| 1 |
If a key is stiff in a lock, rub the end of the key a soft pencil, which types of elements we obtain. |
- A. Graphite
- B. Silver
- C. Gold
- D. Paltinum
|
| 2 |
The percentage of Neon by volume is. |
- A. 0.002
- B. 0.9
- C. 0.02
- D. 0.00055
|
| 3 |
The form of carbon which is not crystalline is. |
- A. Charcoal
- B. Graphite
- C. Bucky Ball
- D. Diamond
|
| 4 |
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
|
| 5 |
What type of liquid has abnormal freezing and boiling point. |
- A. Water
- B. Juice
- C. Petrol
- D. Diesel
|
| 6 |
The process by which green plants manufacture their food is |
- A. respiration
- B. photosynthesis
- C. oxidation
- D. nitrogen fixation
|
| 7 |
The sun almost entirely consists to the element |
- A. oxygen
- B. iron
- C. phosphorus
- D. hydrogen
|
| 8 |
One of the essential part of all living things on the earth |
- A. carbon
- B. nitrogen
- C. hydrogen
- D. oxygen
|
| 9 |
Teh process of converting atompspheric nitrogen to useable from is called. |
- A. Nitrogen cycle.
- B. Carbon cycle
- C. Nitrogen fixation
- D. Water cycle
|
| 10 |
The process which loops the amount of nitrogen constant in air is |
- A. nitrogen fixation
- B. nitrogen cycle
- C. oxidation
- D. photosynthesis
|
