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

Question # 1

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

220 A
230 B
235 C
240 D

Question # 2

Which of the following have maximum ionization power?

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

Question # 3

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 # 4

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 # 5

The number of electrons in a nucleus X of atomic number Z and mass number A is:

A A
W B
Z C
Y D

Question # 6

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 # 7

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 # 8

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

Question # 9

Which row is correct for fission and for fusion?

Produces larger nuclei A
Produces larger nuclei B
Produces smaller nuclei C
Produces smaller nuclei D

Question # 10

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 # 11

Half-life of radon gas is:

1620 years A
3.8 days B
7 days C
11 days D

Question # 12

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 # 13

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 # 14

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 # 15

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 # 16

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 # 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

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 # 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	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
2	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
3	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
4	In nuclear fission reaction, when the products are 140X and 94Sr, the number of neutrons emitted is	A. 1 B. 2 C. 5 D. 9
5	𝑎, 𝖰 𝒂𝒏𝒅 radiations come out of radioactive substance:	A. Spontaneously B. When it is put in a reactor C. When it is heated D. Under pressure
6	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
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:	A. Protons and positrons B. 𝛼 −partilces C. neutrons D. Protons and 𝛼 −partilces
8	A count rate 240 per minute reduces to 30 counts per min in 1 hour. The half-life of source is:	A. 20min B. 60min C. 80min D. 90min
9	Half-life of radon gas is:	A. 1620 years B. 3.8 days C. 7 days D. 11 days
10	Three quarks make up a:	A. Leptons B. Mesons C. Baryons D. Quark

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

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