Physics · JEE

Composition and size of nucleus, atomic masses, mass-energy relation, mass defect Mock Test for JEE

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Syllabus context

Part of Atoms and Nuclei in JEE Main Physics.

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Q1PhysicsUnit 18: Atoms and Nuclei

Which of the following pairs are isotopes?

Q2PhysicsUnit 18: Atoms and Nuclei

Assertion The mass of a nucleus can be either less than or more than the sum of the masses of nucleons present in it. Reason The whole mass of the atom is concentrated in the nucleus.

Q3PhysicsUnit 18: Atoms and Nuclei

The missing particle in the reaction:

\underset{99}{253} \boldsymbol{E} \boldsymbol{s}+_{2}^{4} \boldsymbol{H} \boldsymbol{e} \rightarrow_{101}^{256} \boldsymbol{M} \boldsymbol{d}+

Q4PhysicsUnit 18: Atoms and Nuclei

A radioactive material decays by simultaneous emission of two particles with half-lives 1620 yr and 810 yr respectively. The time in years after which one-fourth of material remains, is

Q5PhysicsUnit 18: Atoms and Nuclei

Assertion A nucleus having enrgy

E_{1}

decays by

\beta

emission to daughter nucleus having energy

E_{2}

but the

\beta

-rays are emitted with a continuous energy spectrum having end point energy

\boldsymbol{E}_{\mathbf{1}}-\boldsymbol{E}_{\mathbf{2}}

Reason To conserve energy and moment in

\boldsymbol{\beta}

decays at least three particles must take part in the transformation.

Q6PhysicsUnit 18: Atoms and Nuclei

When a radioactive nucleus emits a

\beta

particular, the proton- neutron ratio

Q7PhysicsUnit 18: Atoms and Nuclei

\alpha

and

\beta

- particles emitted when uranium nucleus

_{92} U^{238}

decay to

82 P b^{214}

are

Q8PhysicsUnit 18: Atoms and Nuclei

Beta particles are essentially:

Q9PhysicsUnit 18: Atoms and Nuclei

Assertion Heavy nuclides tend to have more number of neutrons than protons. Reason In heavy nuclei, as there is coloumbic repulsion between protons, so excess of neutrons are preferable.

Q10PhysicsUnit 18: Atoms and Nuclei

Which of the following change the activity of radioisotope?

Q11PhysicsUnit 18: Atoms and Nuclei

A radioactive nucleus emits an

\alpha

particle and a neutron simultaneously with speed but in opposite direction in order to form a stable nuclei. If the speed of emitted particles is

v

and

A

is the mass number of radioactive nucleus, then speed of stable nucleus is:

Q12PhysicsUnit 18: Atoms and Nuclei

Statement A: Density of nucleus is independent of its mass number Statement B: Beryllium is used as a moderator in nuclear reactors

Q13PhysicsUnit 18: Atoms and Nuclei

Which one of the following is unstable

Q14PhysicsUnit 18: Atoms and Nuclei

^{22} N e

nucleus, after absorbing energy decays into two

\alpha

-particles and an unknown nucleus. The unknown nucleus is

Q15PhysicsUnit 18: Atoms and Nuclei

An atom which has a mass number of 14 and has 8 neutrons is an:

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