11. The hardest rock is
12. A heavy stone is suitable for
13. For obtaining vinyl chloride acetate, the method used, is
14. For testing compressive strength of cement, the size of cube used is
15. Snowcrete is one of the patent forms of
16. The softest rock is
17. The term frog means
18. Brittleness of cold is due to an excess of
19. The moisture content in a well seasoned timber is
20. The clay to be used for manufacturing bricks for a large project, is dugout and allowed to weather throughout
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