Category: Materials and Construction

A. Bakelite
B. Polythene
C. Poly vinyl chloride
D. Polystyrene

A. Lead, tin and cadmium
B. Copper, tin and zinc
C. Copper and lead
D. None of these

A. Aluminium, mild steel, stainless steel, concrete & tin
B. Copper, cast iron & high silicon iron (14% Si)
C. Rubber (butyl and hard), silicone rubber & Teflon
D. Glass, graphite, porcelain & stoneware

A. Simple hexagonal
B. Body centred cubic
C. Face centred cubic
D. None of these

A. Harden its surface
B. Soften its surface
C. Improve its reliability
D. None of these

A. Cast iron
B. Steel
C. Ferroalloy
D. None of these

A. Especially resistant to solutions containing H2SO4
B. Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
C. Having very low elastic limit resulting in permanent deformation from either mechanical or
thermal strain
D. All A., B. and C.

A. Freon
B. H2SO4 (95%) at room temperature
C. H2SO4 (fuming)
D. Wet SO2

A. 0.02
B. 0.2
C. 0.35
D. 0.5

A. Rupture strength and hot hardness
B. Impact strength and bonding strength
C. Deformation resistance
D. Wear resistance