Class XI

Mesons are found in
  1. . Laser beam
  2. X-rays
  3. Gamma rays
  4. Cosmic rays
Which of the following metals remain in liquid for under normal conditions?
  1. Radium
  2. Zinc
  3. . Uranium
  4. . Mercury
Isotopes are separated by
  1. crystallisation
  2. sublimation
  3. . distillation
  4. filtration
The main constituents of pearls are
  1. calcium oxide and ammonium chloride
  2. . calcium carbonate and magnesium carbonate
  3. . aragonite and conchiolin
  4. ammonium sulphate and sodium carbonate
Bell metal is an alloy of
  1. nickel and copper
  2. zinc and copper
  3. brass and nickel
  4. tin and copper
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