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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test MCQs With Answers
Question # 1
In his experiment on nuclear reactions, Rutherford bombardedα particles on:
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Nitrogen
Hydrogen
Lead
Oxygen
Krypton
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Question # 2
Referring to the above figure, we can say that of all the elements, the most stable element is
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Phosphours
Iron
uranium
Lithium
Bismuth
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Question # 3
For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
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A - Z
A + Z
Z
A
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Question # 4
The nuclei of an element having the same charge number but different mass numbers are called:
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Isobars
Isotopes
Isomers
Isobaric
Isothermal
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Question # 5
The rate of decay of a radioactive substance
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decrease exponentially with time
decreases linearly with time
increases linearly with time
increases exponentially with time
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Question # 6
When a charged particle passes through matter, it produces ionization, this effect is used in
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fission reaction
reactor
radiation detector
fusion reaction
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Question # 7
The unit of decay constant is:
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Second
Metre
Hour
Year
Second
-1
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Question # 8
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 # 9
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 # 10
Nucleus consists of
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proton and neutron
protons and electron
electron and neutron
protons only
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Question # 11
Neutron was suggested to be in the nucleus by:
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Rutherford in 1920
Bohar in 1913
Dirac in 1928
Anderson in 1932
None of these
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Question # 12
For an atom having atomic number Z and atomic weight A, the charge on the nucleus is
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A - Z
A + Z
Z
A
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Question # 13
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 # 14
In wilson cloud chamber, the air becomes saturated with:
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Alcohol vapours
Water
Helium gas
Nitrogen gas
None of these
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Question # 15
Radium was discovered by:
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Becquerel
Marie curie
Pierre curie
Rutherford
Both (B) and (C)
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Question # 16
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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