Interactive multiple-choice quiz: MODEL SIMULATION FOR THE END-OF-TERM 3 EXAMINATION 2025/2026

A

Radiation energy is emitted in a continuous and uninterrupted stream

B

The energy of vibrating atoms cannot increase under any circumstances

C

Energy is emitted or absorbed only in discrete, definite packets called quanta

D

The energy of a photon is always equal to the mass of an electron

A

The generation of nuclear energy from alpha particle collisions with gas

B

The emission of electrons from a metal surface when light of appropriate frequency strikes it

C

The refraction of light as it passes through a polarising crystal

D

The transition of an electron from a lower Bohr orbit to a higher orbit

A

The maximum frequency of light that releases electrons at the speed of light

B

The minimum frequency of incident light required to release electrons from a metal surface

C

The average electromagnetic frequency reflected by the atmosphere

D

The minimum frequency required to bind a neutron to a proton

A

$KE_{max} = hf - \Phi$

B

$KE_{max} = hf + \Phi$

C

$KE_{max} = \Phi - hf$

D

KE_max = p × v/2

A

The maximum kinetic energy increases linearly

B

The maximum kinetic energy decreases to zero

C

The maximum kinetic energy remains completely unaffected

D

The kinetic energy is converted into nuclear energy

A

It represents the work function ($\Phi$) of the metal

B

It represents the threshold frequency (f₀)

C

It represents Planck's constant (h)

D

It represents the charge of an electron

A

Photons lose their wave characteristics entirely over time

B

Moving physical particles have associated wave-like properties, just as light waves have particle-like properties

C

Atoms are completely hollow and contain no negatively charged particles

D

Time moves in circular orbits aligned with planetary motion

A

It is impossible to observe electrons inside heavy metal nuclei

B

It is impossible to measure both the mass and charge of an electron at the same time

C

It is impossible to simultaneously determine both the exact position and momentum of a particle with absolute certainty

D

All particles decay instantly when constrained inside a modern vacuum chamber

A

A dense positive central nucleus surrounded by rapid orbiting electrons

B

A homogeneous solid sphere of positive charge with negative electrons embedded throughout like raisins

C

A hollow probabilistic probability cloud harboring dielectric gaps

D

Indivisible physical atoms that fuse upon thermal contact

A

A continuous rainbow spectrum without any dark lines

B

A discrete series of bright, colored lines separated by dark intervals on a black background

C

A pure white light beam that exhibits no diffraction at all

D

A random emission of heavy alpha particles

A

By evaporating heavy radioactive elements in an insulated chamber

B

By passing continuous white light through a cool gas, which absorbs specific wavelengths and leaves dark lines in the spectrum

C

By accelerating cathode electrons beyond the speed of light

D

By doubling the frequency of incident UV light to overcome binding

A

When an electron stays stable in its ground state orbit (n=1)

B

When an electron transitions from a higher energy level to a lower energy level

C

When an alpha particle is captured by the nuclear force

D

When the entire atom is cooled near absolute zero Kelvin

A

0.53 Å (or 5.29 × 10^-11 m)

B

1.06 Å

C

2.12 Å

D

0.01 Å

A

Balmer Series

B

Paschen Series

C

Lyman Series (Ultraviolet)

D

Pfund Series

A

It tracks the electron along a precise, circular, predictable path

B

It defines a three-dimensional region of space (orbital) represents high probability of finding the electron

C

It expects electrons to collapse into the nucleus every second

D

It models electrons as stationary, non-moving points

A

Light Absorption by Stimulated Emission of Radiation

B

Light Amplification by Stimulated Emission of Radiation

C

Long Wave Amplification by Stimulated Electron Resonance

D

Light Accumulation by Spontaneous Emission of Radiation

A

A = Z + N

B

A = Z - N

C

Z = A + N

D

N = Z - A

A

To attract electrons and force them to collapse into the nucleus

B

To bind nucleons together (protons and neutrons) and overcome the electrostatic repulsion of positive protons

C

To drive radioactive beta decay over macroscopic distances

D

An electromotive force that spins the atoms

A

To attract electrons and keep them in stable Bohr orbits

B

To bind protons and neutrons together, overcoming the immense electrostatic Coulomb repulsion between protons

C

To generate distinct absorption lines in cool atomic gases

D

To accelerate photocurrent inside a zinc electrode

A

The Bohr first orbit radius

B

The binding energy per nucleon (E_b/A)

C

The absolute atomic mass of the nucleus

D

The neutron count divided by Planck's constant

A

A decreases by 4, Z decreases by 2

B

A remains unchanged, Z increases by 1

C

A increases by 4, Z increases by 2

D

Both A and Z remain completely unchanged

A

The total lifetime of the entire radioactive sample

B

The time required for exactly half of the radioactive nuclei in a sample to decay

C

The time required for all protons to convert into neutrons

D

The time it takes for a nucleus to complete one orbit

A

The combining of light nuclei to form a heavier nucleus

B

The splitting of a heavy, unstable nucleus into lighter fragments, releasing energy and neutrons

C

The decay of protons into free neutrons and positrons

D

The absorption of electrons by the strong nuclear force

A

The splitting of a heavy nucleus into lighter fragments

B

The combining of light nuclei to form a heavier, more stable nucleus, releasing energy

C

The radioactive decay of unstable neutrons

D

The capture of free electrons by atomic orbit fields

A

The Proton

B

The Neutron

C

The Electron (Lepton)

D

The Alpha particle