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

Question # 1

Which of the following have maximum ionization power?

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

Question # 2

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 # 3

A radioactive isotope 𝟐𝟑𝟖 𝑼 decays consecutively to 𝟐𝟑𝟒 𝑼 the particles emitted are:

One 𝛼 and one 𝛽 A
Two 𝛼 and one 𝛽 B
e 𝛼 and two 𝛽 C
Two 𝛼 and two 𝛽 D

Question # 4

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 # 5

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 # 6

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 # 7

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 # 8

Three quarks make up a:

Leptons A
Mesons B
Baryons C
Quark D

Question # 9

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 # 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 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 # 12

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

Leptons A
Mesons B
Baryons C
Quarks D

Question # 13

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 # 14

Half-life of radon gas is:

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

Question # 15

The most penetrating radiations out of the following is that of

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

Question # 16

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 # 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

When the radioactive nucleus emits a beta particle, the proton neutron ration:

increases by one A
Remains same B
Decreases by one C
Decreases by four D

Question # 19

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

Isotopes A
Isobars B
Isomers C
Isodiapheres D

Question # 20

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

220 A
230 B
235 C
240 D

Sr.#	Question	Answer
1	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
2	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
3	The number of electrons in a nucleus X of atomic number Z and mass number A is:	A. A B. W C. Z D. Y
4	The mother and daughter elements with the emission of 𝖰 − 𝒓𝒂𝒚𝒔, are called:	A. Isotopes B. Isobars C. Isomers D. Isodiapheres
5	The rate of decay radioactive substance:	A. Is constant B. Decrease exponentially with time C. Varies inversely with time D. Decrease linearly with time
6	In an 𝑎 −decay:	A. The parent and daughter nuclei have same number of protons B. The daughter nucleus has one proton more than parent nucleus C. The daughter nucleus has two protons less than parent nucleus D. The daughter nucleus has two neutrons more than parent nucleus
7	For atomic nucleus, the binding energy per nucleon with increase in mass number:	A. Increases continuously B. Remains same C. Decrease continuously D. First increases and then decreases with increase in mass number
8	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
9	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
10	The more readily fissionable isotope of uranium has an atomic mass of:	A. 220 B. 230 C. 235 D. 240

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