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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test MCQs With Answers
Question # 1
Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
Choose an answer
deuterium
protium
tritium
none of these
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Question # 2
U-238 present in the natural uranium is about:
Choose an answer
59%
0.007%
99%
39%
19%
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Question # 3
The reciprocal of decay constant λ of a radioactive material is:
Choose an answer
Frequency
Half life
Year
Mean life
None of these
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Question # 4
The penetration power of
β-particle is
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zero
less than
α-particle
equal to
α-particle
greater than
α-particle
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Question # 5
A pair of quark and antiquark makes a:
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Meson
Baryon
Proton
Neutron
None of these
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Question # 6
How many isotopes of helium are present?
Choose an answer
1
2
3
4
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Question # 7
Different radioactive material have
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same half lives
different half lives
same mean lives
same total lives
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Question # 8
The half life of uranium-238 is
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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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Question # 9
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 # 10
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 # 11
During the nuclear changes, the law/s of conservation that hold/s are that of:
Choose an answer
Charge
energy
Momentum
Mass
All of these
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Question # 12
Neon gas have three isotopes whose atomic numbers are
Choose an answer
20, 24 , 23
20, 21 , 22
20, 19 , 21
none of these
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Question # 13
Charge on neutron is
Choose an answer
1.6 x 10
-19
C
zero
-1.6 x 10
-19
C
1.2 x 10
-19
C
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Question # 14
γ-rays behave like a particle because they explain the
Choose an answer
Compton effect
Photoelectric effect
Pair-production
all the above
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Question # 15
Alfa , beta and gamma rays are emitted from a radio-active substance
Choose an answer
spontaneously
when it is heated
when it is exposed to light
When it interacts with the other particle
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Question # 16
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 # 17
The number if neutrons in the nucleus of
92
U
235
are
Choose an answer
Infinite
92
235
143
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