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766. In the manufacturing of safety matches, which of the following materials are used to coat the two sides on match boxes ? 1. Yellow phosphorus2. Glue3. Glass powder4. Red phosphorus
A. 1, 2 and 3
B. 1, 3 and 4
C. 1, 2 and 4
D. 2, 3 and 4
Explanation:
767. Oxidation involves :
A. gains in electrons
B. gain of hydrogen
C. loss of electrons
D. combustion
Explanation:
768. Quartz crystals normally used in quartz colocks etc. is chemically
A. sodium silicate
B. germanium oxide
C. silicon dioxide
D. a mixture of (B) and (C)
Explanation:
769. Red, yellow and blue are known as
A. primary colours
B. complementary colours
C. primary pigments
D. secondary colours
Explanation:
770. Which of the following is used as a lubricant ?
A. Graphite
B. Silica
C. Diamond
D. Iron oxide
Explanation:
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