Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 221 · 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.🔘 When a switch is ON, the circuit is … (a) open (b) closed (c) broken (d) cut
2. 2.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a rain sensor (c) a motion sensor (d) a temperature sensor
3. 3.True or false: a capacitor stores a little charge. (a) False (b) True
4. 4.⚡ What does a water heater mainly change electricity into? (a) light (b) heat (c) movement (d) sound
5. 5.🌐 In an IoT system, which part reads values, decides? (a) actuator (b) sensor (c) microcontroller (d) Wi-Fi
6. 6.True or false: to share camera links is a risky habit. (a) True (b) False
7. 7.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 6 glow? (a) Yes (b) No
8. 8.Which of these is an insulator? (a) a safety pin (b) aluminium foil (c) a cotton thread (d) a copper wire
9. 9.⚠️ Is it safe to fly a kite near wires? (a) safe (b) not safe
10. 10.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
11. 11.📏 How many amperes (A) is 2130 mA? =
12. 12.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) their sum (c) less than either one (d) always zero
13. 13.🔗 Series or parallel circuit: “used in house wiring”? (a) series (b) parallel
14. 14.🌐 What does IoT stand for? (a) Inside of Toys (b) Internet of Talk (c) Internet of Things (d) Input of Tools
15. 15.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
16. 16.What does an LED do? (a) glows using little power (b) lets current go one way (c) has coloured bands (d) is a resistance knob
17. 17.What does the sensor do? (a) carries the data (b) stores data online (c) measures the real world (d) shows data to you
18. 18.🔍 Which is the odd one out? (a) an LED (b) a push button (c) a servo motor (d) a speaker
19. 19.✏️ In a circuit diagram, which part is drawn as triangle, bar and arrows? (a) LED (b) diode (c) wire (d) switch
20. 20.🤖 “if (A AND B)” is true when … (a) both are false (b) only B is true (c) only A is true (d) both A and B are true
21. 21.True or false: an electric iron mainly makes movement. (a) False (b) True
22. 22.🔋 8 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.🧩 Which part changes electrical energy into movement? (a) a resistor (b) a motor (c) a fuse (d) an LED
24. 24.⏱️ A program says “wait 8500 ms”. How many seconds is that? =
25. 25.⚡ Which formula gives electric power? (a) P = V × I (b) P = V ÷ I (c) P = V + I (d) P = I ÷ V
26. 26.🤖 How does a new program get onto a microcontroller board? (a) drawn with a pen (b) sent by sound (c) uploaded over USB (d) typed on the chip
27. 27.Which of these is an input? (a) a buzzer (b) a servo motor (c) a turning knob (d) a speaker
28. 28.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
29. 29.What does a thermistor do? (a) makes things spin (b) limits the current (c) stores a little charge (d) senses how hot it is
30. 30.True or false: many long-short pairs is the symbol for a battery. (a) True (b) False
31. 31.🧮 A 9 V battery is joined to 12 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
32. 32.🔋 Does a washing machine give electricity or use electricity? (a) gives electricity (b) uses electricity
33. 33.🌈 A resistor has the colour bands green, blue, yellow. What is its value in kilo-ohms (kΩ)? =
34. 34.🔍 Which is the odd one out? (a) set a strong password (b) log out of shared phones (c) post your live location (d) change default passwords
35. 35.🧮 Resistors of 33 Ω, 470 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
36. 36.True or false: a laptop needs much more power. (a) True (b) False
37. 37.🌐 Is a wind-up clock an IoT device? (a) not an IoT device (b) an IoT device
38. 38.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
39. 39.🔋 How many 3 V cells must be joined in series to give 9 V?
40. 40.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) battery (b) capacitor (c) diode (d) ammeter

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