Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 184 · 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.💡 2 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
2. 2.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
3. 3.🔌 Is a steel spoon a conductor or an insulator? (a) a conductor (b) an insulator
4. 4.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
5. 5.🔺 A current of 40 mA flows when 18.8 V is joined across a resistor. What is its resistance (in ohms)?
6. 6.Which drawing is the symbol for a junction? (a) a long and a short line (b) a circle with A inside (c) a dot where wires meet (d) one tall, one short bar
7. 7.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 10 (c) 60 (d) 1000
8. 8.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
9. 9.🔍 Which is the odd one out? (a) an app-controlled bulb (b) a fitness band with app (c) a battery torch (d) a Wi-Fi smart plug
10. 10.🔍 Which is the odd one out? (a) decide if soil is dry (b) count button presses (c) a temperature reading (d) compare with a limit
11. 11.🔁 count = 6
    repeat 7 times { count = count + 2 }
    What is count at the end?
12. 12.🌈 A resistor has the colour bands green, red, orange. What is its value in kilo-ohms (kΩ)? =
13. 13.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed
14. 14.🔺 A current of 20 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
15. 15.🧮 A 1.5 V battery is joined to 2 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
16. 16.🌈 In the resistor colour code, which number does grey stand for?
17. 17.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
18. 18.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True
19. 19.🔌 Is aluminium foil a conductor or an insulator? (a) a conductor (b) an insulator
20. 20.True or false: an LED glows using little power. (a) False (b) True
21. 21.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) True (b) False
22. 22.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a diode (c) a capacitor (d) a buzzer
23. 23.True or false: “HIGH or LOW only” is a digital signal. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) the fan starts (b) a buzzer beeps (c) the pump turns on (d) count button presses
25. 25.🧮 A 22 Ω resistor is joined in series with two equal 1000 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
26. 26.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = V × I (d) P = I ÷ V
27. 27.🔋 Does a cell give electricity or use electricity? (a) uses electricity (b) gives electricity
28. 28.🔍 Which is the odd one out? (a) fly a kite near wires (b) dry your hands first (c) climb an electric pole (d) poke things in a socket
29. 29.Which of these means the circuit is closed? (a) the loop is complete (b) the bulb is unscrewed (c) a cell is taken out (d) the switch is OFF
30. 30.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
31. 31.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 8 seconds?
32. 32.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they explode (c) they keep glowing (d) they all go out
33. 33.🌈 A resistor has the colour bands grey, blue, brown. What is its value (in ohms)?
34. 34.🔍 Which is the odd one out? (a) post your live location (b) ignore update messages (c) cover unused cameras (d) tap unknown app links
35. 35.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
36. 36.🌈 A resistor has the colour bands red, black, black. What is its value (in ohms)?
37. 37.🔺 A current of 20 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
38. 38.📏 How many milliamperes (mA) is 1.02 A?
39. 39.Which of these means the circuit is open? (a) the switch is ON (b) all wires are joined (c) the loop is complete (d) a wire has come loose
40. 40.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. How many bulbs glow?

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