Question # 1

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

Choose an answer

Leptons

Mesons

Baryons

Quarks

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

Choose an answer

increases by one

Remains same

Decreases by one

Decreases by four

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 :

Choose an answer

140days

45days

87days

90days

Which of the following have maximum ionization power?

Choose an answer

𝛼 −rays

𝛽 −rays

𝛾 −rays

Same for all

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

Choose an answer

Decreases

Increases

Remain same

None of the above

The phenomenon of radioactivity is associated with:

Choose an answer

Fission of nucleus

Disintegration of neutrons

Emission of spectral lines

Spontaneous disintegration of the nuclei of atoms

During a negative β-decay

Choose an answer

An atomic electron is ejected

A neutron in the nucleus decays emitting an electron

An electron which already present within the nucleus is ejected

A part of binding energy of nuclei is converted into electron

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

Choose an answer

23

60

90

70

In an 𝑎 −decay:

Choose an answer

The parent and daughter nuclei have same number of protons

The daughter nucleus has one proton more than parent nucleus

The daughter nucleus has two protons less than parent nucleus

The daughter nucleus has two neutrons more than parent nucleus

The most penetrating radiations out of the following is that of

Choose an answer

𝛾-rays

β-rays

α-particles

X-rays

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

Choose an answer

Moves in zigzag path

Moves along straight line

Moves along circular path

None of these

The half-life of a radioactive element which has only 1//32 of its original mass left after a lapse of 60 days is:

Choose an answer

12days

10days

22days

36days

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

Choose an answer

0.8 Curie

0.1Curie

0.4 Curie

0.16 Curie

Half-life of radon gas is:

Choose an answer

1620 years

3.8 days

7 days

11 days

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:

Choose an answer

Protons and positrons

𝛼 −partilces

neutrons

Protons and 𝛼 −partilces

𝑎, 𝖰 𝒂𝒏𝒅 radiations come out of radioactive substance:

Choose an answer

Spontaneously

When it is put in a reactor

When it is heated

Under pressure

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

Choose an answer

20min

60min

80min

90min

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

Choose an answer

1

2

5

9

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

Choose an answer

Their smaller energy

Their smaller mass

Their smaller density

Their smaller charge

The binding energy per nucleon is:

Choose an answer

Greater for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium nuclei

More Classes

Other Links

MDCAT Physics Chapter 13 Nuclear Physics of Solids Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer