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

Due to emission of 𝖰+ − 𝒓𝒂𝒚𝒔:

Question # 2

A count rate 240 per minute reduces to 30 counts per min in 1 hour. The half-life of source is:

Question # 3

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

Question # 4

Three quarks make up a:

Question # 5

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

Question # 6

𝑎, 𝖰 𝒂𝒏𝒅 radiations come out of radioactive substance:

Question # 7

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

Question # 8

Beta particles have penetration of about:

Question # 9

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 # 10

The phenomenon of radioactivity is associated with:

Question # 11

Which of the following have maximum ionization power?

Question # 12

A radioactive nucleus can emit:

Question # 13

Half-life of radon gas is:

Question # 14

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

Question # 15

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

Question # 16

Beta particles have less ionizing power than that of alpha particles because:

Question # 17

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

Question # 18

The rate of decay radioactive substance:

Question # 19

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

Question # 20

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

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Sr.# Question Answer
1 A radioactive isotope 𝟐𝟑𝟖 𝑼 decays consecutively to 𝟐𝟑𝟒 𝑼 the particles emitted are:
A. One 𝛼 and one 𝛽
B. Two 𝛼 and one 𝛽
C. e 𝛼 and two 𝛽
D. Two 𝛼 and two 𝛽
2 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
3 Because of large mass when 𝑎 −paricle enters the atom or molecule it:
A. Moves in zigzag path
B. Moves along straight line
C. Moves along circular path
D. None of these
4 If the radioactive substance reduces to 𝟏 𝟏𝟔 PHYSICS of its original mass in 40 days then its half-life is:
A. 10days
B. 20days
C. 40days
D. 4days
5 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
6 A radioactive nucleus can emit:
A. Electron
B. 𝛼 particles
C. Positron
D. Any of these
7 When a radioactive nucleus remits a beta particle, the proton neutron ratio:
A. Decreases
B. Increases
C. Remain same
D. None of the above
8 Which of the following have maximum ionization power?
A. 𝛼 −rays
B. 𝛽 −rays
C. 𝛾 −rays
D. Same for all
9 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
10 Which row is correct for fission and for fusion?
A. Produces larger nuclei
B. Produces larger nuclei
C. Produces smaller nuclei
D. Produces smaller nuclei
11 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
12 Half-life of radon gas is:
A. 1620 years
B. 3.8 days
C. 7 days
D. 11 days
13 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
14 The most penetrating radiations out of the following is that of
A. 𝛾-rays
B. β-rays
C. α-particles
D. X-rays
15 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
16 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
17 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
18 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
19 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

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