Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 855 · 40 questions

Remember (Find the topic, use the idea): Find the topic: circuit, safety, formula, component, program, sensor or IoT. Use that lesson’s rule — complete loop, V = I × R, P = V × I, last command wins, true → if part. Safety answers are always: low voltage, dry hands, an adult, never the mains.

1. 1.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a metal paper clip across the gap. Does the bulb glow? (a) No (b) Yes
2. 2.Which of these mainly gives out heat? (a) an electric toy car (b) an electric drill (c) an electric kettle (d) a table fan
3. 3.🔺 A current of 2 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
4. 4.Which of these mainly gives out light? (a) a water heater (b) a night lamp (c) a siren (d) an electric iron
5. 5.What does a tilt switch do? (a) closes near a magnet (b) closes when tipped over (c) works only while pressed (d) stays where you flip it
6. 6.🧮 Two resistors in parallel give a total that is … (a) always zero (b) less than either one (c) more than either one (d) their sum
7. 7.True or false: to change default passwords is a risky habit. (a) False (b) True
8. 8.🔺 In the V-I-R triangle, how do we find V? (a) V = I + R (b) V = I ÷ R (c) V = R ÷ I (d) V = I × R
9. 9.📏 How many kilowatts (kW) is 4450 W? =
10. 10.Which of these usually has a microcontroller inside? (a) a digital thermometer (b) a spinning top (c) a wind-up toy (d) a hand pump
11. 11.🌈 In the resistor colour code, which number does brown stand for?
12. 12.🔌 Is a rubber band a conductor or an insulator? (a) an insulator (b) a conductor
13. 13.Which of these is measured in ohms (Ω)? (a) the push of a cell (b) resistance (c) power (d) energy used each second
14. 14.🔍 Which is the odd one out? (a) an exhaust fan (b) a rice cooker (c) a toaster (d) an electric iron
15. 15.True or false: a laptop uses very little power. (a) True (b) False
16. 16.🔺 A 10 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
17. 17.🔢 To plan an electronics project, what comes right after “draw the circuit diagram”? (a) list inputs and outputs (b) test it and fix it (c) pick a problem to solve (d) build it with an adult
18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
19. 19.🤖 “if (A AND B)” is true when … (a) only B is true (b) both A and B are true (c) only A is true (d) both are false
20. 20.💡 5 identical bulbs are joined in series with a 5 V battery (ideal wires). How many volts does each bulb get? =
21. 21.⚡ What does a night lamp mainly change electricity into? (a) light (b) heat (c) sound (d) movement
22. 22.Which of these is safe? (a) climb an electric pole (b) throw cells in a fire (c) build with an adult near (d) touch a fallen wire
23. 23.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) to make it colourful (c) to hide the circuit (d) symbols are heavier
24. 24.🔌 Most metals are good … (a) insulators (b) magnets only (c) batteries (d) conductors
25. 25.Which of these usually has a microcontroller inside? (a) a wind-up toy (b) a spinning top (c) a smart watch (d) a candle
26. 26.🔌 Which part of a screwdriver should an electrician hold? (a) the metal tip (b) the plastic handle (c) the bare end (d) the steel shaft
27. 27.🔺 A current of 0.5 A flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
28. 28.🔍 Which is the odd one out? (a) accept every permission (b) share camera links (c) change default passwords (d) keep factory passwords
29. 29.True or false: two equal parallel lines is the symbol for a capacitor. (a) True (b) False
30. 30.🤖 Does a TV remote usually have a microcontroller inside? (a) Yes (b) No
31. 31.True or false: a laptop needs much more power. (a) True (b) False
32. 32.📏 How many kilo-ohms (kΩ) is 5200 Ω? =
33. 33.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) True (b) False
34. 34.Which of these is safe? (a) poke things in a socket (b) fly kites in open fields (c) use mains for a project (d) climb an electric pole
35. 35.🔌 Is a copper wire a conductor or an insulator? (a) a conductor (b) an insulator
36. 36.Which of these is a risky habit? (a) cover unused cameras (b) share only needed data (c) share the Wi-Fi key (d) set up with a parent
37. 37.What does the phone app do? (a) acts on a command (b) shows data to you (c) stores data online (d) reads values, decides
38. 38.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put aluminium foil across the gap. Does the bulb glow? (a) Yes (b) No
39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
40. 40.True or false: an electric kettle mainly gives out light. (a) False (b) True

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