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

Question # 1

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:

1.75 days A
3.5 days B
7 days C
14 days 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

Half-life of radon gas is:

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

Question # 4

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

Isotopes A
Isobars B
Isomers C
Isodiapheres D

Question # 5

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 # 6

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 # 7

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

Question # 8

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 # 9

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 # 10

The phenomenon of radioactivity is associated with:

Fission of nucleus A
Disintegration of neutrons B
Emission of spectral lines C
Spontaneous disintegration of the nuclei of atoms D

Question # 11

The example of nuclear fusion is:

Formation of barium and krypton from uranium A
Formation of plutonium -235 from uranium -235 B
Formation of helium from hydrogen C
Formation of water from hydrogen and oxygen D

Question # 12

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 # 13

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 # 14

A radioactive nucleus can emit:

Electron A
𝛼 particles B
Positron C
Any of these D

Question # 15

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:

Protons and positrons A
𝛼 −partilces B
neutrons C
Protons and 𝛼 −partilces D

Question # 16

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

A A
W B
Z C
Y D

Question # 17

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 # 18

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 # 19

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

220 A
230 B
235 C
240 D

Question # 20

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

Sr.#	Question	Answer
1	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
2	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
3	When a radioactive nucleus remits a beta particle, the proton neutron ratio:	A. Decreases B. Increases C. Remain same D. None of the above
4	Three quarks make up a:	A. Leptons B. Mesons C. Baryons D. Quark
5	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
6	The rate of decay radioactive substance:	A. Is constant B. Decrease exponentially with time C. Varies inversely with time D. Decrease linearly with time
7	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
8	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
9	The fusion of hydrogen into helium is more likely to take place:	A. At high temperature and high pressure B. At high temperature and low pressure C. At low temperature and low pressure D. At low temperature and high pressure
10	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

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

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