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

MCQ's Test For MDCAT Physics Chapter 16 Nuclear Physics MCQ's Test

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MDCAT Physics Chapter 16 Nuclear Physics MCQ's Test

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Question # 1

A radioactive substance has a half-life of 4 months. Three-fourths of the substance will decay in:

Question # 2

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

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:

Question # 4

During a negative β-decay

Question # 5

If the radioactive substance reduces to 𝟏 𝟏𝟔 PHYSICS of its original mass in 40 days then its half-life is:

Question # 6

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:

Question # 7

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

Question # 8

The phenomenon of radioactivity is associated with:

Question # 9

In an 𝑎 −decay:

Question # 10

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

Question # 11

Due to emission of 𝖰+ − 𝒓𝒂𝒚𝒔:

Question # 12

When a radioactive nucleus remits a beta particle, the proton neutron ratio:

Question # 13

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:

Question # 14

A thorium nucleus is formed when a uranium nucleus emits an 𝑎 −particles. Atomic number of thorium is :

Question # 15

Because of large mass when 𝑎 −paricle enters the atom or molecule it:

Question # 16

Three quarks make up a:

Question # 17

When a radioactive nucleus emits a 𝖰 −paritcles, the mass number of the atom:

Question # 18

The activity of a radioactive sample is 1.6 curie and half-life is 2.5 days. Its activity after 10 days will be:

Question # 19

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

Question # 20

Which row is correct for fission and for fusion?

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MCAT Physics Chapter 16 Important MCQ's

Sr.# Question Answer
1 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
2 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
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:
A. 12days
B. 10days
C. 22days
D. 36days
4 Due to emission of 𝖰+ − 𝒓𝒂𝒚𝒔:
A. Mass of the nucleus increases
B. Mass of the nucleus decreases
C. Charge on the nucleus increases
D. Charge number decreases
5 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
6 Half-life of radon gas is:
A. 1620 years
B. 3.8 days
C. 7 days
D. 11 days
7 The most penetrating radiations out of the following is that of
A. 𝛾-rays
B. β-rays
C. α-particles
D. X-rays
8 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
9 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
10 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

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