Multiple Choice Questions
STRUCTURE OF THE ATOM
Practice Questions with Answers
Total 30 questions available
Q. 1
Which species does not contain neutron
A
HB
Li+2C
OD
CClick an option to check your answer
Q. 2
Mass number of an element is
A
Number of neutrons and protons in the nucleusB
Number of protons in its nucleusC
Number of neutrons in the nucleusD
Number of electrons and protons in the atomClick an option to check your answer
Q. 3
Which analogy is used to describe Thomson's model of the atom?
A
A basketballB
A Christmas puddingC
A chocolate cakeD
A fruit saladClick an option to check your answer
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.Click an option to check your answer
Q. 5
An atom with a mass number of 14 and 8 neutrons is
A
Isobar of oxygenB
Isotope of oxygenC
Isobar of carbonD
Isotope of carbonClick an option to check your answer
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.Click an option to check your answer
Q. 7
What did Thomson discover in 1897?
A
NeutronB
ElectronC
NucleusD
ProtonClick an option to check your answer
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.Click an option to check your answer
Q. 9
Number of electrons in Argon
A
16B
17C
19D
18Click an option to check your answer
Q. 10
What is another name for Thomson's model of the atom?
A
Solar system modelB
Nuclear modelC
Plum pudding modelD
Rutherford modelClick an option to check your answer
Q. 11
Atomic number of any element
A
Atomic weight divided by twoB
Nucleus weightC
Nuclear chargeD
Electrical charge of nucleusClick an option to check your answer
Q. 12
Neutron is a fundamental particle which has
A
#ERROR!B
No charge and 1 unit massC
Have no charge and massD
Have –1 unit charge and 1 unit massClick an option to check your answer
Q. 13
Lightest particle is
A
NeutronB
ElectronC
ProtonD
None of theseClick an option to check your answer
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.Click an option to check your answer
Q. 15
What model did J.J. Thomson propose for the atom?
A
Plum pudding modelB
Quantum modelC
Nuclear modelD
Solar system modelClick an option to check your answer
Q. 16
Nucleus consists of
A
Proton and electronB
Neutron and electronC
Only neutronD
Proton and neutronClick an option to check your answer
Q. 17
What did J.J. Thomson receive in recognition of his work?
A
Medal of HonorB
Presidential Medal of FreedomC
Fields MedalD
Nobel Prize in PhysicsClick an option to check your answer
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.Click an option to check your answer
Q. 19
The number of valence electrons in Na is
A
4B
1C
3D
2Click an option to check your answer
Q. 20
Fundamental particle of atomic nucleus is
A
p, e-B
p, n, eC
p, nD
n, eClick an option to check your answer
Q. 21
Maximum number of electrons in the third shell (n = 3)
A
18B
8C
10D
2Click an option to check your answer
Q. 22
Isotopes of an element are atoms which have
A
Same number of protonsB
Same number of neutronsC
Same mass numberD
Different number of electronsClick an option to check your answer
Q. 23
In an atom, the mass number is equal to the number of
A
ElectronsB
ProtonsC
NucleonsD
NeutronsClick an option to check your answer
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.Click an option to check your answer
Q. 25
The isotope deuterium of hydrogen has
A
One electron and two neutronsB
One proton and one neutronC
One neutron and two protonsD
No neutrons and one protonClick an option to check your answer
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.Click an option to check your answer
Q. 27
In Thomson’s model, what represents the positive charge?
A
NeutronsB
ElectronsC
Positive sphereD
ProtonClick an option to check your answer
Q. 28
The ion of an atom has 2 negative charges, mass number is 16, neutrons are 8.
A
6B
7C
8D
10Click an option to check your answer
Q. 29
Number of electrons in the valence shells of Sodium and Calcium
A
2, 1B
1, 1C
2, 2D
1, 2Click an option to check your answer
Q. 30
Analogy Thomson used for his model of the atom
A
A sandwichB
A Christmas puddingC
A balloonD
A fruit saladClick an option to check your answer
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