11. Oil varnish generally consists of
12. Plastics are compounds of carbon with element
13. The most commonly used retarder in cement is
14. The cement becomes unsound by the presence of excess
15. Resins are
16. Which of the following ingredients of the brick earth enables the brick to retain its shape?
17. Strength of cement concrete primarily depends upon
18. Quick setting cement is produced by adding
19. In order of increasing percentage of silica, the correct sequence is
20. The main ingredients of Portland cement are
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