasis
c. c. Enrichment d. d. Limiting nutrients

47. Which microorganism can live alone?

a. a.Fungi b. Amoeba

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b. c. Algae c. d. All of the above

48. Temporary hardness of water may be removed by adding
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a. Calcium chloride
c. Calcium hydroxide
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49. Coliform bacteria in water is an indication of the presence of

a. Excess fertilizer b. Radioactive wastes
c. Human faeces d. Decaying animals and plants

50. Nitrous oxide is also known as

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a. Laughing gas b. Natural gas

c. oc. Tear gas d. Marsh gas
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a a. Increases b. Decreases

d. None of the above
c. Remains unaffected

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52. Which of the following compounds is widely used for algae control

b. Copper sulphate
a. Sodium sulphate
a. Calcium chloride
c. Sodium chloride

53. Which of the following might retards the self-purification of stream

b. sunlight
a. Higher temperature
d. None of the above
c. Satisfying oxygen demand

54. Standard Bod is measured at

b. 25 C˚– 3 Day
a. 20˚C – 1 Day
d. 30˚C – 5 Day
c. 20˚C – 5 Day

55. When the total hardness of water is greater than its total alkalinity, the carbonate hardness will be
equal to.

a. Total hardness - total alkalinity b. Total alkalinity

c. Total hardness d. No carbonate hardness

56. The chemical most commonly used to increase speed of sedimentation of sewage is

a. Copper sulphate b. Sodium permanganate
c. Sulphuric acid d. Lime

57. Bag filter design is dependent on gas temperature, as it affects the gas density & viscosity and the selection
of filtering material. The pressure drop in a bag filter is

a. Inversely proportional to viscosity of gas b. Proportional to the viscosity & density of the gas

c. Proportional to the pressure of the gas d. both (b) and (c)

58. Most of the bacteria is

b. Saprophytic
a. Parasitic
d. Anaerobic
c. Pathogenic

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59. The rate of BOD exerted at any time is

b. Directly proportional to BOD remaining
a. Directly proportional to BOD satisfied
d. Inversely proportional to BOD remaining
c. Inversely proportional to BOD satisfied

60. Which of the following unit works in aerobic conditions

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b. Sedimentation tank

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a. Sludge digestion tank

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d. Trickling filter
c. Activated sludge

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