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 isotope πŸπŸ‘πŸ– 𝑼 decays consecutively to πŸπŸ‘πŸ’ 𝑼 the particles emitted are:

Question # 2

A thorium nucleus is formed when a uranium nucleus emits an π‘Ž βˆ’particles. Atomic number of thorium is :

Question # 3

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

Question # 4

In an π‘Ž βˆ’decay:

Question # 5

The uranium Nucleus πŸπŸ‘πŸ– 𝑼 undergoes successive decays, emitting respectively π‘Ž βˆ’ π’“π’‚π’š,𝖰 βˆ’ π’“π’‚π’š 𝒂𝒏𝒅 βˆ’ π’“π’‚π’šπ’”. What is the atomic number and atomic mass of the resulting nucleus:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

Three quarks make up a:

Question # 10

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

Question # 11

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 # 12

Beta particles have penetration of about:

Question # 13

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

Question # 14

Which row is correct for fission and for fusion?

Question # 15

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

Question # 16

For atomic nucleus, the binding energy per nucleon with increase in mass number:

Question # 17

Because of large mass when π‘Ž βˆ’paricle enters the atom or molecule it:

Question # 18

The most penetrating radiations out of the following is that of

Question # 19

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

Question # 20

During a negative Ξ²-decayv

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Sr.# Question Answer
1 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 βˆ’partilces
C. neutrons
D. Protons and 𝛼 βˆ’partilces
2 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
3 During a negative Ξ²-decayv
A. An atomic electron is ejected
B. A neutron in the nucleus decays emitting an electron
C. An electron which already present within the nucleus is ejected
D. A part of binding energy of nuclei is converted into electron
4 Due to emission of 𝖰+ βˆ’ π’“π’‚π’šπ’”:
A. Mass of the nucleus increases
B. Mass of the nucleus decreases
C. Charge on the nucleus increases
D. Charge number decreases
5 The half-life of a certain element is 3.5 days at STP. If the temperature is doubled and pressure is reduced to half then half-life of the same element will be:
A. 1.75 days
B. 3.5 days
C. 7 days
D. 14 days
6 Because of large mass when π‘Ž βˆ’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
7 A thorium nucleus is formed when a uranium nucleus emits an π‘Ž βˆ’particles. Atomic number of thorium is :
A. 23
B. 60
C. 90
D. 70
8 The particles equal in mass or greater than mass of protons are called:
A. Leptons
B. Mesons
C. Baryons
D. Quarks
9 When a radioactive nucleus emits a 𝖰 βˆ’paritcles, the mass number of the atom:
A. Increases by one
B. Decreases by one
C. Remains the same
D. Decreases by four
10 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
11 If the radioactive substance reduces to 𝟏 πŸπŸ” PHYSICS of its original mass in 40 days then its half-life is:
A. 10days
B. 20days
C. 40days
D. 4days
12 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
13 π‘Ž, 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
14 A radioactive isotope πŸπŸ‘πŸ– 𝑼 decays consecutively to πŸπŸ‘πŸ’ 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
15 Three quarks make up a:
A. Leptons
B. Mesons
C. Baryons
D. Quark
16 The rate of decay radioactive substance:
A. Is constant
B. Decrease exponentially with time
C. Varies inversely with time
D. Decrease linearly with time
17 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
18 Half-life of radon gas is:
A. 1620 years
B. 3.8 days
C. 7 days
D. 11 days
19 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

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