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Online Tests
ECAT Pre General Science Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers
Question # 1
For Protium, the mass defect is:
Choose an answer
Infinite
Zero
Very large
A few grams
None of these
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Question # 2
Neutron was disvovered by:
Choose an answer
Rutherford in 1920
Chadwick in 1922
Bohr in 1913
Compton in 1927
None of these
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Question # 3
The energy acquired by a mass of 1g moving with the speed of light is
Choose an answer
3 x 10
8
J
9 x 10
13
J
3 x 10
13
J
9 x 10
16
J
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Question # 4
If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
Choose an answer
Equal to 1
Less than 1
Greater than 1
Infinity
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Question # 5
The number of protons inside a nucleus is called
Choose an answer
mass number
atomic weight
atomic number
none of these
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Question # 6
If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
Choose an answer
-4
4
2
1
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Question # 7
Neutrons are
Choose an answer
positive charge
negatively charged
massless
neutral
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Question # 8
Mass of neutron is
Choose an answer
1.67 x 10
-31
kg
1.67 x 10
-27
kg
9.1 x 10
-31
kg
1.67 x 10
-
19kg
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Question # 9
According to Rutherford atomic model, the positive charge in an atom
Choose an answer
is concentrated at its centre
is in the form of positive electron at same distance from its centre
is spread uniformly through its volume
none of these
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Question # 10
The half life of uranium-238 is
Choose an answer
6.2 x 10
9
years
4.5 x 10
9
days
4.5 x 10
9
years
1.3 x 10
6
years
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Question # 11
When certain nucleus emits anα particle, its mass number:
Choose an answer
Increases by one
Decreases by one
Remain same
Decreases by four
None of these
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Question # 12
In his experiment on nuclear reactions, Rutherford bombardedα particles on:
Choose an answer
Nitrogen
Hydrogen
Lead
Oxygen
Krypton
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Question # 13
The range of
β-particle in air is greater than that of
α-particle by
Choose an answer
1000 times
100 times
15 times
10 times
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Question # 14
The nucleus/nuclei of hydrogen is/are:
Choose an answer
Proton
Deuteron
Triton
All of these
None of these
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Question # 15
The number if neutrons in the nucleus of
92
U
235
are
Choose an answer
Infinite
92
235
143
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Question # 16
In radio-active decay, the original element which disintegrate to another element is called
Choose an answer
element
daughter element
parent element
none of these
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Question # 17
In 1932 Chadwick discovered
Choose an answer
proton
neutron
photon
electron
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Question # 18
Neutron was suggested to be in the nucleus by:
Choose an answer
Rutherford in 1920
Bohar in 1913
Dirac in 1928
Anderson in 1932
None of these
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Question # 19
The number of isotopes of hydrogen are
Choose an answer
2
1
3
4
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Question # 20
The isotope/s of hydrogen is /are:
Choose an answer
Protium
Deuterium
Tritium
Both (A) and (B)
All of these
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Question # 21
A mass spectrograph sort out
Choose an answer
molecules
atoms
elements
isotopes
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Question # 22
When certain nucleus emits aβ-particles, is mass number:
Choose an answer
Remain same
Increases by one
Decreases by one
Decreases by four
None of these
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Question # 23
The nucleus left after the emission of some radiation is called:
Choose an answer
Parent nucleus
Daughter necleus
Mother necleus
Any of these
None of these
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Question # 24
There is present in paraffin a large amount of:
Choose an answer
Nitrogen
Hydrogen
Carbon
Baryllium
Lithium
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Question # 25
Rutherford performed an experiment on nuclear reactions in:
Choose an answer
1718 A.D
1818 A.D
1918 A.D
2001 A.D.
1701 A.D.
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Question # 26
Nuclei that have the same charge number but different mass number are called
Choose an answer
isotones
isomers
isotopes
isobars
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Question # 27
Proton was discovered by Rutherford in
Choose an answer
1915
1906
1910
1920
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Question # 28
The figure 1.007276μ shows the mass of an:
Choose an answer
Atom
Positron
Electron
Neutron
Proton
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Question # 29
The chemical behaviour of an atom is determined by
Choose an answer
binding energy
atomic number
mass number
number of isotopes
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Question # 30
A mass difference of 0.0012 u is equivalent to and energy of:
Choose an answer
0.5 Me V
1.13 MeV
5.13 MeV
1.13 keV
1.13 eV
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Question # 31
Phenomenon of radioactivity is due to disintegration of
Choose an answer
nucleus
neutron
proton
molecule
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