Class IX

Cathode rays or cathode ray particles are
  1. protons
  2. muons
  3. electrons
  4. neutrons
An atom of an element contains 29 electrons and 35 neutrons. The number of protons are:
  1. 35
  2. 32
  3. 29
  4. 30
When an electric discharge is passed through gaseous hydrogen, the H2 molecules dissociate and the energetically excited hydrogen atoms produced emit electromagnetic radiation of discrete frequencies. The hydrogen spectrum consists of
  1. several lines named after their discoverers
  2. a continuous spectrum that reduces to zero at small wavelengths
  3. several series of lines named after their discoverers
  4. a continuous spectrum that reduces to zero at large wavelengths
Arrange the electrons present in the 4s, 3d, 4p and 3p orbitals in the order of their increasing energies
  1. (3d) < (3p) < (4p) < (4s)
  2. (3p) < (4s) < (3d) < (4p).
  3. (4s) < (4p) < (3p) < (3d)
  4. (4p) < (4s) < (3p) < (3d)
Quantum mechanics is a theoretical science that deals with the study of the
  1. motions of the microscopic objects that have only particle like properties
  2. motions of the microscopic objects that have both observable wave like and particle like properties
  3. motions of the macroscopic objects that have both observable wave like and particle like properties
  4. motions of the macroscopic objects that have only particle like properties
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