Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 812 · 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.🤖 “if (A AND B)” is true when … (a) both are false (b) both A and B are true (c) only A is true (d) only B is true
2. 2.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) smaller (c) bigger (d) zero
3. 3.True or false: a diode lets current go one way. (a) True (b) False
4. 4.⏱️ repeat 8 times { buzzer ON; wait 500 ms; buzzer OFF; wait 200 ms }
   How many milliseconds does this take in all?
5. 5.📏 How many ohms make 1 kilo-ohm (kΩ)? (a) 100 (b) 1024 (c) 10 (d) 1000
6. 6.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) chemical energy (b) light energy (c) sound energy (d) movement energy
7. 7.🔢 To plan an electronics project, which is the FIRST step? (a) draw the circuit diagram (b) pick a problem to solve (c) list inputs and outputs (d) build it with an adult
8. 8.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open
9. 9.True or false: a spinning top has no microcontroller inside. (a) False (b) True
10. 10.Which of these is true of a series circuit? (a) own switch for each bulb (b) one out, the rest glow (c) used in house wiring (d) a single current path
11. 11.🔍 Which is the odd one out? (a) a ceramic cup (b) a graphite rod (c) a metal paper clip (d) a steel coin
12. 12.✏️ In a circuit diagram, which part is drawn as a straight line? (a) switch (b) wire (c) capacitor (d) motor
13. 13.True or false: to leave fridge door open wastes electricity. (a) True (b) False
14. 14.🧩 Which component is a resistance knob? (a) fuse (b) transistor (c) potentiometer (d) buzzer
15. 15.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
16. 16.✏️ In a cell symbol, which line is the + terminal? (a) neither line (b) both lines (c) the longer line (d) the shorter line
17. 17.🔋 3 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
18. 18.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) blinks 500 times (c) pauses for half a second (d) turns the LED off
19. 19.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
20. 20.💡 5 identical bulbs are joined in series with a 7.5 V battery (ideal wires). How many volts does each bulb get? =
21. 21.Which of these is true of a series circuit? (a) used in house wiring (b) each gets the full volts (c) many paths for current (d) a break stops every bulb
22. 22.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
23. 23.🧮 A 3.6 V battery is joined to 8 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
24. 24.🔐 Which is the strongest password for a home smart camera? (a) password (b) Tiger#Lamp42!Moon (c) admin (d) 123456
25. 25.💡 A blue LED uses 3 V and should get 10 mA. It runs from a 9 V supply. What resistor (in ohms) is needed in series?
26. 26.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
27. 27.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 100 (c) 60 (d) 1000
28. 28.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
29. 29.🌈 A resistor has the colour bands brown, white, black. What is its value (in ohms)?
30. 30.Which of these means the circuit is open? (a) the switch is OFF (b) the switch is ON (c) the loop is complete (d) all wires are joined
31. 31.🌈 In the resistor colour code, which number does violet stand for?
32. 32.Which of these is the input? (a) an alert on the phone (b) a soil moisture reading (c) the pump turns on (d) check if temp > 30
33. 33.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
34. 34.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
35. 35.🏠 Which is a smart-home example? (a) a candle in a jar (b) a printed map (c) lights on from an app (d) a hand fan
36. 36.True or false: a microcontroller has a built-in keyboard. (a) False (b) True
37. 37.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a dry cork across the gap. Does the bulb glow? (a) No (b) Yes
38. 38.True or false: to touch a switch when wet is safe. (a) False (b) True
39. 39.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
40. 40.🌈 A resistor has the colour bands red, black, brown. What is its value (in ohms)?

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