CBSE Questions for Class 9 Chemistry Structure Of The Atom Quiz 6 - MCQExams.com

State True or False.
Solutions of Schrodinger equation for $$H$$-atom give the same set of values of the energy levels as does the Bohr's theory.
  • True
  • False
The Interaction energy between an electron and proton is very small when they are far apart.
  • True
  • False
The number of electrons in a neutral atom is equal to:
  • atomic mass number
  • number of neutrons
  • its valency
  • number of protons
What is the difference in number of neutrons in Protium and Deuterium?
  • 1
  • 2
  • 3
  • 4
According to whose atomic model, electrons are embedded in a gel of positive charge?
  • Dalton's model
  • Bohr's model
  • Thomson's model
  • Rutherford's model
All atoms contain neutrons in their nuclei except:
  • Protium
  • Helium
  • Neon
  • Chlorine
Determine the number of electron in the isotope of 'H' (mass no. 2).
  • 1
  • 2
  • 0
  • 3
What are imaginary paths around the nucleus in which electrons revolve?
  • Spaces
  • Orbits
  • Any arbitrary path
  • All of the above
Match the atomic numbers 4, 14, 8, 15, and 19 with a non-metal of valency 4.
  • 4
  • 8
  • 14
  • 15
State whether the statement is true or false:

Isotopes are the atoms of the different element.
  • True
  • False
How many nucleons are present in phosphorous?
  • $$15$$
  • 16
  • $$30$$
  • $$31$$
State whether true or false :

A neutron can be found in all atoms.
  • True
  • False
Rutherford's $$\alpha$$-scattering experiment led to the following conclusion(s):
  • atom has largely completely filled space.
  • the centre of the atom has negatively charged nucleus.
  • the size of the nucleus is very small as compared to the size of the atom.
  • electrons revolve around the proton.
The heaviest subatomic particle is:
  • neutron
  • positron
  • electron
  • proton
Which of the following gave the idea of nucleus of the atom?
  • Oil drop experiment
  • Davisson and Germer's experiment
  • $$\alpha$$-ray scattering experiment
  • Austen's mass spectrogram experiment
The ratio of the radii of the atom to the nucleus is :
  • $$10^5\, :\, 1$$
  • $$10^{-4}\, :\, 1$$
  • $$10^{2}\, :\, 1$$
  • $$10^4\, :\, 1$$
State True or False.
Electron was discovered by Goldstein.
  • True
  • False
The approximate radius of polonium nucleus of mass number 210 is:
  • $$7.72 \times 10^{-15}\ m$$
  • $$7.72 \times 10^{-14}\ m$$
  • $$4\times 10^{-9}\ m$$
  • $$4\times 10^{-12}\ m$$
Bohr's atomic model can explain the spectrum of:
  • hydrogen atoms only
  • atoms or ions which are unielectron
  • atoms or ions which have only two electrons
  • hydrogen molecule
The particles present in the nucleus of an atom are :
  • the proton and the electron
  • the electron and the neutron
  • the proton and the neutron
  • Only neutrons
A neutron is:
  • neutral
  • negatively charged
  • positively charged
  • None of these
The nucleus of an atom contains
  • Electrons and protons
  • Protons and neutrons
  • Electrons and neutrons
  • Electrons, protons and neutrons
Which statement about atom is incorrect?
  • Atoms are invisible
  • All atoms have same number of protons and electrons
  • Atoms are made up of subatomic particles
  • It has mass
____________ is an obsolete scientific model of the atom proposed by J. J. Thomson in $$1904$$.
  • Musk melon model
  • Plum pudding model
  • Christmas melon model
  • Pudding model
Most of the mass of an atom is concentrated in a small region of space called the ..............
  • nucleus
  • neutron
  • proton
  • electron
Atomic number (Z) = Number of ......... = Number of ..............(for neutral atom)
  • protons, electrons
  • electrons, neutrons
  • protons, neutrons
  • nucleus, protons
Almost all of the mass of an atom is concentrated at the
  • nucleus
  • neutron
  • proton
  • electron
............... of an element are the atoms of same element having same atomic number but different mass number.
  • Isotope
  • Isobar
  • Isotone
  • Isoelectron
In Rutherford's scattering experiment which of the following does not happen ?
  • Most of the $$\displaystyle \alpha $$-rays pass through without deflection
  • A few $$\displaystyle \alpha $$-particles pass through the nucleus
  • A few $$\displaystyle \alpha $$-particles are deflected back
  • $$\displaystyle \alpha $$-particles going near the nucleus are slightly deflected
An atom is:
  • positively charged
  • negatively charged
  • electrically neutral
  • None of these
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