| 1 |
The main pollutant of leather tanneries in the waste water is due to |
- A. Lead
- B. Chromium VI
- C. Copper
- D. Chromium III
|
| 2 |
Thickness of the atmosphere is |
- A. 100 km
- B. 500 km
- C. 1000 km
- D. 1500 km
|
| 3 |
Thickness of atmosphere is about how much kilometer above the surface of warth |
- A. 100 km
- B. 1000 km
- C. 10,000 km
- D. unlimited
|
| 4 |
The normal amount of overhead ozone is. |
- A. 300 DU
- B. 350 DU
- C. 400 DU
- D. 450 DU
|
| 5 |
The avoid the formation of toxic compounds with chlorine which substance is used for disinfecting water |
- A. KMnO<sub>4</sub>
- B. O<sub>3</sub>
- C. Alums
- D. Chloramines
|
| 6 |
A quality of raw water is improved by |
- A. Reduction
- B. Aeration
- C. Dehydration
- D. Incineration
|
| 7 |
The pH range of the acid rain is. |
- A. 7-6.5
- B. 6.5-6
- C. 6-6.5
- D. Less than 5
|
| 8 |
Half mass of atmosphere gases is present in. |
- A. 5-6 km distance above the surface of earth
- B. 10 km above the surface
- C. 100 km above the surface
- D. 56 km above the surface
|
| 9 |
The disease can be eradicated by using pesticides. |
- A. Malaria
- B. Yellow fever
- C. Sleeping sickness
- D. All of these
|
| 10 |
In which layer of atmosphere, ozone is present. |
- A. Thermosphere
- B. Mesosphere
- C. Stratosphere
- D. Troposphere
|