Question # 1

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

Choose an answer

Decreases

Increases

Remain same

None of the above

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

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

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:

Choose an answer

90, 238

91, 234

92, 236

92, 238

Beta particles have penetration of about:

Choose an answer

100 times more than that of the gamma particles

100 times less than that of an alpha ray

100 times more than that of an alpha ray

10 times more than that of an alpha particle

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

Choose an answer

Increases by one

Decreases by one

Remains the same

Decreases by four

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

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

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

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

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

Choose an answer

Increases continuously

Remains same

Decrease continuously

First increases and then decreases with increase in mass number

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

Choose an answer

10days

20days

40days

4days

Which of the following have maximum ionization power?

Choose an answer

𝛼 −rays

𝛽 −rays

𝛾 −rays

Same for all

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

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 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

A radioactive isotope 𝟐𝟑𝟖 𝑼 decays consecutively to 𝟐𝟑𝟒 𝑼 the particles emitted are:

Choose an answer

One 𝛼 and one 𝛽

Two 𝛼 and one 𝛽

e 𝛼 and two 𝛽

Two 𝛼 and two 𝛽

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

Choose an answer

220

230

235

240

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

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

Choose an answer

1

2

5

9

More Classes

Other Links

MDCAT Physics Chapter 16 Nuclear Physics 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