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ATOM AND NUCLEI MCQs

Total Questions : 20 | Page 2 of 2 pages
Question 11. An element with atomic mass number of 14 and atomic number 6 has how many neutrons?
  1.    6
  2.    8
  3.    14
  4.    20
 Discuss Question
Answer: Option B. -> 8
Question 12. When an alpha particle is emitted from an unstable nucleus, the atomic mass number of the nucleus
  1.    increases by 2.
  2.    decreases by 2.
  3.    increases by 4.
  4.    decreases by 4.
 Discuss Question
Answer: Option D. -> decreases by 4.
Question 13. Particles which can be added to the nucleus of an atom without changing its chemical properties are called
  1.    neutrons
  2.    electrons
  3.    protons
  4.    alpha particles
 Discuss Question
Answer: Option A. -> neutrons
Question 14. The mass of {90/38}Sr is 89
  1.    1.2 MeV
  2.    112 keV
  3.    0.546 MeV
  4.    1.8 MeV
 Discuss Question
Answer: Option C. -> 0.546 MeV
Question 15. A nuclei having same number of neutron but different number of protons / atomic number are called
  1.    isobars
  2.    isomers
  3.    isotones
  4.    isotopes
 Discuss Question
Answer: Option C. -> isotones
Question 16. The mass of an atomic nucleus is less than the sum of the masses of its constituents
  1.    heat energy
  2.    light energy
  3.    electrical energy
  4.    energy which binds nucleons together
 Discuss Question
Answer: Option D. -> energy which binds nucleons together
Question 17. Nucleus of an atom whose atomic mass is 24 consists of
  1.    11 electrons, 11 protons and 13 neutrons
  2.    11 electrons, 13 protons and 11 neutrons
  3.    11 protons and 13 neutrons
  4.    11 protons and 13 electrons
 Discuss Question
Answer: Option C. -> 11 protons and 13 neutrons
Question 18. The number of protons in an atom of atomic number Z and mass number A is
  1.    zero
  2.    Z
  3.    A – Z
  4.    A
 Discuss Question
Answer: Option B. -> Z
Question 19. The atomic mass unit is defined as
  1.    the mass of a proton
  2.    the mass of an electron.
  3.    the mass of a hydrogen-1 atom.
  4.    one twelfth the mass of a carbon-12 atom
 Discuss Question
Answer: Option D. -> one twelfth the mass of a carbon-12 atom
Question 20. The ground state energy of Hydrogen atom is -13
  1.    0 eV
  2.    -13.6 eV
  3.    2 eV
  4.    -27.2 eV
 Discuss Question
Answer: Option D. -> -27.2 eV

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