| 181. | Which gas is added to beer before storing it? |
A. chlorine | |
B. oxygen | |
C. Carbon dioxide | |
D. sulfur dioxide |
| 182. | Which of the following gases is present in soft drinks under pressure? |
A. Carbon dioxide | |
B. carbon monoxide | |
C. Nitrogen oxide | |
D. nitrogen |
| 183. | The gas used in soda water is |
A. oxygen | |
B. ammonia | |
C. Carbon dioxide | |
D. sulfur dioxide |
| 184. | dry ice is the solid form of |
A. CO₂ | |
B. Carbon dioxide | |
C. nitrogen | |
D. oxygen |
| 185. | Adding yeast to wheat flour to make double roti makes it spongy and soft, because |
A. Yeast being soft makes the dough soft | |
B. The carbon dioxide produced makes the bread spongy. | |
C. yeast breaks down proteins | |
D. Yeast produces acetic acid |
| 186. | Which gas group contributes to the ‘green house effect’ |
A. carbon dioxide and methane | |
B. ammonia and ozone | |
C. carbon monoxide and sulfur dioxide | |
D. carbon tetrafluoride and nitrous oxide |
| 187. | The gas responsible for global warming is – |
A. carbon dioxide | |
B. carbon monoxide | |
C. nitrous oxide | |
D. oxides on nitrogen |
| 188. | What is the material used in solar cells |
A. silicone | |
B. Cerium | |
C. astatine | |
D. vanadium |
| 189. | What is commonly used to make transistors |
A. aluminum | |
B. silicon | |
C. copper | |
D. Silver |
| 190. | What is silicon? |
A. drivers | |
B. semiconductor | |
C. electrical resistance | |
D. insulation |