Class XI

All Conservation laws of nature are very useful in practice because
  1. It is applicable in all domains to solve problems using these laws
  2. it is more acceptable to solve problems using these laws
  3. it is more modern to solve problems using these laws
  4. it is often simpler to solve problems using these laws than using Newton’s laws
Which of the following is used as a lubricant?
  1. Graphite
  2. Silica
  3. Iron Oxide
  4. Diamond
Washing soda is the common name for
  1. Sodium carbonate
  2. Calcium bicarbonate
  3. Sodium bicarbonate
  4. Calcium carbonate
The most important ore of aluminium is
  1. bauxite
  2. haematite
  3. magnetite
  4. monazite
Carbon, diamond and graphite are together called
  1. allotropes
  2. isomers
  3. isomorphs
  4. isotopes
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