21). The percentage of pure gold in 18 carat gold is
| A). 1 |
| B). 0.8 |
| C). 0.75 |
| D). 0.6 |
|
22). Zinc is not present in
| A). brass |
| B). bronze |
| C). solder |
| D). German silver |
|
23). Dynamite was invented by
| A). Edison |
| B). Fleming |
| C). Nobel |
| D). Bell |
|
24). Periodic Table was given by
| A). Faraday |
| B). Mendeleev |
| C). Arrhenius |
| D). Lavoisier |
|
25). Gas Law was given by
| A). Boyle |
B). Ostwald
|
| C). Arrhenius |
| D). Faraday |
|
26). Reduction is addition of
| A). hydrogen |
B). water
|
| C). oxygen |
| D). benzene |
|
27). The galvanized iron pipes are coated with
| A). tin |
| B). lead |
| C). copper |
| D). zinc |
|
28). Which one of the following is a mixture?
| A). Lime |
| B). Table salt |
| C). Sugar |
| D). Sea water |
|
29). Which one of the following is a Green House Gas ?
| A). Oxygen |
| B). Nitrogen |
| C). Carbon dioxide |
| D). Ozone |
|
30). The tallest living tree is
| A). Eucalyptus |
| B). Palm tree |
| C). Sequoia |
| D). Tree fem |
|
