Atomic and Nuclear physics Additional Practice Test

12th Standard Physics — Atomic and Nuclear physics: Additional Online Practice Test

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In J.J. Thomson's experiment to determine the specific charge of an electron, what is the configuration of the applied fields?

A.Parallel electric and magnetic fields B.Only a high-voltage electric field C.Only a uniform magnetic field D.Perpendicular electric and magnetic fields

In Millikan's oil drop experiment, the electric charge on any drop was found to be an integral multiple of which fundamental value?

A.\(1.6 \times 10^{-19}\) C B.\(3.2 \times 10^{-19}\) C C.\(9.1 \times 10^{-31}\) C D.\(1.7 \times 10^{11}\) C

According to Rutherford's scattering experiment, what is the relationship between the impact parameter and the scattering angle?

A.As impact parameter increases, scattering angle increases B.Scattering angle is independent of the impact parameter C.As impact parameter increases, scattering angle decreases D.Scattering angle first increases then decreases

In the Bohr atom model, the angular momentum of an electron revolving in a stationary orbit is quantized as an integral multiple of:

A.\(h\) B.\(h/\pi\) C.\(h/2\pi\) D.\(2\pi/h\)

How does the radius \(r_n\) of the \(n^{th}\) orbit of a hydrogen atom vary with the principal quantum number \(n\)?

A.\(r_n \propto n\) B.\(r_n \propto n^2\) C.\(r_n \propto 1/n\) D.\(r_n \propto \sqrt{n}\)

Which spectral series of the hydrogen atom lies in the visible region of the electromagnetic spectrum?

A.Lyman series B.Balmer series C.Paschen series D.Pfund series

In the standard nuclear notation \(_Z^A X\), what does the value of \(A - Z\) represent?

A.The number of protons B.The number of electrons C.The number of neutrons D.The total number of nucleons

Atoms of different chemical elements that possess the same number of neutrons are known as:

A.Isotopes B.Isobars C.Isotones D.Isomers

What is a characteristic property of nuclear density for nuclei with mass number \(A > 10\)?

A.It increases linearly with \(A\) B.It is inversely proportional to \(A\) C.It is approximately constant for all nuclei D.It depends on the number of orbiting electrons

Q10

Based on mass-energy equivalence, one atomic mass unit (u) is equivalent to approximately how much energy?

A.13.6 eV B.931 MeV C.200 MeV D.1.02 MeV

Q11

In a spontaneous alpha decay process, by how many units does the mass number of the parent nucleus decrease?

A.1 B.2 C.3 D.4

Q12

Which particle was proposed by Pauli to explain the continuous energy range of particles observed in beta decay?

A.Proton B.Positron C.Neutrino D.Gamma ray

Q13

What is the relationship between the decay constant \(\lambda\) and the half-life \(T_{1/2}\) of a radioactive sample?

A.\(T_{1/2} = \lambda / 0.6931\) B.\(T_{1/2} = 0.6931 \times \lambda\) C.\(T_{1/2} = 0.6931 / \lambda\) D.\(T_{1/2} = 1 / \lambda\)

Q14

In a nuclear reactor, what is the primary function of a moderator like heavy water?

A.To absorb excess neutrons and stop the reaction B.To slow down fast neutrons to thermal energies C.To increase the kinetic energy of emitted neutrons D.To shield the environment from radiation

Q15

Which fusion cycle is the most dominant energy source for the Sun according to Hans Bethe?

A.Carbon-nitrogen cycle B.Proton-proton cycle C.Helium-helium cycle D.Deuterium-tritium cycle

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About this Atomic and Nuclear physics test

This free online practice test covers Atomic and Nuclear physics from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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