41. The stones obtained by blasting are used as
42. Which of the following stresses is used for identifying the quality of structural steel?
43. Sea sand used in structures causes
44. Cross cut saw is used for
45. Wrought iron contains carbon upto
46. Which of the following sedimentary rocks changes into quartzite by metamorphic action?
47. Non acid-resistant asbestos is:
48. Bitumen completely dissolves in
49. For the manufacture of Portland cement, the proportions of raw materials used, are
50. Galvanising means covering iron with a thin coat of
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