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MDCAT Physics Chapter 13 Nuclear Physics of Solids Online Test MCQs With Answers
Question # 1
The particles equal in mass or greater than mass of protons are called:
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Leptons
Mesons
Baryons
Quarks
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Question # 2
In nuclear fission reaction, when the products are 140X and 94Sr, the number of neutrons emitted is
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1
2
5
9
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Question # 3
The most penetrating radiations out of the following is that of
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πΎ-rays
Ξ²-rays
Ξ±-particles
X-rays
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Question # 4
A radioactive nucleus can emit:
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Electron
πΌ particles
Positron
Any of these
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Question # 5
Due to emission of π°+ β ππππ:
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Mass of the nucleus increases
Mass of the nucleus decreases
Charge on the nucleus increases
Charge number decreases
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Question # 6
The phenomenon of radioactivity is associated with:
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Fission of nucleus
Disintegration of neutrons
Emission of spectral lines
Spontaneous disintegration of the nuclei of atoms
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Question # 7
The binding energy per nucleon is:
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Greater for heavy nuclei
Least for heavy nuclei
Greatest for light nuclei
Greatest for medium nuclei
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Question # 8
During a negative Ξ²-decayv
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An atomic electron is ejected
A neutron in the nucleus decays emitting an electron
An electron which already present within the nucleus is ejected
A part of binding energy of nuclei is converted into electron
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Question # 9
Nuclear fission experiments show that the neutrons the uranium nuclei into two fragment of about the same size. This process is accompanied by the emission of several:
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Protons and positrons
πΌ βpartilces
neutrons
Protons and πΌ βpartilces
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Question # 10
Three quarks make up a:
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Leptons
Mesons
Baryons
Quark
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Question # 11
The number of electrons in a nucleus X of atomic number Z and mass number A is:
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A
W
Z
Y
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Question # 12
In an π βdecay:
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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 # 13
Beta particles have less ionizing power than that of alpha particles because:
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Their smaller energy
Their smaller mass
Their smaller density
Their smaller charge
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Question # 14
The activity of a radioactive sample is 1.6 curie and half-life is 2.5 days. Its activity after 10 days will be:
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0.8 Curie
0.1Curie
0.4 Curie
0.16 Curie
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Question # 15
Half-life of radon gas is:
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1620 years
3.8 days
7 days
11 days
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Question # 16
π, π° πππ radiations come out of radioactive substance:
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Spontaneously
When it is put in a reactor
When it is heated
Under pressure
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Question # 17
When the radioactive nucleus emits a beta particle, the proton neutron ration:
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increases by one
Remains same
Decreases by one
Decreases by four
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Question # 18
A radioactive isotope πππ πΌ decays consecutively to πππ πΌ the particles emitted are:
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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 # 19
In 420 days, the activity of a sample of polonium (Po) fell to one-eight of its initial value. The half-life of polonium is :
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140days
45days
87days
90days
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Question # 20
Which row is correct for fission and for fusion?
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Produces larger nuclei
Produces larger nuclei
Produces smaller nuclei
Produces smaller nuclei
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