Class IX

Lowest energy orbital among following is
  1. 2s
  2. 2p
  3. 3s
  4. 3p
According to Rutherford, most of space occupied by atom is
  1. filled
  2. partially filled
  3. empty
  4. none of above
Energy of emitted light is equal to
  1. sum of energy levels
  2. difference between energies of orbits
  3. product of energies of orbits
  4. none of above
Iodine-123 is used to
  1. diagnose thyroid problem
  2. image the brain
  3. kill cancer cells
  4. trace the blood flow
Electron revolves around nucleus in orbits which have
  1. variable energy
  2. fixed energy
  3. infinite energy
  4. zero energy
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