CBSE Questions for Class 9 Chemistry Structure Of The Atom Quiz 5 - MCQExams.com

Neutrons are present in all atoms except?
  • He
  • C
  • H
  • Ne
State whether the given statement is true or false:

Atomic mass of an element is same as the mass of a single atom of that element.
  • True
  • False
Most of the alpha particles go straight through the foil if it is passed through a thin metal foil. This is due to the reason that:
  • alpha particles are much heavier than electrons
  • alpha particles are positively charged
  • most part of the atom is empty
  • alpha particles move with the high velocity
Electrons present in the outermost orbit are called:
  • valence electrons
  • independent electrons
  • autonomous electrons
  • none of these
An electron in hydrogen atom is excited to 'N' shell. What are the possible transitions it can undergo? Compare the energies of transitions.
  • 3 transitions, energies goes on decreasing
  • 2 transitions, energies goes on decreasing
  • 3 transitions, energies goes on increasing
  • 2 transitions, energies goes on increasing
Neutron has a _______charge.
  • +ve
  • -ve
  • Zero
  • None of these
The conclusions of Rutherford's scattering experiment are:
  • nucleus is very small in size
  • nucleus is very heavy and carries positive charge
  • most of the space in the atom is empty
  • all of the above
Rutherford's scattering experiment is related to the size of the:
  • nucleus
  • atom
  • electron
  • neutron
Atomic mass number is sum of number of:
  • protons and electrons
  • protons and neutrons
  • neutrons and electrons
  • None of the above
Rutherford's model explains :
  • Atom is a planetary model.
  • Electrons never loose nor gain energy.
  • Electron revolves around the nucleus with high velocities to counterbalance the forces of electrostatic forces of attraction between protons and electrons.
  • Electrons do not move at all.
According to Bohr's atomic model, electrons revolve around the nucleus in stationary orbits.
  • True
  • False
Neutron does get deflected in the presence of electric field.
  • True
  • False
Rutherford experiment of scattering of $$\alpha$$ particles showed for the first time that the atom has:
  • electrons
  • only protons
  • nucleus
  • None of the above
The electrons revolve around the nucleus only in certain fixed paths called:
  • orbits
  • orbitals
  • center
  • layer
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  • Assertion is correct but Reason is incorrect.
  • Assertion is incorrect but Reason is correct.
Rutherford's atomic model told that the whole concentration of an atom is located at the:
  • centre of atom
  • outside of atom
  • distributed throughout the atom
  • middle layer of atom
State whether the statement is true or false:
In Rutherford experiment, some $$\alpha$$- rays get diverted because of the attraction of electrons.
  • True
  • False
Identify the sub-atomic particle(s) with no charge and relative mass equal to one among the following:
  • Proton
  • Electron
  • Neutron
  • All
Elements X, Y, and Z have atomic numbers 6, 9, and 12 respectively. Which one has four electrons in its valence shell?
  • X
  • Y
  • Z
  • Both A and B
Rutherford's alpha particle scattering experiment eventually led to the conclusion that:
  • mass and energy are related
  • electrons occupy space around the nucleus
  • neutrons are buried deep in the nucleus
  • the point of impact with matter can be precisely determined
A small positively charged nucleus is present in the center. Which observations tells about this?
  • Most of the $$\alpha \ -$$ particles passed straight
  • Most of the $$\alpha \ -$$ particles rebounded after hitting the atoms
  • Only a few $$\alpha \ -$$ particles deflected away from their path
  • Very few $$\alpha \ -$$ particles rebounded
Rutherford's alpha-particle scattering experiment showed for the first time that an atom has:
  • electrons
  • protons
  • a nucleus
  • neutrons
Which of the following path is assumed for the electron in the theory of Rutherford?
  • Elliptical
  • Circular
  • Spiral
  • All of the above
The atomic nucleus contains:
  • protons
  • neutrons
  • electrons
  • None of the above
When fast moving alpha particles are made to fall on a thin gold foil, most of them go straight through the foil because:
  • alpha particles are much heavier than electrons
  • alpha particles are positively charged
  • most part of the atom is empty space
  • alpha particles move with high velocity
Isotopes has different:
  • physical properties
  • chemical properties
  • atomic number
  • mass number
J.J.Thomson for the first time identified an electron as a particle and his son G.P.Thomson first time identified an electron as a wave and both were awarded Nobel prizes in different years. 
  • True
  • False
Rutherford experiment of scattering of $$\alpha$$-particles showed for the first time that the atom has :
  • protons
  • nucleus
  • electrons
  • neutrons
State True or False.

The nucleus always contains a proton.
  • True
  • False
When $$\alpha$$-particle are sent through a thin metal foil, most of them go straight through the foil because:
  • $$\alpha$$-particles are much heavier than electrons
  • $$\alpha$$-particles are positively charged
  • most part of the atom is empty space
  • $$\alpha$$-particle move with high velocity
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