CBSE Questions for Class 9 Chemistry Structure Of The Atom Quiz 15 - MCQExams.com

The number that represents, how many times one atom of an element is heavier than mass of one atom of carbon $$ ^{12}_6C $$ is called :
  • Atomic number
  • Atomic weight
  • Relative atomic mass
  • All of these
The fundamental particles present in the nucleus of an atom are:
  • Alpha particle and electrons
  • Neutrons and protons
  • Neutrons and electrons
  • Electrons, neutrons and protons
The $$\alpha -particle$$ scattering experiment of Rutherford concluded that
  • The nucleus is made up of protons and neutrons
  • The number of electrons is exactly equal to number of protons in atom
  • The positive charge of the atom is concentrated in a very small space
  • Electrons occupy discrete energy levels
Which is correct statement about proton?
  • Proton is nucleus of deuterium.
  • Proton is ionized oxygen molecule.
  • Proton is ionized hydrogen atom.
  • None of these
The size of nucleus is of the order of :
  • $${10^{ - 12}}\;{\text{m}}$$
  • $${10^{ - 8}}\;{\text{m}}$$
  • $${10^{ - 15}}\;{\text{m}}$$
  • $${10^{ - 10}}\;{\text{m}}$$
The time period of revolving in the third orbit of $$Li^{2+}$$ ion is $$x$$ second. The time period of revolution in the second orbit of $$He^+$$ ion should be
  • $$x\ s$$
  • $$\dfrac {3}{2}x\ s$$
  • $$\dfrac {2}{3}x\ s$$
  • $$\dfrac {8}{27}x\ s$$
Which of following is not a conclusion of Rutherford's atomic model?
  • Most of the part inside an atom is empty.
  • Almost all mass of an atom is concentrated in the nucleus.
  • The size of nucleus is very small in comparison to the size fo atom.
  • Electron revolves round the nucleus in definite orbits.
In the Bohr's model of the hydrogen atom, let r, v and E represent the orbit radius, speed of the electron, respectively. Which of the following relation is proportional to the orbit number $$n$$? 
  • $$v\cdot r$$
  • $$r/E$$
  • $$r/V$$
  • $$r\cdot E$$
Which of the following contains same number of carbon atoms are in 6g of carbon? 
  • 8g ethane
  • 8g methane
  • 21g propane
  • 28g CO
Which of the following is discrete in Bohr's theory ?
  • Potential energy
  • Kinetic energy
  • Velocity
  • Angular momentum
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