Level: JHS, Basic 7 | Subject: Integrated Science | Strand: Forces and Energy | Topic: Electronic Components
Read the summary notes first, then try these questions. Go back to the summary notes for this topic.
Part A has 20 tick-box questions. Part B has 5 essay questions with a marking guide at the bottom.
Test Yourself: 20 Objective Questions
Tick one answer for each question, then press Review answer. If your answer is wrong, it will be marked first, then the correct answer will show in green.
1. The small parts used to build circuits in radios and phones are called
2. A resistor is used to
3. The unit of resistance is the
4. A capacitor is used to
5. The unit of capacitance is the
6. An inductor is basically a
7. The unit of inductance is the
8. A diode allows current to flow
9. A P-N diode is made by joining
10. LED stands for
11. Which component gives out light when current passes through it in the right direction?
12. One advantage of an LED bulb over an ordinary bulb is that it
13. Which component would you use in a camera flash to store charge?
14. Which component protects an LED from too much current?
15. A phone charger uses a diode to
16. The colour bands on a resistor show its
17. If an LED is connected the wrong way round, it will
18. Which of these is an electronic device?
19. Old phones and computers should be
20. Which is a safe practice with electronic devices?
Essay Questions
- State the function of each of these components: resistor, capacitor, inductor, diode, LED. (5 marks)
- Name the unit used to measure resistance, capacitance and inductance, with their symbols. (6 marks)
- Give three advantages of using LED bulbs instead of ordinary bulbs. (3 marks)
- Explain why an LED must be connected the right way round in a circuit. (3 marks)
- Describe three ways of disposing of old electronic devices safely and one danger of burning them. (4 marks)
Essay Questions: Marking Guide for Teachers and Parents
- Resistor: limits current (1). Capacitor: stores charge (1). Inductor: stores energy in a magnetic field and resists sudden changes in current (1). Diode: allows current in one direction only (1). LED: a diode that gives out light (1).
- Resistance: ohm (Ω) (2). Capacitance: farad (F) (2). Inductance: henry (H) (2).
- Any three: uses less electricity, lasts longer, stays cool, saves money (1 mark each).
- An LED is a diode (1). Current flows only in one direction through it (1). If it is connected wrongly, no current flows and it will not light (1).
- Any three: take to e-waste collection points, give to repairers or recyclers, return to sellers, reuse parts (1 mark each). Danger: burning gives off poisonous fumes (1).
Education Always (education.inspiringalways.com). Original practice questions, not official WAEC or BECE questions.