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

Question # 1

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 :

140days A
45days B
87days C
90days D

Question # 2

The binding energy per nucleon is:

Greater for heavy nuclei A
Least for heavy nuclei B
Greatest for light nuclei C
Greatest for medium nuclei D

Question # 3

A radioactive substance has a half-life of 4 months. Three-fourths of the substance will decay in:

5months A
6months B
8months C
7months D

Question # 4

The example of nuclear fusion is:

Formation of barium and krypton from uranium A
Formation of plutonium -235 from uranium -235 B
Formation of helium from hydrogen C
Formation of water from hydrogen and oxygen D

Question # 5

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 # 6

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 # 7

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 # 8

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 # 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:

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

Question # 10

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 # 11

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

Isotopes A
Isobars B
Isomers C
Isodiapheres D

Question # 12

The particles equal in mass or greater than mass of protons are called:

Leptons A
Mesons B
Baryons C
Quarks D

Question # 13

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 # 14

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

Question # 15

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 # 16

When a radioactive nucleus emits a 𝖰 −paritcles, the mass number of the atom:

Increases by one A
Decreases by one B
Remains the same C
Decreases by four D

Question # 17

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 # 18

A radioactive nucleus can emit:

Electron A
𝛼 particles B
Positron C
Any of these D

Question # 19

Due to emission of 𝖰+ − 𝒓𝒂𝒚𝒔:

Mass of the nucleus increases A
Mass of the nucleus decreases B
Charge on the nucleus increases C
Charge number decreases D

Question # 20

Beta particles have less ionizing power than that of alpha particles because:

Their smaller energy A
Their smaller mass B
Their smaller density C
Their smaller charge D

Sr.#	Question	Answer
1	Beta particles have penetration of about:	A. 100 times more than that of the gamma particles B. 100 times less than that of an alpha ray C. 100 times more than that of an alpha ray D. 10 times more than that of an alpha particle
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	Half-life of radon gas is:	A. 1620 years B. 3.8 days C. 7 days D. 11 days
4	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:	A. Protons and positrons B. 𝛼 −partilces C. neutrons D. Protons and 𝛼 −partilces
5	During a negative β-decay	A. An atomic electron is ejected B. A neutron in the nucleus decays emitting an electron C. An electron which already present within the nucleus is ejected D. A part of binding energy of nuclei is converted into electron
6	The phenomenon of radioactivity is associated with:	A. Fission of nucleus B. Disintegration of neutrons C. Emission of spectral lines D. Spontaneous disintegration of the nuclei of atoms
7	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 :	A. 140days B. 45days C. 87days D. 90days
8	Beta particles have less ionizing power than that of alpha particles because:	A. Their smaller energy B. Their smaller mass C. Their smaller density D. Their smaller charge
9	Which of the following have maximum ionization power?	A. 𝛼 −rays B. 𝛽 −rays C. 𝛾 −rays D. Same for all
10	The example of nuclear fusion is:	A. Formation of barium and krypton from uranium B. Formation of plutonium -235 from uranium -235 C. Formation of helium from hydrogen D. Formation of water from hydrogen and oxygen

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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

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 :

The binding energy per nucleon is:

A radioactive substance has a half-life of 4 months. Three-fourths of the substance will decay in:

The example of nuclear fusion is:

The phenomenon of radioactivity is associated with:

The rate of decay radioactive substance:

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

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

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:

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

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

The particles equal in mass or greater than mass of protons are called:

Beta particles have penetration of about:

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

During a negative β-decay

When a radioactive nucleus emits a 𝖰 −paritcles, the mass number of the atom:

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

A radioactive nucleus can emit:

Due to emission of 𝖰+ − 𝒓𝒂𝒚𝒔:

Beta particles have less ionizing power than that of alpha particles because:

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