Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 162 · 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 gap of dry air between two wires acts as … (a) a conductor (b) a cell (c) a switch that is ON (d) an insulator
2. 2.True or false: “own switch for each bulb” is true of a parallel circuit. (a) False (b) True
3. 3.📏 How many kilowatts (kW) is 1400 W? =
4. 4.🔁 count = 9
   repeat 2 times { count = count + 6 }
   What is count at the end?
5. 5.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
6. 6.🔋 What is a battery? (a) a kind of bulb (b) a switch with a lid (c) one single wire (d) two or more cells joined
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
8. 8.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
9. 9.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 800 ms }
   How many times does the LED blink in 6 seconds?
10. 10.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) a sound sensor (d) a temperature sensor
11. 11.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
12. 12.Which of these is measured in ohms (Ω)? (a) the push of a cell (b) current (c) how much a part resists (d) energy used each second
13. 13.🔺 A current of 10 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
14. 14.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
15. 15.⚡ What does an electric drill mainly change electricity into? (a) heat (b) movement (c) sound (d) light
16. 16.📶 On a 5 V board, a pin set HIGH gives about … (a) 5 V (b) 50 V (c) 230 V (d) 0 V
17. 17.⏱️ How many milliseconds is a wait of 3.4 seconds?
18. 18.True or false: the push of a cell is measured in volts (V). (a) False (b) True
19. 19.📏 Voltmeter or ammeter: which one is joined across a part? (a) ammeter (b) voltmeter
20. 20.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are ON (b) only when both are OFF (c) never (d) when either is ON
21. 21.🤖 “if (A AND B)” is true when … (a) both A and B are true (b) only A is true (c) only B is true (d) both are false
22. 22.True or false: to use daylight to read saves electricity. (a) False (b) True
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.🔐 Is it a good or a risky habit to set a strong password? (a) risky habit (b) good habit
25. 25.🔁 total = 0
    for i = 1 to 5 { total = total + i }
    What is total at the end?
26. 26.🔍 Which is the odd one out? (a) a mixer grinder (b) an exhaust fan (c) an electric toy car (d) a torch
27. 27.⚡ What does an electric iron mainly change electricity into? (a) movement (b) light (c) heat (d) sound
28. 28.Which of these is a good habit? (a) ignore update messages (b) tap unknown app links (c) set a strong password (d) share the Wi-Fi key
29. 29.True or false: if a cell is taken out, the circuit is open and no current flows. (a) False (b) True
30. 30.True or false: “one out, the rest glow” is true of a parallel circuit. (a) True (b) False
31. 31.What does a thermistor do? (a) lets current go one way (b) makes things spin (c) senses how bright it is (d) senses how hot it is
32. 32.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 47. What happens? (a) red LED ON (b) green LED ON
33. 33.True or false: if the switch is ON, the circuit is closed and current flows. (a) False (b) True
34. 34.🔺 A current of 0.25 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
35. 35.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
36. 36.💡 5 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 4 and 5 are taken out of their holders. Does bulb 1 glow? (a) Yes (b) No
37. 37.💡 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
38. 38.⏱️ loop forever { LED ON; wait 100 ms; LED OFF; wait 100 ms }
    How many times does the LED blink in 9 seconds?
39. 39.🔺 A current of 50 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
40. 40.🔁 count = 9
    repeat 7 times { count = count + 6 }
    What is count at the end?

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