Worksheets20/01/26-Civilwar-Overseer Grade 1-Environmental eng. topics
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
Which type of bacteria can survive both in the presence and absence of oxygen?
a)
Aerobic
b)
Anaerobic
c)
Facultative
d)
Pathogenic
2.
Cocci bacteria are characterized by which shape?
a)
Rod shaped
b)
Spiral shaped
c)
Comma shaped
d)
Spherical shaped
3.
Presence of E-coli in water indicates
a)
Industrial pollution
b)
Chemical contamination
c)
Sewage contamination
d)
Hardness of water
4.
Which bacteriological test gives only presence or absence of organisms?
a)
Multiple tube fermentation test
b)
Completed test
c)
Quantitative test
d)
Qualitative test
5.
The incubation condition for the Plate Count Test at higher temperature is
a)
20°C for 48 hours
b)
37°C for 24 hours
c)
37°C for 20 hours
d)
20°C for 24 hours
6.
Which medium is used in the confirmatory test of Multiple Tube Fermentation Test?
a)
Agar medium
b)
Lactose broth
c)
M-Endo medium
d)
Brilliant Green Bile Lactose broth
7.
Which water treatment process removes floating materials?
a)
Plain sedimentation
b)
Filtration
c)
Screening
d)
Disinfection
8.
Fine screens are generally avoided because they
a)
Remove fewer impurities
b)
Are expensive
c)
Are prone to clogging
d)
Reduce treatment efficiency
9.
The condition for 100 percent removal efficiency in sedimentation is
(Vs-Settling velocity,Vo-Overflow velocity)
a)
Vo > Vs
b)
Vo = Vs
c)
Vs > Vo
d)
Vs = 0
10.
The practical depth of a sedimentation tank is approximately
a)
2.0 m
b)
3.5 m
c)
5.0 m
d)
7.0 m
100 %
