Class XI

If speed of rotation of the earth increases, weight of the body
  1. . increases
  2. . remains unchanged
  3. decreases
  4. may decrease or increase
In which of the following pairs, the two substances forming the pair are chemically most dissimilar?
  1. Sugar and paper
  2. Butter and paraffin wax
  3. Chalk and marble
  4. Charcoal and diamond
How many red blood cells does the bone marrow produce every second?
  1. 2 million
  2. 5 million
  3. . 7 million
  4. . 10 million
India played its first cricket Test Match in
  1. 1922
  2. 1932
  3. . 1942
  4. 1952
How much of blood does the normal human heart on each of its contraction pump into the arteries?
  1. 30 cm3
  2. 60 cm3
  3. 30 cm5
  4. 60 cm5
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