Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 269 · 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.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 340 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
2. 2.⏱️ A program says “wait 1250 ms”. How many seconds is that? =
3. 3.🤖 “if (A AND B)” is true when … (a) only B is true (b) both are false (c) only A is true (d) both A and B are true
4. 4.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) none (c) both of them (d) only one
5. 5.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the colour of light (d) the length of a wire
6. 6.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a servo motor (c) a motor (d) a buzzer
7. 7.💡 Why is house wiring done in parallel? (a) each gets full voltage (b) to save copper only (c) so all go off together (d) to make bulbs dim
8. 8.🧩 Which component senses how hot it is? (a) thermistor (b) capacitor (c) buzzer (d) motor
9. 9.🔢 To plan an electronics project, what comes right after “pick a problem to solve”? (a) build it with an adult (b) test it and fix it (c) list inputs and outputs (d) draw the circuit diagram
10. 10.True or false: the voltmeter measures current. (a) True (b) False
11. 11.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) True (b) False
12. 12.🔋 Does a mobile phone give electricity or use electricity? (a) uses electricity (b) gives electricity
13. 13.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
14. 14.What does a fuse do? (a) turns a fan or wheels (b) makes things spin (c) blows if current is high (d) makes a beeping sound
15. 15.True or false: to tap unknown app links is a risky habit. (a) True (b) False
16. 16.True or false: a TV remote has no microcontroller inside. (a) False (b) True
17. 17.🔁 What does a variable do in a program? (a) joins two wires (b) measures light (c) stores a value (d) blinks an LED
18. 18.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
19. 19.🧩 Which part changes electrical energy into movement? (a) a motor (b) a fuse (c) a resistor (d) an LED
20. 20.🔋 Does a bicycle dynamo give electricity or use electricity? (a) uses electricity (b) gives electricity
21. 21.💡 4 identical bulbs are joined in series with a 10 V battery (ideal wires). How many volts does each bulb get? =
22. 22.🔘 When a switch is ON, the circuit is … (a) open (b) closed (c) broken (d) cut
23. 23.🔍 Which is the odd one out? (a) the pump turns on (b) the fan starts (c) count button presses (d) an alert on the phone
24. 24.Which of these is measured in watts (W)? (a) the push of a cell (b) how much a part resists (c) voltage (d) energy used each second
25. 25.True or false: a push button flips up or down. (a) True (b) False
26. 26.🧮 Resistors of 150 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
27. 27.💡 A red LED (it uses 2 V) is joined with a 100 Ω resistor to a 3.5 V supply. What current flows (in mA)?
28. 28.⚡ What do we call a flow of electric charge through a wire? (a) electric current (b) friction (c) a magnet (d) sound
29. 29.Which of these is an IoT device? (a) a plain wall switch (b) a pencil sharpener (c) a plain table fan (d) an app-controlled bulb
30. 30.🔋 Does a cell give electricity or use electricity? (a) uses electricity (b) gives electricity
31. 31.Which of these is a conductor? (a) a wooden stick (b) a metal paper clip (c) a rubber band (d) a glass marble
32. 32.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
33. 33.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
34. 34.Which drawing is the symbol for a switch? (a) a long and a short line (b) a line lifted at a gap (c) triangle, bar and arrows (d) one tall, one short bar
35. 35.💡 An LED is joined to a 5 V battery through a 470 Ω resistor; its long leg goes to the + side and its short leg to the − side. What happens? (a) may burn out (b) does not light (c) lights up
36. 36.📏 Voltmeter or ammeter: which one measures current? (a) ammeter (b) voltmeter
37. 37.True or false: “used in house wiring” is true of a series circuit. (a) False (b) True
38. 38.🌈 In the resistor colour code, which number does white stand for?
39. 39.True or false: to share only needed data is a risky habit. (a) False (b) True
40. 40.🗺️ In an input → process → output plan, is “a button press” the input, the process or the output? (a) input (b) output (c) process

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