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

Question # 1

The fusion of hydrogen into helium is more likely to take place:

At high temperature and high pressure A
At high temperature and low pressure B
At low temperature and low pressure C
At low temperature and high pressure D

Question # 2

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 # 3

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 # 4

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 # 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

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 # 7

Half-life of radon gas is:

1620 years A
3.8 days B
7 days C
11 days 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

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 # 10

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 # 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

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 # 13

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 # 14

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 # 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

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

220 A
230 B
235 C
240 D

Question # 17

Which of the following have maximum ionization power?

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

Question # 18

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

Leptons A
Mesons B
Baryons C
Quarks 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

The most penetrating radiations out of the following is that of

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

Sr.#	Question	Answer
1	Which of the following have maximum ionization power?	A. 𝛼 −rays B. 𝛽 −rays C. 𝛾 −rays D. Same for all
2	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
3	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
4	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
5	The particles equal in mass or greater than mass of protons are called:	A. Leptons B. Mesons C. Baryons D. Quarks
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	The fusion of hydrogen into helium is more likely to take place:	A. At high temperature and high pressure B. At high temperature and low pressure C. At low temperature and low pressure D. At low temperature and high pressure
8	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
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:	A. Protons and positrons B. 𝛼 −partilces C. neutrons D. Protons and 𝛼 −partilces
10	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

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

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