πŸ“Š Materials And Construction
Q. Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.
  • (A) 0.02
  • (B) 0.2
  • (C) 0.35
  • (D) 0.5
πŸ’¬ Discuss
βœ… Correct Answer: (B) 0.2
πŸ“Š Materials And Construction
Q. __________ iron is produced, when molten pig iron is allowed to cool gradually.
  • (A) White cast
  • (B) Grey cast
  • (C) Wrought
  • (D) None of these
πŸ’¬ Discuss
βœ… Correct Answer: (B) Grey cast
πŸ“Š Materials And Construction
Q. 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
πŸ’¬ Discuss
βœ… Correct Answer: (D) Bismuth
πŸ“Š Materials And Construction
Q. Maximum consumption of lead is in the manufacture of
  • (A) Storage batteries
  • (B) Solder alloys
  • (C) Electric cable sheathing
  • (D) Lead lined vessels
πŸ’¬ Discuss
βœ… Correct Answer: (A) Storage batteries
πŸ“Š Materials And Construction
Q. Babbit metal (used for making bearings) comprises of
  • (A) Saw dust and iron dust mixture
  • (B) Mainly tin (85%) and lead
  • (C) Copper and aluminium
  • (D) Zinc and aluminium
πŸ’¬ Discuss
βœ… Correct Answer: (B) Mainly tin (85%) and lead
πŸ“Š Materials And Construction
Q. Common house hold glass (i.e., soda-lime glass) is a/an __________ material.
  • (A) Fully crystalline
  • (B) Partly crystalline
  • (C) Amorphous
  • (D) None of these
πŸ’¬ Discuss
βœ… Correct Answer: (B) Partly crystalline

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