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Online Tests
MDCAT Physics Chapter 16 Nuclear Physics Online Test MCQs With Answers
Question # 1
When a radioactive nucleus remits a beta particle, the proton neutron ratio:
Choose an answer
Decreases
Increases
Remain same
None of the above
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Question # 2
The half-life of a radioactive element which has only 1//32 of its original mass left after a lapse of 60 days is:
Choose an answer
12days
10days
22days
36days
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Question # 3
When the radioactive nucleus emits a beta particle, the proton neutron ration:
Choose an answer
increases by one
Remains same
Decreases by one
Decreases by four
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Question # 4
The uranium Nucleus πππ πΌ undergoes successive decays, emitting respectively π β πππ,π° β πππ πππ β ππππ. What is the atomic number and atomic mass of the resulting nucleus:
Choose an answer
90, 238
91, 234
92, 236
92, 238
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Question # 5
Beta particles have penetration of about:
Choose an answer
100 times more than that of the gamma particles
100 times less than that of an alpha ray
100 times more than that of an alpha ray
10 times more than that of an alpha particle
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Question # 6
When a radioactive nucleus emits a π° βparitcles, the mass number of the atom:
Choose an answer
Increases by one
Decreases by one
Remains the same
Decreases by four
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Question # 7
Beta particles have less ionizing power than that of alpha particles because:
Choose an answer
Their smaller energy
Their smaller mass
Their smaller density
Their smaller charge
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Question # 8
A count rate 240 per minute reduces to 30 counts per min in 1 hour. The half-life of source is:
Choose an answer
20min
60min
80min
90min
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Question # 9
The phenomenon of radioactivity is associated with:
Choose an answer
Fission of nucleus
Disintegration of neutrons
Emission of spectral lines
Spontaneous disintegration of the nuclei of atoms
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Question # 10
Because of large mass when π βparicle enters the atom or molecule it:
Choose an answer
Moves in zigzag path
Moves along straight line
Moves along circular path
None of these
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Question # 11
For atomic nucleus, the binding energy per nucleon with increase in mass number:
Choose an answer
Increases continuously
Remains same
Decrease continuously
First increases and then decreases with increase in mass number
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Question # 12
If the radioactive substance reduces to π ππ PHYSICS of its original mass in 40 days then its half-life is:
Choose an answer
10days
20days
40days
4days
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Question # 13
Which of the following have maximum ionization power?
Choose an answer
πΌ βrays
π½ βrays
πΎ βrays
Same for all
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Question # 14
π, π° πππ radiations come out of radioactive substance:
Choose an answer
Spontaneously
When it is put in a reactor
When it is heated
Under pressure
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Question # 15
In an π βdecay:
Choose an answer
The parent and daughter nuclei have same number of protons
The daughter nucleus has one proton more than parent nucleus
The daughter nucleus has two protons less than parent nucleus
The daughter nucleus has two neutrons more than parent nucleus
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Question # 16
The activity of a radioactive sample is 1.6 curie and half-life is 2.5 days. Its activity after 10 days will be:
Choose an answer
0.8 Curie
0.1Curie
0.4 Curie
0.16 Curie
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Question # 17
A radioactive isotope πππ πΌ decays consecutively to πππ πΌ the particles emitted are:
Choose an answer
One πΌ and one π½
Two πΌ and one π½
e πΌ and two π½
Two πΌ and two π½
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Question # 18
The more readily fissionable isotope of uranium has an atomic mass of:
Choose an answer
220
230
235
240
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Question # 19
The binding energy per nucleon is:
Choose an answer
Greater for heavy nuclei
Least for heavy nuclei
Greatest for light nuclei
Greatest for medium nuclei
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Question # 20
In nuclear fission reaction, when the products are 140X and 94Sr, the number of neutrons emitted is
Choose an answer
1
2
5
9
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