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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test MCQs With Answers
Question # 1
Radioactivity is
Choose an answer
self disruptive activity
spontaneous activity
exhibited by all elements under proper conditions
both 'a' and 'b'
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Question # 2
The rate of decay of a radioactive substance
Choose an answer
decrease exponentially with time
decreases linearly with time
increases linearly with time
increases exponentially with time
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Question # 3
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 # 4
1 amu is equal to.
Choose an answer
1.66 x 10
-24
kg
1.66 x 10
-19
kg
1.66 x 10
-24
kg
1.66 x 10
-27
kg
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Question # 5
The distance travelled by
α-particle in a medium before coming to rest, is called
Choose an answer
range of
γ-particle
range of neutrons
range of particle
none of these
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Question # 6
When a nucleus emits an alpha particle, it atomic mass decreased by
Choose an answer
2
1
4
3
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Question # 7
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 # 8
Which of the following material has longer half life
Choose an answer
radium
polonium
radium
uranium
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Question # 9
The half life of radioactive substances depends upon
Choose an answer
amount of substance
energy of substance
state of substance
temperature of substance
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Question # 10
Gamma rays consist of steam of
Choose an answer
electron
proton
photons
all of these
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Question # 11
The most abundant isotope of neon is
Choose an answer
neon-20
neon-21
neon-22
neon-23
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Question # 12
Heavy water is made of one oxygen atom and two atoms of:
Choose an answer
Protium
Deuterium
Tritium
Any of these
None of these
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Question # 13
Which of the following material has smaller has life
Choose an answer
uranium
polonium
radium
radian
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Question # 14
The number of all the protons and neutrons in a nucleus is known as
Choose an answer
atomic number
mass number
charge number
none of these
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Question # 15
Radiation detector are used to
Choose an answer
measure intensity of radiation
measure energy of radiation
difference between different types of radiation
all the above
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Question # 16
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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