Multiple Choice Questions

STRUCTURE OF THE ATOM

Updated for CBSE 2027
30+ Practice Questions
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Practice Questions with Answers

Total 30 questions available

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Q. 1
Which species does not contain neutron
A
H
B
Li+2
C
O
D
C
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Q. 2
Mass number of an element is
A
Number of neutrons and protons in the nucleus
B
Number of protons in its nucleus
C
Number of neutrons in the nucleus
D
Number of electrons and protons in the atom
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Q. 3
Which analogy is used to describe Thomson's model of the atom?
A
A basketball
B
A Christmas pudding
C
A chocolate cake
D
A fruit salad
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Q. 4
Why is the atom considered electrically neutral in Thomson's model?
A
Electrons are removed.
B
It contains only neutrons.
C
It has no charges.
D
Positive and negative charges balance each other.
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Q. 5
An atom with a mass number of 14 and 8 neutrons is
A
Isobar of oxygen
B
Isotope of oxygen
C
Isobar of carbon
D
Isotope of carbon
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Q. 6
Alpha-particles go straight through thin foil because
A
alpha-particles are positively charged.
B
alpha-particles are smaller than electrons.
C
alpha-particles move with low velocity.
D
most part of the atom is empty.
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Q. 7
What did Thomson discover in 1897?
A
Neutron
B
Electron
C
Nucleus
D
Proton
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Q. 8
What did Thomson’s discovery change about atomic theory?
A
Atoms were believed to be solid and indivisible.
B
Atoms were found to be made entirely of protons.
C
Atoms were shown to contain smaller particles.
D
Atoms had no structure.
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Q. 9
Number of electrons in Argon
A
16
B
17
C
19
D
18
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Q. 10
What is another name for Thomson's model of the atom?
A
Solar system model
B
Nuclear model
C
Plum pudding model
D
Rutherford model
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Q. 11
Atomic number of any element
A
Atomic weight divided by two
B
Nucleus weight
C
Nuclear charge
D
Electrical charge of nucleus
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Q. 12
Neutron is a fundamental particle which has
A
#ERROR!
B
No charge and 1 unit mass
C
Have no charge and mass
D
Have –1 unit charge and 1 unit mass
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Q. 13
Lightest particle is
A
Neutron
B
Electron
C
Proton
D
None of these
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Q. 14
What limitation did Thomson's model have?
A
It was too complex.
B
It lacked positive charges.
C
It could not explain later experimental results.
D
It did not explain electron behavior.
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Q. 15
What model did J.J. Thomson propose for the atom?
A
Plum pudding model
B
Quantum model
C
Nuclear model
D
Solar system model
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Q. 16
Nucleus consists of
A
Proton and electron
B
Neutron and electron
C
Only neutron
D
Proton and neutron
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Q. 17
What did J.J. Thomson receive in recognition of his work?
A
Medal of Honor
B
Presidential Medal of Freedom
C
Fields Medal
D
Nobel Prize in Physics
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Q. 18
What was the main idea behind the "plum pudding model"?
A
Atoms are just empty space.
B
Electrons are embedded in a positive sphere.
C
Atoms have a solid core.
D
Atoms are indivisible.
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Q. 19
The number of valence electrons in Na is
A
4
B
1
C
3
D
2
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Q. 20
Fundamental particle of atomic nucleus is
A
p, e-
B
p, n, e
C
p, n
D
n, e
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Q. 21
Maximum number of electrons in the third shell (n = 3)
A
18
B
8
C
10
D
2
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Q. 22
Isotopes of an element are atoms which have
A
Same number of protons
B
Same number of neutrons
C
Same mass number
D
Different number of electrons
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Q. 23
In an atom, the mass number is equal to the number of
A
Electrons
B
Protons
C
Nucleons
D
Neutrons
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Q. 24
Rutherford’s scattering experiment conclusions exclude
A
Scattering follows Coulomb’s law.
B
Radius of nucleus is less than 10^-14 m.
C
Positively charged particles move with high velocity.
D
Alpha-particles can come within 10^-14 m of nucleus.
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Q. 25
The isotope deuterium of hydrogen has
A
One electron and two neutrons
B
One proton and one neutron
C
One neutron and two protons
D
No neutrons and one proton
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Q. 26
The charge/mass ratio of the electron______
A
depends upon nature of gas.
B
depends upon nature of electrodes.
C
remains constant.
D
depends upon both nature of gas and nature of electrodes.
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Q. 27
In Thomson’s model, what represents the positive charge?
A
Neutrons
B
Electrons
C
Positive sphere
D
Proton
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Q. 28
The ion of an atom has 2 negative charges, mass number is 16, neutrons are 8.
A
6
B
7
C
8
D
10
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Q. 29
Number of electrons in the valence shells of Sodium and Calcium
A
2, 1
B
1, 1
C
2, 2
D
1, 2
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Q. 30
Analogy Thomson used for his model of the atom
A
A sandwich
B
A Christmas pudding
C
A balloon
D
A fruit salad
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