| 1 |
In 19th century, due to use of petroleum and natural gas: |
- A. Demand of coal became less
- B. No change took place in demand of coal
- C. Coal demand increased
- D. Coal mining was almost stopped
|
| 2 |
World's total estimated coal reserves are: |
- A. 891.531 billion metric tons
- B. 5 trillionmetric tons
- C. 10 trillion metric tons
- D. 15 trillion metric tons
|
| 3 |
In peat coal, carbon content may be: |
- A. Up to 20 percent
- B. Up to 30 percent
- C. Up to 80 percent
- D. Up to 70 percent
|
| 4 |
Quality of coal depends upon: |
- A. Carbon content of coal
- B. Hydrogen content of coal
- C. sulphur content of coal
- D. Silicon content of coal
|
| 5 |
In lignite coal, carbon content may be: |
- A. Only 10 percent
- B. 45 - 65percent
- C. Up to 25percent
- D. Up to 90percent
|
| 6 |
Coal, petroleum, natural gas, nuclear energy and solar energy are: |
- A. Important means of energy
- B. Not means of energy
- C. Nominal means of energy
- D. Unimportant means of energy
|
| 7 |
Historians believe that coal is first commercially mined in: |
- A. China
- B. United Kingdom
- C. India
- D. United States of America
|
| 8 |
In bituminous coal, carbon content may be: |
- A. 20 percent
- B. 50 percent
- C. 60-80 percent
- D. 30 percent
|
| 9 |
Coal reserves of Europe and Russian Federation are, world's total reserves: |
- A. 20 percent
- B. 30percent
- C. 50percent
- D. 44percent
|
| 10 |
Best quality of coal is: |
- A. Anthracite
- B. Bituminous
- C. Lignite
- D. Peat
|
