IJMB Physics
Past Questions
19+ verified Physics past questions for IJMB. Step-by-step worked answers in 5 Nigerian languages.
Physics topics (2)
Sample Physics past questions
1. Force = mass ×
- A. velocity
- B. acceleration
- C. time
- D. distance
Answer: B
2. Reflection occurs at:
- A. A vacuum
- B. A mirror
- C. An open sky
- D. A black hole
Answer: B
3. The unit of frequency is the:
- A. Metre
- B. Second
- C. Hertz
- D. Newton
Answer: C
4. Work done = force ×
- A. time
- B. distance
- C. mass
- D. speed
Answer: B
5. Which is a conductor of electricity?
- A. Rubber
- B. Copper
- C. Plastic
- D. Wood
Answer: B
AI Explanation
**The reasoning** Conductors are materials that allow electric current (flow of electrons) to pass through them easily. Metals like **copper** have free electrons in their atomic structure that can move freely from atom to atom. When you connect copper to a battery or power source, these electrons flow smoothly, carrying electrical current. That's why copper is used in electrical wires, phone chargers, and all the cables around your house. Its atomic structure makes it perfect for conducting electricity. **Why the wrong options tempt you** **Rubber, plastic, and wood** are all **insulators** — they hold their electrons tightly and don't let current flow. You might pick them if you're guessing randomly, but notice: rubber and plastic are actually used to *cover* electrical wires specifically because they DON'T conduct! Wood might seem natural and "connective," but it blocks electricity (when dry). **Quick takeaway** **Metals conduct, non-metals insulate** — Copper and other metals have free electrons that carry current, while rubber, plastic, and wood trap their electrons and block flow. Think of the wire in your phone charger: copper inside, plastic outside!
6. Power is the rate of doing:
- A. Force
- B. Work
- C. Mass
- D. Distance
Answer: B
7. The first law of motion is also called the law of:
- A. Energy
- B. Inertia
- C. Gravity
- D. Friction
Answer: B
AI Explanation
**The reasoning** Newton's First Law states: "A body at rest stays at rest, and a body in motion continues in uniform motion in a straight line, *unless* acted upon by an external force." The key concept here is **inertia** — the natural tendency of objects to resist changes in their state of motion. A ball won't roll by itself (resists starting), and a moving car wants to keep moving when you brake (resists stopping). This "stubbornness" to change is inertia, and it's directly related to the object's mass. That's why Newton's First Law is called the **Law of Inertia**. **Why the wrong options tempt you** - **Energy** relates to the capacity to do work (that's a different concept entirely) - **Gravity** is a force that pulls objects together (Newton's Law of Universal Gravitation) - **Friction** is a force that opposes motion, but it's not what the First Law describes fundamentally These are all physics terms you're studying, so they sound plausible! But they describe *different* principles. **Quick takeaway** Remember: "First Law = Inertia" — objects resist change unless you push or pull them!
8. SI unit of energy:
- A. newton
- B. joule
- C. watt
- D. ampere
Answer: B
AI Explanation
Energy is measured in joules (J).
9. Acceleration due to gravity (Earth, approx):
- A. 5 m/s²
- B. 9.8 m/s²
- C. 15 m/s²
- D. 100 m/s²
Answer: B
AI Explanation
Standard g ≈ 9.81 m/s² at Earth's surface.
10. Power =
- A. force × distance
- B. work ÷ time
- C. mass × acceleration
- D. voltage × current²
Answer: B
AI Explanation
Power = work done per unit time. SI unit: watt = J/s.
11. Ohm's law: V =
- A. I/R
- B. IR
- C. I + R
- D. I − R
Answer: B
AI Explanation
V = IR (voltage = current × resistance) for resistive circuits.
12. Speed of light in vacuum (approx):
- A. 3 × 10⁵ m/s
- B. 3 × 10⁸ m/s
- C. 3 × 10¹⁰ m/s
- D. 3 × 10² m/s
Answer: B
AI Explanation
c ≈ 3 × 10⁸ m/s.
13. Which is a vector?
- A. mass
- B. time
- C. velocity
- D. temperature
Answer: C
AI Explanation
Vectors have magnitude AND direction. Velocity does; mass/time/temperature don't.
14. Frequency unit:
- A. volt
- B. hertz
- C. ohm
- D. newton
Answer: B
AI Explanation
Frequency is measured in hertz (Hz) = 1 cycle/sec.
15. Kinetic energy formula:
- A. mgh
- B. ½mv²
- C. mv
- D. Fd
Answer: B
AI Explanation
KE = ½ × mass × velocity².
16. Potential energy of an object at height h:
- A. mv
- B. ½mv²
- C. mgh
- D. Fd
Answer: C
AI Explanation
Gravitational PE = mass × gravity × height (mgh).
17. Convex lenses are also called:
- A. diverging lenses
- B. converging lenses
- C. plano lenses
- D. cylindrical lenses
Answer: B
AI Explanation
Convex lenses converge parallel light to a focal point.
18. Heat transfer through fluids by movement of particles is:
- A. conduction
- B. convection
- C. radiation
- D. induction
Answer: B
AI Explanation
Convection involves bulk movement of warmer fluid carrying heat.
19. Resonance occurs when:
- A. objects vibrate at random
- B. an applied frequency matches the natural frequency of a system
- C. objects are stationary
- D. objects break
Answer: B
AI Explanation
At resonance, applied frequency = natural frequency, causing maximum amplitude.
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