Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 718 · 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 circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
2. 2.True or false: a circle with M inside is the symbol for a diode. (a) False (b) True
3. 3.True or false: a circle with A inside is the symbol for an ammeter. (a) True (b) False
4. 4.True or false: a thermistor smooths a wobbly supply. (a) True (b) False
5. 5.💡 A red LED (it uses 2 V) is joined with a 300 Ω resistor to an 8 V supply. What current flows (in mA)?
6. 6.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a plastic ruler. Does the bulb glow? (a) Yes (b) No
7. 7.🔘 Which kind of switch works only while pressed? (a) a slide switch (b) a toggle switch (c) a reed switch (d) a push button
8. 8.⚠️ Is it safe to use mains for a project? (a) not safe (b) safe
9. 9.Which of these is a conductor? (a) a wooden stick (b) a dry cork (c) a brass key (d) a paper strip
10. 10.🔍 Which is the odd one out? (a) a toaster (b) a night lamp (c) a traffic signal (d) a tube light
11. 11.🔁 total = 0
    for i = 1 to 11 { total = total + i }
    What is total at the end?
12. 12.Which of these is the process? (a) an alert on the phone (b) decide if soil is dry (c) a light level reading (d) the pump turns on
13. 13.True or false: “a button press” is the output. (a) True (b) False
14. 14.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.⏱️ repeat 8 times { buzzer ON; wait 500 ms; buzzer OFF; wait 100 ms }
    How many milliseconds does this take in all?
16. 16.What does a buzzer do? (a) has coloured bands (b) is a resistance knob (c) glows using little power (d) makes a beeping sound
17. 17.Which of these is measured in volts (V)? (a) resistance (b) current (c) how much a part resists (d) voltage
18. 18.🔘 A cell and a bulb are joined to 3 side-by-side paths with one switch on each path — A, B and C (parallel). A is ON, B is OFF and C is ON. Does the bulb glow? (a) No (b) Yes
19. 19.True or false: a laptop has no screen of its own. (a) False (b) True
20. 20.🔢 To plan an electronics project, what comes right after “pick a problem to solve”? (a) test it and fix it (b) draw the circuit diagram (c) list inputs and outputs (d) build it with an adult
21. 21.⏱️ repeat 4 times { buzzer ON; wait 400 ms; buzzer OFF; wait 200 ms }
    How many milliseconds does this take in all?
22. 22.🔋 6 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)? =
23. 23.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
24. 24.🤖 Does a smart watch usually have a microcontroller inside? (a) No (b) Yes
25. 25.🔐 Privacy for a smart device means controlling … (a) its colour (b) who can see your data (c) its battery size (d) how loud it beeps
26. 26.True or false: “a break stops every bulb” is true of a series circuit. (a) False (b) True
27. 27.What does a thermistor do? (a) senses how hot it is (b) lets current go one way (c) is a resistance knob (d) boosts a small signal
28. 28.🔺 In the V-I-R triangle, how do we find V? (a) V = I + R (b) V = I × R (c) V = I ÷ R (d) V = R ÷ I
29. 29.⏱️ How many milliseconds is a wait of 4.5 seconds?
30. 30.💡 2 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
31. 31.True or false: to read app permissions is a good habit. (a) True (b) False
32. 32.🧭 Which part of a microcontroller board keeps the voltage steady? (a) the pins (b) the power LED (c) the voltage regulator (d) the reset button
33. 33.🔺 A current of 3 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
34. 34.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
35. 35.🔋 Cells joined + to − in a row (series) give … (a) the same voltage (b) no voltage (c) a bigger voltage (d) a smaller voltage
36. 36.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
38. 38.🧮 Adding another resistor in series makes the total resistance … (a) bigger (b) stay the same (c) zero (d) smaller
39. 39.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
40. 40.True or false: a reed switch closes when tipped over. (a) True (b) False

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