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

Question # 1

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 # 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:

12days A
10days B
22days C
36days D

Question # 3

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 # 4

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 # 5

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 # 6

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

Leptons A
Mesons B
Baryons C
Quarks D

Question # 7

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 # 8

Which of the following have maximum ionization power?

𝛼 −rays A
𝛽 −rays B
𝛾 −rays C
Same for all D

Question # 9

A radioactive nucleus can emit:

Electron A
𝛼 particles B
Positron C
Any of these D

Question # 10

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 # 11

𝑎, 𝖰 𝒂𝒏𝒅 radiations come out of radioactive substance:

Spontaneously A
When it is put in a reactor B
When it is heated C
Under pressure D

Question # 12

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 # 13

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 # 14

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 # 15

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 # 16

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

Question # 17

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 # 18

The half-life of a certain element is 3.5 days at STP. If the temperature is doubled and pressure is reduced to half then half-life of the same element will be:

1.75 days A
3.5 days B
7 days C
14 days D

Question # 19

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 # 20

In nuclear fission reaction, when the products are 140X and 94Sr, the number of neutrons emitted is

1 A
2 B
5 C
9 D

Sr.#	Question	Answer
1	The activity of a radioactive sample is 1.6 curie and half-life is 2.5 days. Its activity after 10 days will be:	A. 0.8 Curie B. 0.1Curie C. 0.4 Curie D. 0.16 Curie
2	When a radioactive nucleus emits a 𝖰 −paritcles, the mass number of the atom:	A. Increases by one B. Decreases by one C. Remains the same D. Decreases by four
3	When a radioactive nucleus remits a beta particle, the proton neutron ratio:	A. Decreases B. Increases C. Remain same D. None of the above
4	The half-life of a radioactive element which has only 1//32 of its original mass left after a lapse of 60 days is:	A. 12days B. 10days C. 22days D. 36days
5	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
6	A thorium nucleus is formed when a uranium nucleus emits an 𝑎 −particles. Atomic number of thorium is :	A. 23 B. 60 C. 90 D. 70
7	Which of the following have maximum ionization power?	A. 𝛼 −rays B. 𝛽 −rays C. 𝛾 −rays D. Same for all
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	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
10	The binding energy per nucleon is:	A. Greater for heavy nuclei B. Least for heavy nuclei C. Greatest for light nuclei D. Greatest for medium nuclei

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

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