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Online Tests
Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test MCQs With Answers
Question # 1
The rate of decay of radioactive substance
Choose an answer
is constant
decrease exponentially with time
varies inversely as time
decreases linearly with time
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Question # 2
Nucleon means:
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Only electrons
Only neutrons
Only protons
Both (A ) and (C)
Both (B) and (C)
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Question # 3
The number of isotopes of hydrogen are
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2
1
3
4
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Question # 4
A mass difference of 0.0012 u is equivalent to and energy of:
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0.5 Me V
1.13 MeV
5.13 MeV
1.13 keV
1.13 eV
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Question # 5
Maric Curie and Pieree Curie discovered two new radioactive elements, which are called
Choose an answer
polonium uranium
uranium and radium
polonium and radium
none of these
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Question # 6
1 amu is equal to
Choose an answer
1.66 x 10
-24
kg
1.66 x 10
-19
kg
1.66 x 10
-34
kg
1.66 x 10
-27
kg
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Question # 7
The diameter of an atom is of the order
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10
-125
m
10
-11
m
10
-10
m
10
-9
m
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Question # 8
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 # 9
The figure 1.007276μ shows the mass of an:
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Atom
Positron
Electron
Neutron
Proton
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Question # 10
The isotope/s of hydrogen is /are:
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Protium
Deuterium
Tritium
Both (A) and (B)
All of these
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Question # 11
The total charge of any nucleus is given as
Choose an answer
Ze
2
Z
2
e
Z/e
Ze
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Question # 12
Structure of the nucleus was explained by
Choose an answer
J.J Thomson
Bohr
Millikan
Rutherford
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Question # 13
Radioactivity
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is exhibited more by semiconductors in general
in exhibited more by the element when they are coupled
with other radioactive elements by a covalent bond
is an atomic property of radioactive elements
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Question # 14
Phenomenon of radioactivity is due to disintegration of
Choose an answer
nucleus
neutron
proton
molecule
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Question # 15
Radium was discovered by:
Choose an answer
Becquerel
Marie curie
Pierre curie
Rutherford
Both (B) and (C)
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Question # 16
Different radioactive material have
Choose an answer
same half lives
different half lives
same mean lives
same total lives
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