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1621. Ball bearings are used to reduce friction by
A. applying lubricants to the balls used
B. reducing the area of contact with the use of metallic balls
C. increasing the area of contact with the use of metallic balls
D. None of these
Explanation:
1622. A mixture of salt and sand can be separated by
A. Sublimation
B. Dissolving in water
C. Gravity separation
D. Dry distilation
Explanation:
1623. PVC is obtained by the polymerisation of
A. Propene
B. Vinyl chloride
C. Styrene
D. Acetylene
Explanation:
1624. Which of the following is the combination of the three primary colours used in a colour TV ?
A. Green, Blue, Red
B. Red, Green, Yellow
C. Green, Yellow, Blue
D. Yellow, Blue, Red
Explanation:
1625. Vulcanisation is
A. science of studying volcanoes
B. method to degrade polymeres
C. process connected with the making of voltaic cells
D. process of hardening of rubber by heating it with sulphur
Explanation:
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