Exercise :: General Science - Synthetic Materials
- General Science - Elements and Metals
- General Science - Measurements
- General Science - Nuclear Science
- General Science - Synthetic Materials
| 21. | The type of glass used in making lenses and prisms is |
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| 22. | Which one of the following is the petroleum wax? |
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Answer: Option A Explanation: Paraffin wax is obtained from petroleum by dewaxing light lubricating oil stocks. It is used in candles, wax paper, polishes, cosmetics, and electrical insulators. It assists in extracting perfumes from flowers, forms a base for medical ointments, and supplies a waterproof coating for wood. In wood and paper matches, it helps to ignite the matchstick by supplying an easily vaporized hydrocarbon fuel.
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