21. Wrought iron is manufactured from pig iron by
22. Pig iron is manufactured from the ores by
23. Quick lime is
(i) Slow in setting
(ii) Rapid in slacking
(iii) Good in strength
(i) Slow in setting
(ii) Rapid in slacking
(iii) Good in strength
24. Percentage of carbon content in mild steel is
25. Wrought iron is used for
26. Cast iron is used for
27. Bulking of sand is caused due to
28. Initial setting of cement is caused due to
29. Early attainment of strength in rapid hardening cement is mainly due to
30. Gneiss is obtained from
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