Lakshya Education MCQs

Question: Duralumin is an alloy of aluminium and copper. Percentage of copper in duralumin is
Answer: Option D

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Question 1. Stainless steel is welded using
  1.    Oxy-acetylene flame
  2.    Oxy-hydrogen flame
  3.    Arc welding
  4.    Inert gas arc welding
Answer: Option D
Question 2. Pick out the wrong statement about the machinability of metals. Machinability of a metal
  1.    Decreases with increase in strain hardening tendencies
  2.    Decreases with increase in hardness, in general
  3.    Depends on the composition, microstructure and physical & mechanical properties
  4.    Decreases with increases in tensile strength & decrease in grain size
Answer: Option D
Question 3. Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal
  1.    Tensile strength
  2.    Compressive strength
  3.    Young's modulus
  4.    Thermal co-efficient of expansion
Answer: Option D
Question 4. __________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in area & percentage elongation of a material.
  1.    Tensile
  2.    Fatigue
  3.    Impact
  4.    None of these
Answer: Option A
Question 5. High __________ of cast iron makes it suitable for use in machine beds.
  1.    Compressive strength
  2.    Endurance strength
  3.    Damping capacity
  4.    Tensile strength
Answer: Option A
Question 6. Improvement in mechanical properties of metals in its hot working is due to the grains
  1.    Recrystallisation
  2.    Refinement
  3.    Growth
  4.    Recovery
Answer: Option B

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