Q. No.The material generally used for soundproofing rooms like a recording studio or an auditorium is:
1.
Cotton
2.
Coir
3.
Wood
4.
Styrofoam
The expanded form of DDT is:
1. Dichloro diphenyl trichloroethane
2. Dichloro diethyl trichloroethane
3. Dichloro dipyridyl trichloroethane
4. Dichloro diphenyl tetrachloroacetate
Which of the following material takes the longest time for biodegradation?
| 1. | Cotton | 2. | Paper |
| 3. | Bone | 4. | Jute |
Choose the incorrect statement:
| 1. | The Montreal Protocol is associated with the control of the emission of ozone-depleting substances |
| 2. | Methane and carbon dioxide are greenhouse gases |
| 3. | Dobson units are used to measure the oxygen content of air |
| 4. | Use of incinerators is crucial to the disposal of hospital wastes |
Among the following, which one causes the maximum indoor chemical pollution?
1. Burning coal
2. Burning cooking gas
3. Burning mosquito coil
4. Room spray
The green scum seen in the freshwater bodies is:
1. Blue-green algae
2. Red algae
3. Green algae
4. Both 1 and 3
The loudness of a sound that a person can withstand without discomfort is about:
| 1. | 150 dB | 2. | 215 dB |
| 3. | 30 dB | 4. | 80 dB |
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