Lakshya Education MCQs

Question: Which of the following comprises of hydrocarbons?
Options:
A.Mica flakes
B.Glass
C.Rubber
D.None of these
Answer: Option C

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Question 1. Specify the material of construction suitable for handling concentrated HNO₃ at 100°C.
  1.    High silicon iron, Kel-F and teflon
  2.    Tin and wood
  3.    Silicone rubber
  4.    Stainless steel
Answer: Option A
Question 2. Which of the following is not an alloy of copper?
  1.    Muntz metal
  2.    Admirability gun metal
  3.    German silver
  4.    Pewter metal
Answer: Option D
Question 3. Softness of silver can be converted into hardness by alloying it with small quantity of
  1.    Copper & nickel
  2.    Zinc
  3.    Aluminium
  4.    Tin
Answer: Option A
Question 4. Diamagnetic materials are magnetised
  1.    Strongly
  2.    Only slightly
  3.    With eddy currents only
  4.    In a direction opposite to that of the applied field
Answer: Option D
Question 5. A hardened steel essentially contains
  1.    Sorbite
  2.    Troostite
  3.    Martensite
  4.    None of these
Answer: Option C
Question 6. Which of the following finds the least commercial use?
  1.    Pure iron
  2.    High silicon iron
  3.    Low carbon steel
  4.    High carbon steel
Answer: Option A

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