Question # 1

The example of nuclear fusion is:

Choose an answer

Formation of barium and krypton from uranium

Formation of plutonium -235 from uranium -235

Formation of helium from hydrogen

Formation of water from hydrogen and oxygen

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

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

Choose an answer

1

2

5

9

The rate of decay radioactive substance:

Choose an answer

Is constant

Decrease exponentially with time

Varies inversely with time

Decrease linearly with time

The most penetrating radiations out of the following is that of

Choose an answer

𝛾-rays

β-rays

α-particles

X-rays

Due to emission of 𝖰+ − 𝒓𝒂𝒚𝒔:

Choose an answer

Mass of the nucleus increases

Mass of the nucleus decreases

Charge on the nucleus increases

Charge number decreases

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

Choose an answer

220

230

235

240

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

Choose an answer

Leptons

Mesons

Baryons

Quarks

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

Half-life of radon gas is:

Choose an answer

1620 years

3.8 days

7 days

11 days

During a negative β-decayv

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

Three quarks make up a:

Choose an answer

Leptons

Mesons

Baryons

Quark

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

Choose an answer

Decreases

Increases

Remain same

None of the above

A radioactive substance has a half-life of 4 months. Three-fourths of the substance will decay in:

Choose an answer

5months

6months

8months

7months

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 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

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

Choose an answer

At high temperature and high pressure

At high temperature and low pressure

At low temperature and low pressure

At low temperature and high pressure

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

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