Elementary Modern Physics: JAMB Physics Questions, Answers & Notes

What Elementary Modern Physics covers in the JAMB Physics syllabus

An atom has a nucleus of protons (positive) and neutrons (neutral), surrounded by electrons (negative). The atomic number = number of protons; the mass number = protons + neutrons; isotopes are atoms of one element with different neutron numbers. Unstable nuclei show radioactivity, emitting alpha (helium nucleus, least penetrating), beta (fast electron) or gamma (most penetrating) radiation; half-life is the time for half a sample to decay. Nuclear fission splits heavy nuclei and fusion joins light ones (the Sun), both releasing energy. Light of sufficient frequency ejects electrons (photoelectric effect); photon energy E = hf.

For Elementary Modern Physics, JAMB expects you to be able to:

• Describe atomic structure, atomic/mass number and isotopes
• Explain radioactivity, the three radiations, half-life, fission and fusion
• Explain the photoelectric effect and photon energy E = hf

Key facts & revision notes: Elementary Modern Physics

These are the recurring points our Elementary Modern Physics questions test — revise them until each feels automatic, then practise the questions above to lock them in.

• An atom is made of protons, neutrons and electrons.
• The electron carries a negative charge.
• The neutron is electrically neutral (no charge).
• The atomic number equals the number of protons in the nucleus.
• Mass number = number of protons + number of neutrons (the nucleons).
• Isotopes are atoms of the same element (same protons) with different numbers of neutrons.
• Radioactivity is the spontaneous emission of radiation from unstable nuclei.
• The three main types of radiation are alpha (α), beta (β) and gamma (γ).
• Gamma rays are the most penetrating; alpha particles are the least penetrating.
• Alpha particles are stopped by a sheet of paper (least penetrating).
• An alpha particle is a helium nucleus (2 protons + 2 neutrons).
• A beta particle is a high-speed electron emitted from the nucleus.
• Half-life is the time for half of the radioactive nuclei in a sample to decay.
• 6 days = 3 half-lives, so the fraction left is (1/2)³ = 1/8.
• In the photoelectric effect, the threshold frequency is the minimum frequency that ejects electrons.
• The photoelectric effect is the ejection of electrons from a metal by incident light of high enough frequency.
• Photon energy E = hf, where h is Planck's constant and f the frequency.
• Nuclear fission is the splitting of a heavy nucleus into lighter ones, releasing energy.
• Nuclear fusion joins light nuclei into a heavier one, releasing energy — the Sun's energy source.
• In beta-minus decay a neutron becomes a proton, so the atomic number increases by 1.
• Protons carry positive charge.
• The nucleus holds nearly all the atomic mass.
• A charged atom is an ion.
• A neutral atom has equal protons and electrons.

Worked examples

Three Elementary Modern Physics questions with the answer and a short explanation, so you can see how the topic is set before you practise the full set.

How Elementary Modern Physics is tested in JAMB Physics

Our Elementary Modern Physics bank holds 40 questions (5 easy, 23 medium, 12 hard). JAMB Physics typically returns to Elementary Modern Physics year after year, so steady practice on this topic is high-value revision. Questions are multiple-choice with four options, and at UTME pace you get roughly 40 seconds each — which is why timed practice matters.

How to answer Elementary Modern Physics questions

Work the stem first and predict the answer before you look at the options; then eliminate the ones that contradict the key facts above. Watch for “which is not…”, “all of the above” and “except” style stems, which are where rushed candidates lose easy marks on Elementary Modern Physics. If a calculation or a precise definition is involved, work it from first principles rather than guessing from a half-remembered rule. When two options look right, re-read the stem for the qualifier that separates them — JAMB rarely repeats an option by accident. If you are still unsure, eliminate the two weakest choices to lift your odds, flag the question, and move on; never burn a full minute on one Physics item when the exam gives you about forty seconds each. Then come back to flagged questions with whatever time remains. The single most reliable way to get faster at Elementary Modern Physics is repeated timed practice, so use the button above until the recurring patterns feel automatic.

Common mistakes to avoid in Elementary Modern Physics

The errors that cost marks on Elementary Modern Physics are usually careless rather than conceptual: misreading a negative stem, confusing two similar terms, or rushing a definition you actually know. Candidates also over-rely on “expo” and last-minute cramming instead of understanding the topic — which fails the moment JAMB rephrases a familiar idea. Treat every option as a claim to be checked against the facts above, keep your working tidy for any calculation, and don’t change a considered answer on a hunch. Above all, revise Elementary Modern Physics actively by answering questions, not just by re-reading notes — recall under time is what the exam rewards.

Frequently asked questions

Is Elementary Modern Physics part of the JAMB Physics syllabus?

Yes. Elementary Modern Physics is a recognised topic in the JAMB Physics syllabus, covering describe atomic structure, atomic/mass number and isotopes. You should be able to recall its key facts and apply them to multiple-choice questions.

How many Elementary Modern Physics questions can I practise on Belmadeng?

There are 40 original, JAMB-standard Elementary Modern Physics questions in our free bank, each with the correct answer and a worked explanation. You can practise them untimed or as a timed test.

What are the most important points to know about Elementary Modern Physics?

An atom has a nucleus of protons (positive) and neutrons (neutral), surrounded by electrons (negative). The atomic number = number of protons; the mass number = protons + neutrons; isotopes are atoms of one element with different neutron numbers. Unstable nuclei show radioactivity, emitting alpha (h…

How do I answer Elementary Modern Physics questions quickly in JAMB?

Read the stem carefully, eliminate clearly wrong options, and match the remaining choices to the key facts for Elementary Modern Physics. Practising timed Elementary Modern Physics questions builds the speed you need for UTME's pace of about 40 seconds per question.

Are these JAMB Physics Elementary Modern Physics questions past questions or original?

They are original questions written to JAMB (UTME) standard and mapped to the official syllabus — not reproduced past papers. This keeps them legal to use freely while closely mirroring how the real exam tests the topic.

Where can I practise Elementary Modern Physics questions free without signing up?

Right here — tap “Start Elementary Modern Physics practice” on this page to begin instantly. Belmadeng's CBT practice is completely free and needs no sign-up, download or subscription.

About these questions: original, JAMB-standard items written from the official UTME Physics syllabus (last reviewed 2026-09-18). Belmadeng is an independent study platform and is not affiliated with JAMB. Spotted an error? Use the report link.