| 1 |
At the height 880120 km from earth's surface is. |
- A. Troposphere
- B. Mesosphere
- C. Stratosphere
- D. Thermosphere
|
| 2 |
What percentage of nitrogen and oxygen is in the atmosphere. |
- A. 69%
- B. 79%
- C. 9%
- D. 89%
|
| 3 |
On which base atmosphere is divided into four regions? |
- A. Change in pressure
- B. Change in rediation
- C. Change in temperature
- D. Change in volume
|
| 4 |
Ozone depletion was first noticed is. |
- A. 1970's
- B. 1980's
- C. 1990's
- D. 1960's
|
| 5 |
The region of ozone decomposition in stratosphere is. |
- A. 20 km
- B. 30 km
- C. 40 km
- D. 50 km
|
| 6 |
Which gas protects the Earth's surface from ultraviolet radiations? |
- A. CO<sub>2</sub>
- B. CO
- C. N<sub>2</sub>
- D. O<sub>3</sub>
|
| 7 |
Infrared radiations emitted by the Earth are absorbed by. |
- A. CO<sub>2</sub> and H<sub>2</sub>O
- B. N<sub>2</sub> and O<sub>2</sub>
- C. CO<sub>2</sub>and N<sub>2</sub>
- D. O<sub>2</sub>and CO<sub>2</sub>
|
| 8 |
Which is not an air pollutant? |
- A. CO<sub>2</sub>
- B. CO
- C. SO<sub>2</sub>
- D. NH<sub>3</sub>
|
| 9 |
The range of temperature in burning solid waste burning in incinerators is. |
- A. 650 <sup>o</sup>C - 1000 <sup>o</sup>C
- B. 650<sup>o</sup>C - 11000<sup>o</sup>C
- C. 1000<sup>o</sup>C - 2000<sup>o</sup>C
- D. 650<sup>o</sup>C - 1000<sup>o</sup>C
- E. 5000<sup>o</sup>C - 1000<sup>o</sup>C
|
| 10 |
Carbon monoxide is harmful to us because. |
- A. It paralyses the lungs.
- B. It damages lungs tissues.
- C. It reduces oxygen carrying ability of haemoglobin
- D. It makes the blood coagulate.
|
