101. For making spiral staircases, ideal material is (a) pig iron (b) cast iron (c) wrought iron (d) steel ans- B 102. Purest form of iron is (a) pig iron (b) cast iron (c) wrought iron (d)s steel ans-C 103. Carbon content in wrought iron is (a) 0.15% (b) 0.25 to 1.5% (c) 2 to 4% (d) more than 4% ans-A 104. The ratio of tensile strength to compressive strength of steel is (a) less than 1 (b) equal to 1 (C) more than 1 (d) nothing can be said definitely ans-B 105. Ribs are made on steel wires to increase (a) strength is compression (b) strength is tension (c) bond strength (d) fatigue quality ans-c 106. The property of metal enabling it to be drawn into thin wire is known as (a) malleability (b) ductility (c) toughness (d) plasticity ans-B ise Education, Reprise InnovetiBs 107. The property of the metal enabling it to be trans formed it into diferent shapes by heating is a, b, c, d as per Question No. 106 ans- A 108. The property of metals due t...