Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 96 · 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.🔁 count = 9
   repeat 7 times { count = count + 4 }
   What is count at the end?
2. 2.🤖 if (sound > 60) { red LED ON } else { green LED ON }
   The sound sensor reads 70. What happens? (a) green LED ON (b) red LED ON
3. 3.True or false: a ceiling fan mainly makes movement. (a) False (b) True
4. 4.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
5. 5.🔍 Which is the odd one out? (a) throw cells in a fire (b) poke things in a socket (c) stay away from pylons (d) use mains for a project
6. 6.Which of these usually has a microcontroller inside? (a) a spinning top (b) a candle (c) a digital alarm clock (d) a wind-up toy
7. 7.📏 Which unit measures power? (a) volt (V) (b) ampere (A) (c) ohm (Ω) (d) watt (W)
8. 8.🔁 What does “count = count + 1” do? (a) prints 1 (b) sets count to 1 (c) adds 1 to count (d) takes 1 away
9. 9.What does a toggle switch do? (a) springs back when let go (b) closes when tipped over (c) closes near a magnet (d) flips up or down
10. 10.True or false: to share only needed data is a good habit. (a) False (b) True
11. 11.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the process (b) the battery (c) the input (d) the output
12. 12.What does a motor do? (a) boosts a small signal (b) blows if current is high (c) makes things spin (d) stores a little charge
13. 13.True or false: a steel coin is a conductor. (a) True (b) False
14. 14.⏱️ repeat 7 times { buzzer ON; wait 200 ms; buzzer OFF; wait 400 ms }
    How many milliseconds does this take in all?
15. 15.🧮 Resistors of 22 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
16. 16.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) junction (b) motor (c) resistor (d) switch
17. 17.Which of these mainly gives out light? (a) an LED lamp (b) a school bell (c) a buzzer (d) an electric iron
18. 18.Which of these is a conductor? (a) a plastic ruler (b) a wooden stick (c) a graphite rod (d) a plastic straw
19. 19.Which job is done by the reset button? (a) brings power and code (b) runs the program (c) keeps the voltage steady (d) restarts the program
20. 20.🤖 “if (A AND B)” is true when … (a) only A is true (b) both A and B are true (c) both are false (d) only B is true
21. 21.🔺 A current of 0.5 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
22. 22.🔘 Two switches are in series. When does the bulb glow? (a) when both are OFF (b) never (c) when both are ON (d) when either is ON
23. 23.🔁 count = 2
    repeat 7 times { count = count + 7 }
    What is count at the end?
24. 24.🔁 x = 1
    repeat 2 times { x = x × 2 }
    What is x at the end?
25. 25.🧮 Resistors of 150 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
26. 26.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is ON and C is ON. Does the bulb glow? (a) Yes (b) No
27. 27.🔺 A current of 2 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
28. 28.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
29. 29.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 10 (c) 100 (d) 60
30. 30.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
31. 31.🔗 Series or parallel circuit: “used in house wiring”? (a) parallel (b) series
32. 32.📏 Which unit measures the flow of charge? (a) volt (V) (b) watt (W) (c) ohm (Ω) (d) ampere (A)
33. 33.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) bigger (c) stay the same (d) zero
34. 34.🤖 if (light < 400) { lamp ON } else { lamp OFF }
    The light sensor reads 537. What happens? (a) lamp ON (b) lamp OFF
35. 35.True or false: a motor turns a fan or wheels. (a) False (b) True
36. 36.🔋 3 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
37. 37.True or false: the ammeter measures voltage. (a) False (b) True
38. 38.⚠️ Is it safe to take cells out after use? (a) safe (b) not safe
39. 39.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 22 °C. What is shown? (a) Hot (b) Cool (c) Warm
40. 40.🔍 Which is the odd one out? (a) an exhaust fan (b) an electric drill (c) a traffic signal (d) a ceiling fan

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