Environmental Engineering MCQs for Public Service Commission Exam/ All kind of Exams Part 8

1.       Tires & Rubber waste comes under:

a) Yard waste            b) Metal waste             c) Organic waste           d) Paper waste

2.       White Goods waste comes under:

a) Yard waste            b) Metal waste             c) Organic waste           d) Paper waste

                                                                   

       3)   Sewerage sludge comes under:

a) Organic waste category                                    b)Special waste category                                               c)  Yard waste category                                           d) Plastic category

4)  In Rawalpindi, generation of solid waste in 2002 is:

a)  0.65 kg/c/day                       b) 0.75 kg/c/day                                                

c) 0.85 kg/c/day                                        d)  0.95 kg/c/day

5) _________  are used to reduce to desirable sizes for treatment of composting etc.

a) Shredders                                                 b)  separators                                

 c) scrappers                                                  d) both (a) and (b)

6)  Density of Solid Waste varies with:

a) length of time                         b) location                          

c) season                                    d) all of the above

7) Field capacity of un-compacted commingled wastes from residential & commercial sources is about:

a) 20-30%.      b)  30-40%.                      

 c)  40-50%.     d)  50-60%.

8) Typical fusion temp ranges from:

a) 1000-1200F                               b) 2000-2200F                                                

  c) 3000-3200F                              d) 4000-4200F 

9) Almost all organic fraction of MSW can be converted biologically to:

a) solids                           b) liquids                                             c) plasma                              d) gases

10 ) According to mode of operation, the collection system  classified into _______ categories:

a) two                              b) three                                           

 c) four                           d) five

11) There are _______ main types of Haul Container Systems:

a) two                              b) three                                           

 c) four                           d) five

12) Mesophilic Temperature ranges from:

a)    25 ^o to 35^o C              b)      35 ^oto 45^o C                                       

  c)    45 ^oto 55^o C            d)        55 ^o to 65^o C        

13) Psychrophilic Temperature ranges from:

a)    15 ^o to 20^o C                    b) 25 ^o to 30^o C                                      

  c)    35 ^oto 40^o C            d)  45 ^o to 50^o C   

14) Thermophilic Temperature ranges from:           

a) 20 ^o to 30^o C                               b) 30 ^o to 40^o C                                               

  c) 40 ^o to 50^o C                           d) 50 ^o to 60^o C

15) At the ideal moisture level, Optimum oxygen levels are:

a)  15 to 20 per cent                                   b) 25 to 30 per cent                                      ‘

 c) 35 to 40 per cent                    d) 45 to 50 per cent

16) Optimum C/N ratio is:

a) 20                                 b) 30                     c) 40                        d) 50

2. Materials that are a good source of nitrogen are called:

a) Blue                                             b) White                             c) Green                               d) Red

17)  Materials that are high in carbon are called:

a) Brown                                         b) Yellow                            c) Blue                                   d) White

18) Psychrophiles are:

a)    low temperature bacteria                              b) medium temperature bacteria

c) high temperature bacteria                              d) none of the above

19) Mesophiles are;

a)    low temperature bacteria                               b) medium temperature bacteria

c) high temperature bacteria                              d) none of the above

20) Thermophiles are:

a)    low temperature bacteria                               b) medium temperature bacteria

c) high temperature bacteria                             d) none of the above

21) Copper is:

a) Light metal                                b) Heavy metal                                                c) toxic metal                      d) non metal

       21) About _______ of the Earth’s land surfaces (excluding Antarctica) are covered with forest and woodland:

a) 30%                              b) 35%                                              

  c) 40%                         d) 45%

22) The original forest cover of the Earth approached ________ of land area.

a) 20%                              b) 30%                                              

 c) 40%                           d) 50%

•    23) ____________ is a forest harvest technique in which all trees in a particular area are cut, regardless of species or size.

a) Shelter-wood Cutting            b) Selective Cutting

c) Clear-cutting                           d) Biomass harvesting

24. __________ are fires that burn within the organic matter and litter of the soil

a) Ground fires                            b) Surface fires                                c) Crown fires                     d) Plank fire

25) The most comprehensive piece of legislation regulating protection of all species of flora and fauna is the Endangered Species Act (ESA), passed in .

a) 1965                                             b) 1968                                                c) 1971                                                   d) 1973

26) __________ burn on the ground surface, consuming litter as well as the herbaceous and shrubby vegetation of the forest floor.

a) Ground fires                            b) Surface fires                                c) Crown fires                     d) Plank fire

27) ____________ burn treetops as well as low vegetation, usually killing all or almost all above-ground vegetation.

a) Ground fires                            b) Surface fires                                c) Crown fires                     d) Plank fire

28) __________ is a timber-harvesting technique in which only trees of specified size or species are taken, leaving other trees.

       a) Shelter-wood Cutting            b) Selective Cutting

       c) Clear-cutting                           d) Biomass harvesting

29) ________ is a forest harvest technique in which whole trees are chipped and used as fuel or to make pulp.

       a) Shelter-wood Cutting            b) Selective Cutting

       c) Clear-cutting                           d) Biomass harvesting

30) WASA is formed in:

a) 1994                             b) 1995                               c) 1996                                                   d) 1997

31) Public Health Service was established in:

a) 1798                                             b) 1805                                                c) 1808                                                   d) 1810

32) EPA was established in :

a) December 4, 1970         b) December 3, 1970

c) December 2, 1970         d) December 1, 1970

33) Total generation of Solid Wastes in Rawalpindi City is:

a) 703 tons per day       b) 713 tons per day

       c) 723 tons per day       d ) 733 tons per day

34) Specific wt, expressed in material per unit volume, units are:

a) lb/m³                   b) lb/ft³

       c) lb/yd³                 d) lb/in³

35) Lignin content of VS, expressed as a % by _________:

a) Mass                                           b) Volume                                          c) Weight                             d) either (a) and (b)