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Online Tests
Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test MCQs With Answers
Question # 1
The nucleus/nuclei of hydrogen is/are:
Choose an answer
Proton
Deuteron
Triton
All of these
None of these
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Question # 2
How many isotopes of helium are present?
Choose an answer
1
2
3
4
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Question # 3
In 1932 Chadwick discovered
Choose an answer
proton
neutron
photon
electron
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Question # 4
Neutrons are
Choose an answer
positive charge
negatively charged
massless
neutral
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Question # 5
Rate of decay is actually described by.
Choose an answer
Half line
Decay constant
Mean life
Total life
None of these
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Question # 6
The half lie of radium-226 is
Choose an answer
238 years
4.5 x 10
9
days
1620 years
332 years
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Question # 7
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 # 8
The unit of decay constant is
Choose an answer
sex
sec
2
sec
-1
sec
-2
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Question # 9
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 # 10
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 # 11
For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
Choose an answer
A - Z
A + Z
Z
A
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Question # 12
Three quarks make:
Choose an answer
An electron
A meson
A baryon
A photon
None of these
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Question # 13
The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
Choose an answer
3 more neutrons
3 more electrons
3 more protons
3 more ions
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Question # 14
For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is
Choose an answer
A - Z
A
Z
A + Z
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Question # 15
For Protium, the mass defect is:
Choose an answer
Infinite
Zero
Very large
A few grams
None of these
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