MDCAT Physics mcq test with answers for chapter 16 (Nuclear Physics)

Question # 1

A radioactive isotope 𝟐𝟑𝟖 𝑼 decays consecutively to 𝟐𝟑𝟒 𝑼 the particles emitted are:

One 𝛼 and one 𝛽 A
Two 𝛼 and one 𝛽 B
e 𝛼 and two 𝛽 C
Two 𝛼 and two 𝛽 D

Question # 2

In an 𝑎 −decay:

The parent and daughter nuclei have same number of protons A
The daughter nucleus has one proton more than parent nucleus B
The daughter nucleus has two protons less than parent nucleus C
The daughter nucleus has two neutrons more than parent nucleus D

Question # 3

The more readily fissionable isotope of uranium has an atomic mass of:

220 A
230 B
235 C
240 D

Question # 4

During a negative β-decay

An atomic electron is ejected A
A neutron in the nucleus decays emitting an electron B
An electron which already present within the nucleus is ejected C
A part of binding energy of nuclei is converted into electron D

Question # 5

The mother and daughter elements with the emission of 𝖰 − 𝒓𝒂𝒚𝒔, are called:

Isotopes A
Isobars B
Isomers C
Isodiapheres D

Question # 6

If the radioactive substance reduces to 𝟏 𝟏𝟔 PHYSICS of its original mass in 40 days then its half-life is:

10days A
20days B
40days C
4days D

Question # 7

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:

Protons and positrons A
𝛼 −partilces B
neutrons C
Protons and 𝛼 −partilces D

Question # 8

Beta particles have penetration of about:

100 times more than that of the gamma particles A
100 times less than that of an alpha ray B
100 times more than that of an alpha ray C
10 times more than that of an alpha particle D

Question # 9

When a radioactive nucleus remits a beta particle, the proton neutron ratio:

Decreases A
Increases B
Remain same C
None of the above D

Question # 10

A count rate 240 per minute reduces to 30 counts per min in 1 hour. The half-life of source is:

20min A
60min B
80min C
90min D

Question # 11

During a negative β-decayv

An atomic electron is ejected A
A neutron in the nucleus decays emitting an electron B
An electron which already present within the nucleus is ejected C
A part of binding energy of nuclei is converted into electron D

Question # 12

The phenomenon of radioactivity is associated with:

Fission of nucleus A
Disintegration of neutrons B
Emission of spectral lines C
Spontaneous disintegration of the nuclei of atoms D

Question # 13

Because of large mass when 𝑎 −paricle enters the atom or molecule it:

Moves in zigzag path A
Moves along straight line B
Moves along circular path C
None of these D

Question # 14

The uranium Nucleus 𝟐𝟑𝟖 𝑼 undergoes successive decays, emitting respectively 𝑎 − 𝒓𝒂𝒚,𝖰 − 𝒓𝒂𝒚 𝒂𝒏𝒅 − 𝒓𝒂𝒚𝒔. What is the atomic number and atomic mass of the resulting nucleus:

90, 238 A
91, 234 B
92, 236 C
92, 238 D

Question # 15

A thorium nucleus is formed when a uranium nucleus emits an 𝑎 −particles. Atomic number of thorium is :

23 A
60 B
90 C
70 D

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:

0.8 Curie A
0.1Curie B
0.4 Curie C
0.16 Curie D

Question # 17

The most penetrating radiations out of the following is that of

𝛾-rays A
β-rays B
α-particles C
X-rays D

Question # 18

The rate of decay radioactive substance:

Is constant A
Decrease exponentially with time B
Varies inversely with time C
Decrease linearly with time D

Question # 19

Three quarks make up a:

Leptons A
Mesons B
Baryons C
Quark D

Question # 20

For atomic nucleus, the binding energy per nucleon with increase in mass number:

Increases continuously A
Remains same B
Decrease continuously C
First increases and then decreases with increase in mass number D

Sr.#	Question	Answer
1	Three quarks make up a:	A. Leptons B. Mesons C. Baryons D. Quark
2	The uranium Nucleus 𝟐𝟑𝟖 𝑼 undergoes successive decays, emitting respectively 𝑎 − 𝒓𝒂𝒚,𝖰 − 𝒓𝒂𝒚 𝒂𝒏𝒅 − 𝒓𝒂𝒚𝒔. What is the atomic number and atomic mass of the resulting nucleus:	A. 90, 238 B. 91, 234 C. 92, 236 D. 92, 238
3	A radioactive nucleus can emit:	A. Electron B. 𝛼 particles C. Positron D. Any of these
4	For atomic nucleus, the binding energy per nucleon with increase in mass number:	A. Increases continuously B. Remains same C. Decrease continuously D. First increases and then decreases with increase in mass number
5	A radioactive substance has a half-life of 4 months. Three-fourths of the substance will decay in:	A. 5months B. 6months C. 8months D. 7months
6	When the radioactive nucleus emits a beta particle, the proton neutron ration:	A. increases by one B. Remains same C. Decreases by one D. Decreases by four
7	In an 𝑎 −decay:	A. The parent and daughter nuclei have same number of protons B. The daughter nucleus has one proton more than parent nucleus C. The daughter nucleus has two protons less than parent nucleus D. The daughter nucleus has two neutrons more than parent nucleus
8	The rate of decay radioactive substance:	A. Is constant B. Decrease exponentially with time C. Varies inversely with time D. Decrease linearly with time
9	If the radioactive substance reduces to 𝟏 𝟏𝟔 PHYSICS of its original mass in 40 days then its half-life is:	A. 10days B. 20days C. 40days D. 4days
10	The most penetrating radiations out of the following is that of	A. 𝛾-rays B. β-rays C. α-particles D. X-rays

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MDCAT Physics Chapter 16 MCQ Test With Answer for (Nuclear Physics)

MCQ's Test For MDCAT Physics Chapter 16 Nuclear Physics MCQ's Test

MDCAT Physics Chapter 16 Nuclear Physics MCQ's Test

A radioactive isotope 𝟐𝟑𝟖 𝑼 decays consecutively to 𝟐𝟑𝟒 𝑼 the particles emitted are:

In an 𝑎 −decay:

The more readily fissionable isotope of uranium has an atomic mass of:

During a negative β-decay

The mother and daughter elements with the emission of 𝖰 − 𝒓𝒂𝒚𝒔, are called:

If the radioactive substance reduces to 𝟏 𝟏𝟔 PHYSICS of its original mass in 40 days then its half-life is:

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:

Beta particles have penetration of about:

When a radioactive nucleus remits a beta particle, the proton neutron ratio:

A count rate 240 per minute reduces to 30 counts per min in 1 hour. The half-life of source is:

During a negative β-decayv

The phenomenon of radioactivity is associated with:

Because of large mass when 𝑎 −paricle enters the atom or molecule it:

The uranium Nucleus 𝟐𝟑𝟖 𝑼 undergoes successive decays, emitting respectively 𝑎 − 𝒓𝒂𝒚,𝖰 − 𝒓𝒂𝒚 𝒂𝒏𝒅 − 𝒓𝒂𝒚𝒔. What is the atomic number and atomic mass of the resulting nucleus:

A thorium nucleus is formed when a uranium nucleus emits an 𝑎 −particles. Atomic number of thorium is :

The activity of a radioactive sample is 1.6 curie and half-life is 2.5 days. Its activity after 10 days will be:

The most penetrating radiations out of the following is that of

The rate of decay radioactive substance:

Three quarks make up a:

For atomic nucleus, the binding energy per nucleon with increase in mass number:

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