Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 573 · 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.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the glass (b) the base (c) the filament (d) the switch
2. 2.🔁 count = 0
   repeat 3 times { count = count + 2 }
   What is count at the end?
3. 3.🔐 Is it a good or a risky habit to set a strong password? (a) risky habit (b) good habit
4. 4.🌐 Is a Wi-Fi doorbell camera an IoT device? (a) not an IoT device (b) an IoT device
5. 5.Which job needs a sound sensor? (a) keep an incubator warm (b) water a dry plant (c) measure classroom noise (d) spot someone walking in
6. 6.🔐 Is it a good or a risky habit to read app permissions? (a) risky habit (b) good habit
7. 7.True or false: an LED lets current go one way. (a) True (b) False
8. 8.True or false: on a cell, “the flat end” means the − (negative) end. (a) True (b) False
9. 9.🌈 A resistor has the colour bands brown, red, red. What is its value (in ohms)?
10. 10.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) ammeter (b) bulb (c) motor (d) capacitor
11. 11.True or false: the voltmeter is joined across a part. (a) True (b) False
12. 12.🔺 A current of 3 A flows when 60 V is joined across a resistor. What is its resistance (in ohms)?
13. 13.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) zero (c) bigger (d) smaller
14. 14.🔁 What does a variable do in a program? (a) blinks an LED (b) joins two wires (c) stores a value (d) measures light
15. 15.💡 4 identical bulbs are joined in parallel across a 6 V battery (ideal wires). How many volts does each bulb get? =
16. 16.🌈 A resistor has the colour bands green, blue, red. What is its value in kilo-ohms (kΩ)? =
17. 17.🔍 Which is the odd one out? (a) a plastic straw (b) aluminium foil (c) a graphite rod (d) an iron nail
18. 18.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
19. 19.🧮 A 3 V battery is joined to 2 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
20. 20.💡 2 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 2 glow? (a) Yes (b) No
21. 21.🔋 How many 1.5 V cells must be joined in series to give 6 V?
22. 22.🔍 Which is the odd one out? (a) the fan starts (b) an alert on the phone (c) the pump turns on (d) a light level reading
23. 23.Which of these usually has a microcontroller inside? (a) a spinning top (b) a plain wall switch (c) a candle (d) a digital alarm clock
24. 24.🔺 A current of 0.5 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
25. 25.Which of these means the circuit is closed? (a) all wires are joined (b) the switch is OFF (c) a wire has come loose (d) a cell is taken out
26. 26.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
27. 27.📏 Which unit measures energy used each second? (a) ohm (Ω) (b) volt (V) (c) ampere (A) (d) watt (W)
28. 28.Which job needs a light sensor? (a) start a fan when hot (b) spot someone walking in (c) open blinds at sunrise (d) keep an incubator warm
29. 29.Which of these is an input? (a) a water pump (b) a temperature sensor (c) a small display (d) a speaker
30. 30.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
31. 31.Which of these is safe? (a) fly a kite near wires (b) use a cable with cuts (c) stop if a part gets hot (d) touch a switch when wet
32. 32.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
33. 33.True or false: a resistor limits the current. (a) False (b) True
34. 34.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the battery (b) the output (c) the input (d) the process
35. 35.True or false: on an LED, the longer leg is the cathode (−). (a) True (b) False
36. 36.🔺 A current of 1 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
37. 37.🌐 How does a home IoT device usually send its data to the app? (a) over Wi-Fi (b) by post (c) through a candle (d) by shouting
38. 38.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 25 °C. What is shown? (a) Cool (b) Hot (c) Warm
39. 39.🔋 4 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
40. 40.True or false: a long and a short line is the symbol for a voltmeter. (a) False (b) True

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