Lakshya Education MCQs

Question: In arc welding, Argon is used because of its
Options:
A.Low reactivity with metal
B.Ability to lower the melting point of the metal
C.High flammability
D.High calorific value
Answer: Option A

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More Questions on This Topic :

Question 1. An inert gas mixed with oxygen given to patients suffering from restricted breathing is
  1.    Helium
  2.    Krypton
  3.    Radon
  4.    Argon
Answer: Option A
Question 2. Which of the following elements is obtained from seaweeds ?
  1.    Iodine
  2.    Vanadium
  3.    Argon
  4.    Sulphur
Answer: Option A
Question 3. Silica gel is a
  1.    Moisturizer
  2.    Flavouring agent
  3.    Drying agent
  4.    Delicious food
Answer: Option C
Question 4. In vulcanisation process, rubber can be hardened by adding
  1.    Nitrogen
  2.    Silicon
  3.    Sulphur
  4.    Alcohol
Answer: Option C
Question 5. The substance that is added to make natural rubber strong and more bouncy is
  1.    Polythene
  2.    Sponge
  3.    Sulphur
  4.    Chlorine
Answer: Option C
Question 6. Which one of the following statements is not correct? Vulcanisation of rubber makes it
  1.    Soft and flexible
  2.    Strong and hard
  3.    Chemical resistant
  4.    Withstand higher temperatures
Answer: Option A

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