8
MCQ (Single Correct Answer)
Which of the following material takes the longest time for biodegradation?
A
Cotton
B
Paper
C
Bone
D
Jute
9
MCQ (Single Correct Answer)
Choose the incorrect statement.
A
The Montreal protocol is associated with the control of emission of ozone depleting substances
B
Methane and carbon dioxide are green house gases
C
Dobson units are used to measure oxygen content
D
Use of incinerators is crucial to disposal of hospital wastes
10
MCQ (Single Correct Answer)
Among the following which one causes more indoor chemical pollution?
A
Burning coal
B
Burning cooking gas
C
Burning mosquito coil
D
Room spray
11
MCQ (Single Correct Answer)
The green scum seen in the freshwater bodies is
A
blue green algae
B
red algae
C
green algae
D
Both (a) and (c)
12
MCQ (Single Correct Answer)
The loudness of a sound that a person can withstand without discomfort is about
A
150 dB
B
215 dB
C
30 dB
D
80 dB