Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 522 · 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.🔋 5 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)? =
2. 2.🔁 Is the circuit closed or open if the switch is ON? (a) closed (b) open
3. 3.True or false: “the pump turns on” is the output. (a) False (b) True
4. 4.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) both lines (d) the longer line
5. 5.🌐 A soil sensor sends a reading to an app every 5 minutes. How many readings arrive in 1 hour?
6. 6.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a program (d) a battery
7. 7.True or false: to dry your hands first is not safe. (a) False (b) True
8. 8.✏️ In a circuit diagram, which part is drawn as a line lifted at a gap? (a) diode (b) switch (c) resistor (d) battery
9. 9.🔍 Which is the odd one out? (a) use a cable with cuts (b) poke things in a socket (c) use small battery cells (d) throw cells in a fire
10. 10.🔺 A current of 25 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
11. 11.🧮 A 6 V battery is joined to 10 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
12. 12.Which of these is the input? (a) count button presses (b) the pump turns on (c) a button press (d) an alert on the phone
13. 13.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = I ÷ V (d) P = V + I
14. 14.🔘 Which kind of switch stays where you flip it? (a) a push button (b) a reed switch (c) a toggle switch (d) a tilt switch
15. 15.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a brass key across the gap. Does the bulb glow? (a) No (b) Yes
16. 16.📶 A pin set LOW gives about … (a) 0 V (b) 5 V (c) 9 V (d) 1.5 V
17. 17.🌈 A resistor has the colour bands green, white, black. What is its value (in ohms)?
18. 18.Which of these uses electricity? (a) a wind turbine (b) a bicycle dynamo (c) an air conditioner (d) a solar panel
19. 19.True or false: a hand pump usually has a microcontroller inside. (a) False (b) True
20. 20.True or false: an electric kettle mainly makes movement. (a) False (b) True
21. 21.Which of these is measured in watts (W)? (a) the push of a cell (b) the flow of charge (c) current (d) energy used each second
22. 22.🔍 Which is the odd one out? (a) a motion sensor signal (b) a temperature reading (c) a soil moisture reading (d) the fan starts
23. 23.True or false: a wind-up toy usually has a microcontroller inside. (a) False (b) True
24. 24.🔐 Is it a good or a risky habit to keep factory passwords? (a) good habit (b) risky habit
25. 25.🔢 To plan an electronics project, which is the LAST step? (a) build it with an adult (b) list inputs and outputs (c) test it and fix it (d) pick a problem to solve
26. 26.🔘 Which kind of switch flips up or down? (a) a push button (b) a reed switch (c) a tilt switch (d) a toggle switch
27. 27.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
28. 28.🔁 count = 4
    repeat 5 times { count = count + 10 }
    What is count at the end?
29. 29.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 320 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
30. 30.🔋 4 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
31. 31.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
32. 32.🔍 Which is the odd one out? (a) a push button (b) a temperature sensor (c) a sound sensor (d) an LED
33. 33.🧩 A capacitor in a circuit can … (a) make light (b) spin a wheel (c) store charge briefly (d) measure heat
34. 34.True or false: power is measured in watts (W). (a) True (b) False
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
36. 36.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🔌 Which metal is used for most electric wires at home? (a) glass (b) copper (c) plastic (d) rubber
38. 38.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) energy used each second (d) the length of a wire
39. 39.🔺 A current of 50 mA flows when 7.5 V is joined across a resistor. What is its resistance (in ohms)?
40. 40.True or false: on a cell, “usually the red wire” means the + (positive) end. (a) True (b) False

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