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

Question # 1

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 # 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:

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

Question # 3

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 # 4

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 # 5

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 # 6

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 # 7

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 # 8

Which of the following have maximum ionization power?

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

Question # 9

Three quarks make up a:

Leptons A
Mesons B
Baryons C
Quark D

Question # 10

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 # 11

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 # 12

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 # 13

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

Isotopes A
Isobars B
Isomers C
Isodiapheres D

Question # 14

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 # 15

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 # 16

The most penetrating radiations out of the following is that of

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

Question # 17

Half-life of radon gas is:

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

Question # 18

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

220 A
230 B
235 C
240 D

Question # 19

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 # 20

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

Sr.#	Question	Answer
1	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
2	The particles equal in mass or greater than mass of protons are called:	A. Leptons B. Mesons C. Baryons D. Quarks
3	Three quarks make up a:	A. Leptons B. Mesons C. Baryons D. Quark
4	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
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	The most penetrating radiations out of the following is that of	A. 𝛾-rays B. β-rays C. α-particles D. X-rays
7	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
8	The more readily fissionable isotope of uranium has an atomic mass of:	A. 220 B. 230 C. 235 D. 240
9	Half-life of radon gas is:	A. 1620 years B. 3.8 days C. 7 days D. 11 days
10	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

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

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