Which of the following is the most prone to atmospheric corrosion ?

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The chlorinator used in the manufacture of DDT is made of___________________?

A. Glass B. Glass lined steel C. Teflon D. Bakelite...

_____________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working?

A. Solid solution hardening B. Screw dislocation C. Strain ageing D. Twinning...

Which of the following is the hardest material ?

A. Topaz B. Quartz C. Corundum D. Fluorite...

Presence of even 0.005% of _____________ in copper makes it highly brittle, rendering it useless for wire-drawing?

A. Oxygen B. Arsenic C. Antimony D. Bismuth...

Molybdenum steels containing 0.15 to 0.40% molybdenum___________________?

A. Are prone to temper brittleness B. Are used for automobile parts like gears, axle, shaft, bearings etc. C. Have very poor fatigue resistance D. Do not contain nickel or chromium or both...