SBTE Environment Engg. Previous Year Question | 2020 (Even) - Polytechnic Wallah

 

2020 (Even)
Environment Engg.
 

 

 1.Per capita water demand is calculate in

liters........

 

(a) Per person per day

(b) Per person per hour

(c) Both (a) and (b)

(d) None of these.    

 

2.As compared to geometrical increase method of forecasting population, arithmetical increase method gives:

 

(a) Higher value

(b) Lesser value

(c) Same value

(d) All of the above

 

3.The devices installed for drawing water from the sources are called:

 

(a) Intakes

(b) Filters

(c) Outlets

(d) Aquifers

 

4.Water that occurs below the surface of the earth is called: 

 

(a) Surface water

(b) Subsurface water

(c) Both

(d) None of these

 

5.Manhole covers are usually made of:

 

(a) Cast iron

(b) Cement

(c) Wood

(d) All of the above

 

 

 

6.PH.value representing a stronger acid is:

 

(a) 1

(b) 2

(c) 5

(d) 10

 

7.Permanent hardness of water may be

removed by:

(a) Lime soda process

(b) Demineralization process

(e) Both

(d) None of these

 

8.Which of the following chemical may be used for disinfection of water?

(a) Chlorine

(b) Ozone

(c) Chlorine-amonia

(d) Any of the above

 

9.The factor/factors affecting per capita demand of water is / are:

 

(a) Size of city

(b) Quality of water

(c) Climatic condition.

(d) All of the above

 

10.The first stage in water treatment is:

 

(a) Coagulation

(b) Filtration

(c) Disinfection

(d) Screening

 

11.Most common surface water supply source is:

 

(a) Sea

(b) River

(c) Both (a) and (b)

(d) None of these

 

 

 

 

 

 

 

 

12.Liquid wasters from kitchens and bathrooms is called:

 

(a) Rubbish

(b) Garbage

(c) Refuse

(d) Sullage

 

13.The permissible amount of nitrites present in potable water is ..

 

(a) Nil

(b) 10 ppm

(c) 20ppm

(d) 30ppm

 

14.Trickling filters are used to remove:

 

(a) Suspended solids

(b) Organic matter

(c) Both (a) and (b)

(d) None of these

 

15.Fresh sewage is usually:

 

(a) Neutral

(b) Acidic

(e) Alkaline

(d) None of these

 

16.In septic tank, the decomposition of organic matters is done by:

 

(a) Aerobic bacteria

(b) Anaerobic bacteria

(c) Both (a) and (b)

(d) None of these

 

 

 

17.Air pollutants common to urban environment  are:

 

(a) Sulphur dioxide

(b) Hydrocarbon

(c) Particulate matter

(d) All of the above

 

18.If organic matter increases in be sewages, the demand of oxygen will:

 

(a) Increase

(b) Decrease 

(c) Remains constant

(d) None of these

 

19.B.O.D. means:

 

(a) Biological oxygen demand

(b) Biological ozone demand

(c) Biochemical oxygen demand

(d) All of the above

 

20.The growth of algae is useful in.

 

(a) Slow sand filter

(b) Oxidation pond

(c) Both (a) and (b)

(d) None of these