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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test MCQs With Answers
Question # 1
Different radioactive material have
Choose an answer
same half lives
different half lives
same mean lives
same total lives
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Question # 2
Alfa , beta and gamma rays are emitted from a radio-active substance
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spontaneously
when it is heated
when it is exposed to light
When it interacts with the other particle
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Question # 3
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 # 4
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 # 5
If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
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Equal to 1
Less than 1
Greater than 1
Infinity
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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
Which of these is not a radiation detector
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Wilson cloud chamber
cyclotron acceleration
Geiger Miller counter
solid state detector
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Question # 8
The energy is found from Einstein's mass energy relation is called
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binding energy of electron
binding energy of proton
binding energy of neutron
binding energy of nucleus
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Question # 9
When thorium nucleus emits aβ-particle, the daughter nucleus is called:
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Protactinium
Actinium
Uranium
Radium
Redon
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Question # 10
A pair of quark and antiquark makes a:
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Meson
Baryon
Proton
Neutron
None of these
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Question # 11
Pair production take place when energy of
γ-rays photon is
Choose an answer
equal to 1.02 Mev-
greater than 1.02 Mev
less than 1.02 Mev
none of these
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Question # 12
When radioactive nucleus emits a
β-particle, the proton-neutron ratio
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decrease
increase
same
none of these
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Question # 13
Radioactivity was discovered by
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Rutherford
Henri Becqureal
Maxwell
James Chadwick
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Question # 14
The nucleus/nuclei of hydrogen is/are:
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Proton
Deuteron
Triton
All of these
None of these
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Question # 15
Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
Choose an answer
50
100
150
200
250
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Question # 16
β-particles are easily deflected by collisions than heavy
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α-particles
β-particles
γ-particles
none of these
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