21.
The type of glass used in making lenses and prisms is
A. jena glass
B. soft glass
C. pyrex glass
D. flint glass
Answer & Explanation
Answer: Option D
Explanation:
No answer description available for this question. Let us discuss.
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22.
Which one of the following is the petroleum wax?
A. Paraffin wax
B. Jonoba wax
C. Carnauba wax
D. Bees wax
Answer & Explanation
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.