Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 196 · 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.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
   set pin 8 HIGH
   set pin 8 HIGH
   set pin 7 HIGH
   set pin 8 HIGH
   set pin 8 LOW
   Is the LED ON or OFF at the end? (a) OFF (b) ON
2. 2.🔍 Which is the odd one out? (a) an iron nail (b) a steel spoon (c) a safety pin (d) a wooden stick
3. 3.Which drawing is the symbol for a capacitor? (a) a small empty box (b) a circle with an X in it (c) two or more cell symbols (d) two equal parallel lines
4. 4.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) Yes (b) No
5. 5.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) battery (b) resistor (c) junction (d) ammeter
6. 6.True or false: a TV remote has no microcontroller inside. (a) True (b) False
7. 7.What does a thermistor do? (a) boosts a small signal (b) limits the current (c) senses how hot it is (d) makes a beeping sound
8. 8.🤖 if (light < 400) { lamp ON } else { lamp OFF }
   The light sensor reads 437. What happens? (a) lamp ON (b) lamp OFF
9. 9.🔍 Which is the odd one out? (a) a buzzer beeps (b) an LED lights up (c) decide if soil is dry (d) the pump turns on
10. 10.🌈 A resistor has the colour bands yellow, black, orange. What is its value (in ohms)?
11. 11.🔦 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 wooden stick. Does the bulb glow? (a) No (b) Yes
12. 12.🔺 A current of 2 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
13. 13.📶 Digital or analog: the room temperature? (a) analog (b) digital
14. 14.📏 How many watts (W) is 2 kW?
15. 15.📏 Which unit measures energy used each second? (a) ohm (Ω) (b) ampere (A) (c) volt (V) (d) watt (W)
16. 16.Which job is done by the pins? (a) brings power and code (b) connect sensors and LEDs (c) restarts the program (d) shows the board is on
17. 17.🧩 Which component limits the current? (a) fuse (b) resistor (c) thermistor (d) transistor
18. 18.🔁 What must there be for a current to flow? (a) one loose end (b) a plastic gap (c) a complete loop (d) a broken path
19. 19.🔋 2 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
20. 20.🤖 if (sound > 70) { red LED ON } else { green LED ON }
    The sound sensor reads 58. What happens? (a) green LED ON (b) red LED ON
21. 21.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 17 °C. What is shown? (a) Warm (b) Hot (c) Cool
22. 22.True or false: a tilt switch closes near a magnet. (a) True (b) False
23. 23.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
24. 24.🔺 In the V-I-R triangle, how do we find V? (a) V = I ÷ R (b) V = I + R (c) V = I × R (d) V = R ÷ I
25. 25.Which of these usually has a microcontroller inside? (a) a candle (b) a toy robot (c) a spinning top (d) a bicycle bell
26. 26.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
27. 27.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 23 °C. What is shown? (a) Hot (b) Cool (c) Warm
28. 28.📏 Voltmeter or ammeter: which one is joined across a part? (a) ammeter (b) voltmeter
29. 29.True or false: if a cell is taken out, the circuit is closed and current flows. (a) False (b) True
30. 30.Which of these is a risky habit? (a) share the Wi-Fi key (b) share only needed data (c) turn off unused gadgets (d) cover unused cameras
31. 31.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an input (d) an output
32. 32.⚠️ Is it safe to fly kites in open fields? (a) not safe (b) safe
33. 33.🔺 A current of 0.1 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
34. 34.🔢 To plan an electronics project, which is the LAST step? (a) pick a problem to solve (b) test it and fix it (c) build it with an adult (d) list inputs and outputs
35. 35.What does a tilt switch do? (a) springs back when let go (b) slides side to side (c) closes when tipped over (d) stays where you flip it
36. 36.🔐 A smart speaker is always listening for its wake word. What is a sensible habit? (a) put it in the bathroom (b) mute it when not in use (c) let strangers use it (d) tell it your passwords
37. 37.⚠️ Which power source should children use for electronics projects? (a) an inverter socket (b) a wall socket (c) a mains extension board (d) a small battery pack
38. 38.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
39. 39.True or false: on a cell, “the flat end” means the + (positive) end. (a) False (b) True
40. 40.📏 How many kilo-ohms (kΩ) is 6900 Ω? =

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