Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 89 · 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 tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a wooden stick across the gap. Does the bulb glow? (a) Yes (b) No
2. 2.True or false: a dot where wires meet is the symbol for a bulb. (a) False (b) True
3. 3.✏️ In a circuit diagram, which part is drawn as a line lifted at a gap? (a) bulb (b) wire (c) switch (d) battery
4. 4.True or false: to water a dry plant, use a gas sensor. (a) False (b) True
5. 5.🧮 Three equal 30 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
6. 6.True or false: “a single current path” is true of a series circuit. (a) True (b) False
7. 7.🌐 Is a battery torch an IoT device? (a) not an IoT device (b) an IoT device
8. 8.🔺 A current of 10 mA flows when 4 V is joined across a resistor. What is its resistance (in ohms)?
9. 9.🔺 A current of 25 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
10. 10.🔍 Which is the odd one out? (a) ignore update messages (b) accept every permission (c) post your live location (d) set a strong password
11. 11.🔁 count = 6
    repeat 6 times { count = count + 7 }
    What is count at the end?
12. 12.True or false: a torch mainly gives out light. (a) True (b) False
13. 13.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) output (b) input (c) process
14. 14.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 9 seconds?
15. 15.True or false: a straight line is the symbol for a wire. (a) True (b) False
16. 16.🔁 repeat 2 times { repeat 5 times { beep } }
    How many beeps are there?
17. 17.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
18. 18.🔺 A current of 25 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
19. 19.🧮 Resistors of 150 Ω, 47 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
20. 20.Which of these is a good habit? (a) tap unknown app links (b) keep factory passwords (c) share only needed data (d) ignore update messages
21. 21.True or false: to use mains for a project is not safe. (a) True (b) False
22. 22.Which of these has no microcontroller inside? (a) a smart watch (b) a wind-up toy (c) a washing machine (d) a digital alarm clock
23. 23.🔘 Two switches are in series. When does the bulb glow? (a) when both are ON (b) when both are OFF (c) never (d) when either is ON
24. 24.📏 In the water-pipe picture of a circuit, current is like … (a) a narrow pipe (b) the water pressure (c) the pipe colour (d) the flow of water
25. 25.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
26. 26.🗺️ In an input → process → output plan, is “the fan starts” the input, the process or the output? (a) process (b) input (c) output
27. 27.🔺 A 0.2 V supply is joined across a 2 Ω resistor. What current flows (in amperes)? =
28. 28.True or false: on an LED, the round-side leg is the anode (+). (a) False (b) True
29. 29.🧩 Which component is a resistance knob? (a) potentiometer (b) diode (c) resistor (d) motor
30. 30.⚡ Which formula gives electric power? (a) P = V × I (b) P = V + I (c) P = I ÷ V (d) P = V ÷ I
31. 31.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
32. 32.Which drawing is the symbol for a battery? (a) a circle with an X in it (b) a circle with a cross (c) a circle with V inside (d) many long-short pairs
33. 33.Which of these usually has a microcontroller inside? (a) a wind-up toy (b) a digital alarm clock (c) a hand pump (d) a bicycle bell
34. 34.🗺️ Before building a project, what should you write down first? (a) inputs and outputs (b) the final price (c) the box colour (d) nothing at all
35. 35.True or false: the ammeter measures voltage. (a) False (b) True
36. 36.Which job needs a motor? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) open a gate to 90°
37. 37.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) motor (b) switch (c) ammeter (d) bulb
38. 38.🌈 Which band is read first on a resistor? (a) the widest gap (b) the one nearest an end (c) any band (d) the gold band
39. 39.Which of these is the process? (a) a button press (b) the pump turns on (c) count button presses (d) a motion sensor signal
40. 40.🧭 Which part of a microcontroller board keeps the voltage steady? (a) the reset button (b) the main chip (c) the voltage regulator (d) the power LED

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