| 121. | Due to which reaction carbon dioxide is produced in a normal fire extinguisher? |
A. sodium carbonate and dilute HCI | |
B. sodium bicarbonate and dilute H₂SO₄ | |
C. limestone and dilute H₂SO₄ | |
D. Marble Powder and Dilute HCI |
| 122. | fire extinguishing gas |
A. hydrogen | |
B. oxygen | |
C. nitrogen | |
D. Carbon dioxide |
| 123. | Which glass is used in the manufacture of electric bulb? |
A. crown glass | |
B. pyrex glass | |
C. flint glass | |
D. fiber glass |
| 124. | Which of the following is not a noble gas? |
A. hydrogen | |
B. helium | |
C. Nian | |
D. organ |
| 125. | Non-metals are generally poor conductors of electricity, but graphite is a good conductor of electricity because |
A. it is a form of carbon | |
B. it has loosely bound electrons | |
C. it is brittle | |
D. It forms primary oxide |
| 126. | The inert gas used as a beacon light is? |
A. kr | |
B. Ar | |
C. He | |
D. no |
| 127. | Which of the following acids is a mineral acid? |
A. citric acid | |
B. hydrochloric acid | |
C. ascorbic acid | |
D. tartaric acid |
| 128. | Phosphorus is found in abundance in |
A. protein | |
B. fat | |
C. vitamins | |
D. none of these |
| 129. | Which of the following is a supercooled liquid |
A. ammonia | |
B. Ice Cream | |
C. wood | |
D. glass |
| 130. | Crystalline is the crystalline form of which of the following |
A. lime stone | |
B. glass | |
C. silica | |
D. alumina |