Lakshya Education MCQs

Question: Which of the following is used as filler in tyre of rubber ?
A.Carbon black
Answer: Option A

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Question 1. The open "Sigrees" or coal stoves often require fanning to sustain burning because of
  1.    Tendency of carbon dioxide to form a layer along with dust smoke
  2.    Lack of oxygen in the surroundings of sigrees
  3.    Accumulation of smoke and dust over the sigrees
  4.    Interrupted release of moisture from the material
Answer: Option A
Question 2. 1 carat of diamond is equal to
  1.    200 mg
  2.    200 g
  3.    100 mg
  4.    100 g
Answer: Option A
Question 3. 24 carat of diamond is equal to
  1.    200 mg
  2.    200 g
  3.    95% mg
  4.    91% gold
Answer: Option A
Question 4. When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is
  1.    Hydrogen
  2.    Oxygen
  3.    Carbon dioxide
  4.    All of them
Answer: Option C
Question 5. In which of the following substances all carbon atoms are quaternary in nature ?
  1.    Graphite
  2.    Diamond
  3.    Teflon
  4.    Napthalene
Answer: Option B
Question 6. One property of ammonia is
  1.    It is insoluble in water
  2.    It is a odourless gas
  3.    It is a yellowish gas
  4.    Its aqueous solution turns red litmus blue
Answer: Option D

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