Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 948 · 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 parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
2. 2.🔁 What must there be for a current to flow? (a) one loose end (b) a broken path (c) a complete loop (d) a plastic gap
3. 3.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
4. 4.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) process (b) output (c) input
5. 5.🔍 Which is the odd one out? (a) the fan starts (b) a light level reading (c) an alert on the phone (d) a buzzer beeps
6. 6.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
   The temperature is 28 °C. What is shown? (a) Hot (b) Warm (c) Cool
7. 7.🧮 Resistors of 22 Ω, 150 Ω, 20 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
8. 8.🔋 How many 3 V cells must be joined in series to give 21 V?
9. 9.🤖 Which is a safe power source for a beginner microcontroller board? (a) a wall socket directly (b) USB or a 9 V battery (c) bare mains wires (d) a 230 V cable
10. 10.🔺 A 16 V supply is joined across a 400 Ω resistor. What current flows (in milliamperes, mA)?
11. 11.True or false: “a motion sensor signal” is the process. (a) False (b) True
12. 12.💡 5 identical bulbs are joined in series with a 7.5 V battery (ideal wires). How many volts does each bulb get? =
13. 13.Which drawing is the symbol for a battery? (a) a circle with A inside (b) one tall, one short bar (c) two or more cell symbols (d) two equal parallel lines
14. 14.🔗 Series or parallel circuit: “many paths for current”? (a) parallel (b) series
15. 15.Which of these is an input? (a) a small display (b) a water pump (c) a servo motor (d) a turning knob
16. 16.Which of these means the circuit is open? (a) the loop is complete (b) all wires are joined (c) a cell is taken out (d) the switch is ON
17. 17.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) stays the same (c) gets smaller (d) becomes zero
18. 18.True or false: a circle with a cross is the symbol for a bulb. (a) True (b) False
19. 19.🔋 Does a generator give electricity or use electricity? (a) gives electricity (b) uses electricity
20. 20.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put an iron nail across the gap. Does the bulb glow? (a) No (b) Yes
21. 21.🌐 A weather station sends one reading every 60 seconds. How many readings does it send in 5 minutes?
22. 22.True or false: a microcontroller has no screen of its own. (a) False (b) True
23. 23.Which of these is true of a series circuit? (a) many paths for current (b) bulbs share the voltage (c) own switch for each bulb (d) one out, the rest glow
24. 24.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 22000 Ω resistor? (a) red-orange-orange (b) red-red-red (c) red-red-yellow (d) red-red-orange
25. 25.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a plastic straw. Does the bulb glow? (a) No (b) Yes
26. 26.Which of these is an output? (a) a sound sensor (b) a speaker (c) a push button (d) a keypad
27. 27.🔗 Series or parallel circuit: “each gets the full volts”? (a) series (b) parallel
28. 28.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) battery (b) bulb (c) motor (d) voltmeter
29. 29.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) resistor (b) switch (c) battery (d) ammeter
30. 30.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
31. 31.🔍 Which is the odd one out? (a) keep factory passwords (b) accept every permission (c) tap unknown app links (d) change default passwords
32. 32.🔁 count = 7
    repeat 9 times { count = count + 2 }
    What is count at the end?
33. 33.🌐 A weather station sends one reading every 30 seconds. How many readings does it send in 1 minute?
34. 34.🔢 To run one loop of a plant-watering program, what comes right after “compare with the limit”? (a) read the soil sensor (b) switch the pump on/off (c) wait a few seconds
35. 35.🔺 A current of 3 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
36. 36.True or false: on a cell, “the longer symbol line” means the + (positive) end. (a) True (b) False
37. 37.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
38. 38.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 45 °C. What is shown? (a) Warm (b) Hot (c) Cool
39. 39.Which of these is true of a series circuit? (a) own switch for each bulb (b) each gets the full volts (c) many paths for current (d) a single current path
40. 40.🧮 Four equal 80 Ω resistors are joined in parallel. What is the total resistance (in ohms)?

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