| 1 |
Oxygen and nitrogen react to form. |
- A. Nitric Acid
- B. Nitrogen oxide
- C. Nitrogen peroxide
- D. Nitrate
|
| 2 |
It is an important constituent of DNA and RNA our body |
- A. Iron
- B. Chlorine
- C. Fluorine
- D. Phosphorus
|
| 3 |
Nitrogen occur in the atmosphere as................. molecules. |
- A. Triatomic
- B. Diatomic
- C. Polyatomic
- D. None of these
|
| 4 |
The amout of carbon dioxide int eh air is increased by. |
- A. Photosynthesis
- B. Respiration
- C. Burning
- D. Evaporation
|
| 5 |
The density of ice at o°C is & nbsp |
- A. 0.918g/cm3
- B. 0.618g/cm3
- C. 0.718g/cm3
- D. 0.8/8 g/cm3
|
| 6 |
The deficiency of iodine in human body casue. |
- A. Goiter
- B. Cancer
- C. Tuberculosis
- D. Cholera
|
| 7 |
The process which increases the temperature in the temperatureis called |
- A. Photosynthesis
- B. Oxidation
- C. Greenhouse effect
- D. Evaporation
|
| 8 |
The percentage of Neon by volume is. |
- A. 0.002
- B. 0.9
- C. 0.02
- D. 0.00055
|
| 9 |
It is not crystalline form of carbon |
- A. charcoal
- B. graphite
- C. buckyballs
- D. diamond
|
| 10 |
It is an organic compound |
- A. natural gas
- B. ammonium
- C. water
- D. sodium chlorides
|
