Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 234 · 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.Which of these is a conductor? (a) a cotton thread (b) a plastic straw (c) a steel coin (d) a glass marble
2. 2.True or false: a copper wire is a conductor. (a) False (b) True
3. 3.🔺 A 1.2 V supply is joined across a 120 Ω resistor. What current flows (in milliamperes, mA)?
4. 4.🧮 Four equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
5. 5.✏️ In a circuit diagram, wires are usually drawn as … (a) little stars (b) dotted circles (c) straight lines (d) wavy lines
6. 6.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) a cell is taken out (c) the loop is complete (d) the switch is OFF
7. 7.True or false: “a break stops every bulb” is true of a series circuit. (a) True (b) False
8. 8.⏱️ How many milliseconds is a wait of 2.3 seconds?
9. 9.Which of these uses electricity? (a) a washing machine (b) a solar panel (c) a bicycle dynamo (d) a wind turbine
10. 10.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is OFF, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
11. 11.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a light sensor (c) a motion sensor (d) a gas sensor
12. 12.Which drawing is the symbol for a voltmeter? (a) a small empty box (b) a long and a short line (c) a circle with V inside (d) triangle, bar and arrows
13. 13.📏 Voltmeter or ammeter: which one is joined across a part? (a) ammeter (b) voltmeter
14. 14.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
15. 15.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 1000 (c) 60 (d) 100
16. 16.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
17. 17.🔍 Which is the odd one out? (a) a wooden stick (b) a plastic straw (c) a safety pin (d) a paper strip
18. 18.🔁 repeat 6 times { repeat 3 times { beep } }
    How many beeps are there?
19. 19.True or false: a resistor senses how hot it is. (a) False (b) True
20. 20.Which of these uses electricity? (a) a wind turbine (b) a power station (c) a cell (d) a refrigerator
21. 21.Which of these is a conductor? (a) an iron nail (b) a cotton thread (c) a paper strip (d) a rubber eraser
22. 22.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = V × I (d) P = I ÷ V
23. 23.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
24. 24.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
25. 25.What does a diode do? (a) has coloured bands (b) lets current go one way (c) turns a fan or wheels (d) senses how bright it is
26. 26.🔘 What does a switch do in a circuit? (a) stores current (b) opens or closes the loop (c) makes electricity (d) changes the voltage
27. 27.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) by Wi-Fi (c) in series (d) in parallel
28. 28.Which drawing is the symbol for a bulb? (a) two or more cell symbols (b) two equal parallel lines (c) one tall, one short bar (d) a circle with an X in it
29. 29.Which drawing is the symbol for a diode? (a) a circle with A inside (b) a long and a short line (c) triangle against a bar (d) a circle with V inside
30. 30.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 3 glow? (a) Yes (b) No
31. 31.🔌 Is a graphite rod a conductor or an insulator? (a) an insulator (b) a conductor
32. 32.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is OFF, B is ON, C is OFF and D is ON. Does the bulb glow? (a) Yes (b) No
33. 33.🧭 Which part of a microcontroller board shows the board is on? (a) the voltage regulator (b) the power LED (c) the USB port (d) the pins
34. 34.🔐 A smart-camera app asks for your school name and home address. What should you do? (a) type it all in (b) share it with friends (c) ask a parent first (d) post it online
35. 35.Which of these mainly makes sound? (a) a school bell (b) an LED lamp (c) a tube light (d) a traffic signal
36. 36.💡 What does LED stand for? (a) large electric dial (b) low energy device (c) light energy dial (d) light-emitting diode
37. 37.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) half the voltage (c) double the voltage (d) no voltage
38. 38.What does a transistor do? (a) boosts a small signal (b) smooths a wobbly supply (c) is a resistance knob (d) turns a fan or wheels
39. 39.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
40. 40.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a display (c) a motor (d) an LED

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