| 1. | Which one of the following gases is a fuel for combustion? |
A. hydrogen | |
B. nitrogen | |
C. carbon dioxide | |
D. oxygen |
| 2. | A concentrated solution of which of the following is kept in a fire extinguisher along with concentrated sulfuric acid kept in a bottle? |
A. calcium carbonate | |
B. Sodium chloride | |
C. sodium bicarbonate | |
D. sodium sulfate |
| 3. | In a conventional fire extinguisher, carbon dioxide is produced by the reaction of |
A. Limestone and dilute sulfur | |
B. marble and dilute hydrochloric acid | |
C. sodium bicarbonate and dilute sulfur | |
D. sodium carbonate and dilute hydrochloric acid |
| 4. | Which gas is used in fire extinguishing |
A. helium | |
B. Carbon dioxide | |
C. CO | |
D. oxygen |
| 5. | Water cannot extinguish burning petrol because |
A. A mixture of petrol and water produces a flammable chemical | |
B. Burning petrol instantly vaporizes water | |
C. Petrol floats in water due to its low relative density. | |
D. Water releases oxygen on contact with burning petrol, which helps in burning |
| 6. | Which of the following is not a fuel element |
A. uranium | |
B. thorium | |
C. radium | |
D. helium |
| 7. | Which of the following is not a fossil fuel |
A. Coal | |
B. petroleum | |
C. nitrogen | |
D. water gas |
| 8. | Which of the following is the best fuel in terms of energy released per gram of fuel? |
A. hydrogen | |
B. methane | |
C. ethanol | |
D. butane |
| 9. | Producer gas is a mixture of – |
A. CO + N₂ | |
B. CO₂ + N₂ | |
C. CO + FEMALE + FEMALE | |
D. CO + LOOK |
| 10. | Which of the following is used as propellant or fuel in rockets |
A. liquid hydrogen + liquid nitrogen | |
B. liquid oxygen + liquid nitrogen | |
C. liquid nitrogen + liquid oxygen | |
D. liquid hydrogen + liquid oxygen |