Structure of Atom Class 9 MCQ Test. We covered all the Structure of Atom Class 9 MCQ Test in this post for free so that you can practice well for the exam.
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MCQ on Structure of Atom for Students
Bohr,s theory is valid for
1) All atoms
2) All ions
3) Any atom or ion having single electron
4) All molecules
Option 3 – Any atom or ion having single electron
The sub-shells present in L- shell are
1) s and d
2) s and p
3) s,p and d
4) s,p,d and f
Option 2 – s and p
Rutherford suggested that atoms are
1) spherical
2) cylindrical
3) tetrahedral
4) pyramidal
Option 1 – spherical
Bohr’s model could not account for
1) Seebeck effect
2) Raman’s effect
3) Condensation effect
4) Zeeman effect
Option 4 – Zeeman effect
The region in space where there is a finite probability of finding electron is
1) Atomic number
2) Atomic orbital
3) Atomic particle
4) Ground state
Option 2 – Atomic orbital
Gold foil was used in Rutherford’s scattering experiment because it
1) has high refractive index
2) has high density
3) is highly malleable
4) is high ductile
Option 3 – is highly malleable
According to Bohr Burry the maximum number of electrons that can be accommodated in each atomic orbital is
1) 8
2) 2
3) 10
4) 6
Option 2 – 2
Atomic number of A is 10 and element B is 11. Which statement about A and B is correct
1) Both are chemically inert
2) B is chemically inert
3) B is more reactive than A
4) A is more reactive than B
Option 3 – B is more reactive than A
Isotopes are
1) atoms of same element
2) atoms of different elements
3) molecules of same element
4) radicals of the same element
Option 1 – atoms of same element
Isobars have
1) same no. of protons and different electron
2) different number of protons and neutrons
3) same no. of electrons and neutrons
4) same no. of neutrons
Option 2 – different number of protons and neutrons
The orbits of an atom are also called energy levels because these are spheres containing definite energy.
1) assertion is correct and reason is correct
2) assertion is correct but reason is wrong
3) assertion is wrong but reason is correct
4) assertion is wrong and reason is wrong
Option 2 – assertion is correct but reason is wrong
The size of an atom is decided by
2) no. of protons
3) no. of protons and neutrons
4) no. of electrons
Option 4 – no. of electrons
Calcium has 20 electrons. These occupy K,L,M, and N shells. Which shell or shells are incomplete
1) L,M,N shells
2) M,N shells
3) N shells
4) K,L,M,N shells
Option 2 – M,N shells
There is no difference between valency and valence electrons except in case of
1) elements of group 2
2) elements of group 3
3) elements of group 4
4) elements of group 5
Option 4 – elements of group 5
Which of the following statements is wrong for the model of an atom as proposed by Rutherford
1) The atom consists of a positively charged centre called nucleus
2) Nucleus consists of protons and neutrons
3) Most of the mass is concentrated in the nucleus
4) The volume of nucleus is very small as compared to the total volume of the atom
Option 2 – Nucleus consists of protons and neutrons
Rutherford alpha- particle scattering experiment was responsible for the discovery of
1) Nucleus
2) neutron
3) mass number
4) atomic number
Option 1 – Nucleus
Mass number of an element can be obtained by adding
1) Number of electrons and neutrons
2) number of protons and neutrons
3) number if electrons and protons
4) number of electrons, protons and neutrons
Option 2 – number of protons and neutrons
If a neutral atom has three shells completely filled up, then the number electrons of the atom is
1) 28
2) 32
3) 30
4) 18
Option 3 – 30
Which one is not true for two isotopes?
1) Similar mass number
2) Similar atomic number
3) Similar chemical properties
4) Similar electronic configurations
Option 1 – Similar mass number
Calcium, Magnesium, Sulphur and Chlorine have atomic numbers 20, 12, 16, 17 respectively. Which of these does not show a valency of 2?
1) Calcium
2) Magnesium
3) Sulphur
4) Chlorine
Option 4 – Chlorine
The number of isotopes that are exhisted for both xenon and cesium are
1) 46
2) 16
3) 26
4) 36
Option 4 – 36
The isotope of iodine is used in the treatment of
1) cancer
2) goitre
3) age of fossil
4) fuel in nuclear react
Option 2 – goitre
Among the following which elements can show multiple valencies
1) sulphur
2) phosphorus
3) sodium
4) both a, b
Option 4 – both a, b
Isotopes have different physical properties due to
1) same number of protons
2) same number of electrons
3) same number of neutrons
4) Different number of neutrons or different mass numbers
Option 4 – Different number of neutrons or different mass numbers
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