Atomic Structure
Multiple Choice Questions
1. In an atom, electrons:
1) Move around the nucleus in circular orbits.
2) Move around the nucleus in elliptical orbits
3) From diffused cloud around the nucleus
4) None of these
2. Mass of the neutron is:
1) Same as proton 2) Much less than that of proton
3) Slightly less than that of proton 4) Slightly more than that of proton
3. Positive charge in an atom is:
1) Concentrated in the nucleus 2) Scattered all over the atom
3) Revolve around the nucleus 4) None of these
4. Nuclear model of the atom was proposed by:
1) Neil Bohr 2) Rutherford
4) Thomson 4) Moseley
5. Neutron was discovered by:
1) Thomson 2) Chadwick
3) Bohr 4) Rutherford
6. Mass number of an element represents sum of number of:
1) Protons and Neutrons 2) Protons and electrons
3) Electrons and neutrons 4) None of these
7. Atomic number of atoms represents:
1) Protons and Neutrons 2) Protons only
3) Protons or electrons in a neutral atom 4) Electrons and neutrons
8. According to Dalton's atomic theory, an atom:
1) Can be further divided 2) Cannot be subdivided
3) Contains neutrons, protons and electrons 4) None of the above
9. Rutherford was awarded Nobel Prize in 1908 for his studies on:
, 1) Radicals 2) Nuclear model of atoms
3) Radioactive matter 4) Discovery of neutron
10. Cathode rays consists of a stream of:
1) Protons 2) Neutrons
3) Electrons 4) Positrons
11. Beta rays consists of a stream of:
1) Protons 2) Neutrons
3) Electrons 4) Positrons
12. Cathode rays are deflected by:
1) A magnetic field only 2) An electric field only
3) Both electric and magnetic field 4) Neither electric nor magnetic
13. The nature of anode rays depends on:
1) Nature of discharge tube 2) Nature of residual gas
3) All of these 4) None of the above
14. Rutherford's experiments on scattering of particles showed for the first time that atom has:
1) Electrons 2) Positrons
3) Neutrons 4) Nucleus
15. Line spectra are characteristic of:
1) Atoms 2) Molecules
3) Ions 4) Radicals
16. In the discharge tube emission of cathode rays requires:
1) Low potential and low pressure 2) Low potential and high pressure
3) High potential and high pressure 4) High potential and low pressure
17. 18. When alpha - particles are sent through a thin metal foil, most of them go straight through the
foil because:
1) alpha particles are much heavier then electrons 2) alpha particles are positively charged
3) Most part of atom has empty space 4) alpha particles have high velocity
18. The number of electrons in an atom of an element is equal to its:
1) Atomic weight 2) Atomic number
3) Equivalent weight 4) Mass number
Multiple Choice Questions
1. In an atom, electrons:
1) Move around the nucleus in circular orbits.
2) Move around the nucleus in elliptical orbits
3) From diffused cloud around the nucleus
4) None of these
2. Mass of the neutron is:
1) Same as proton 2) Much less than that of proton
3) Slightly less than that of proton 4) Slightly more than that of proton
3. Positive charge in an atom is:
1) Concentrated in the nucleus 2) Scattered all over the atom
3) Revolve around the nucleus 4) None of these
4. Nuclear model of the atom was proposed by:
1) Neil Bohr 2) Rutherford
4) Thomson 4) Moseley
5. Neutron was discovered by:
1) Thomson 2) Chadwick
3) Bohr 4) Rutherford
6. Mass number of an element represents sum of number of:
1) Protons and Neutrons 2) Protons and electrons
3) Electrons and neutrons 4) None of these
7. Atomic number of atoms represents:
1) Protons and Neutrons 2) Protons only
3) Protons or electrons in a neutral atom 4) Electrons and neutrons
8. According to Dalton's atomic theory, an atom:
1) Can be further divided 2) Cannot be subdivided
3) Contains neutrons, protons and electrons 4) None of the above
9. Rutherford was awarded Nobel Prize in 1908 for his studies on:
, 1) Radicals 2) Nuclear model of atoms
3) Radioactive matter 4) Discovery of neutron
10. Cathode rays consists of a stream of:
1) Protons 2) Neutrons
3) Electrons 4) Positrons
11. Beta rays consists of a stream of:
1) Protons 2) Neutrons
3) Electrons 4) Positrons
12. Cathode rays are deflected by:
1) A magnetic field only 2) An electric field only
3) Both electric and magnetic field 4) Neither electric nor magnetic
13. The nature of anode rays depends on:
1) Nature of discharge tube 2) Nature of residual gas
3) All of these 4) None of the above
14. Rutherford's experiments on scattering of particles showed for the first time that atom has:
1) Electrons 2) Positrons
3) Neutrons 4) Nucleus
15. Line spectra are characteristic of:
1) Atoms 2) Molecules
3) Ions 4) Radicals
16. In the discharge tube emission of cathode rays requires:
1) Low potential and low pressure 2) Low potential and high pressure
3) High potential and high pressure 4) High potential and low pressure
17. 18. When alpha - particles are sent through a thin metal foil, most of them go straight through the
foil because:
1) alpha particles are much heavier then electrons 2) alpha particles are positively charged
3) Most part of atom has empty space 4) alpha particles have high velocity
18. The number of electrons in an atom of an element is equal to its:
1) Atomic weight 2) Atomic number
3) Equivalent weight 4) Mass number
