Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 394 · 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.🔁 repeat 6 times { repeat 2 times { beep } }
   How many beeps are there?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
3. 3.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) not joined (c) in series (d) in parallel
4. 4.🔍 Which is the odd one out? (a) the fan starts (b) a temperature reading (c) a buzzer beeps (d) an LED lights up
5. 5.Which of these usually has a microcontroller inside? (a) a spinning top (b) a hand pump (c) a wind-up toy (d) a smart watch
6. 6.True or false: to cover unused cameras is a risky habit. (a) True (b) False
7. 7.🌐 Is a fitness band with app an IoT device? (a) not an IoT device (b) an IoT device
8. 8.🌐 Is a paper calendar an IoT device? (a) an IoT device (b) not an IoT device
9. 9.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put aluminium foil across the gap. Does the bulb glow? (a) Yes (b) No
10. 10.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) ammeter (b) switch (c) resistor (d) bulb
11. 11.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) bulb (b) diode (c) motor (d) wire
12. 12.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) pauses for half a second (c) blinks 500 times (d) turns the LED off
13. 13.⏱️ A program says “wait 5000 ms”. How many seconds is that? =
14. 14.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) bigger (c) zero (d) stay the same
15. 15.⚠️ Is it safe to keep drinks far away? (a) safe (b) not safe
16. 16.🔁 What does a variable do in a program? (a) measures light (b) joins two wires (c) blinks an LED (d) stores a value
17. 17.True or false: to share the Wi-Fi key is a good habit. (a) True (b) False
18. 18.What does a reed switch do? (a) closes near a magnet (b) slides side to side (c) flips up or down (d) works only while pressed
19. 19.Which job needs a pump? (a) move water to plants (b) open a gate to 90° (c) show a status light (d) turn to an exact angle
20. 20.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a copper wire. Does the bulb glow? (a) No (b) Yes
21. 21.🔘 Which kind of switch stays where you flip it? (a) a push button (b) a toggle switch (c) a slide switch (d) a reed switch
22. 22.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
23. 23.🌈 A resistor has the colour bands grey, green, black. What is its value (in ohms)?
24. 24.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 27 °C. What is shown? (a) Hot (b) Cool (c) Warm
25. 25.🧮 Three equal 300 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
26. 26.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) to make it colourful (c) quick and clear for all (d) to hide the circuit
27. 27.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 75 Ω resistor? (a) violet-green-black (b) green-violet-black (c) grey-green-black (d) violet-green-brown
28. 28.🔺 A current of 0.2 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
29. 29.🌈 Which band is read first on a resistor? (a) the gold band (b) any band (c) the one nearest an end (d) the widest gap
30. 30.⏱️ A program says “wait 7250 ms”. How many seconds is that? =
31. 31.🔍 Which is the odd one out? (a) log out of shared phones (b) install software updates (c) set a strong password (d) tap unknown app links
32. 32.⚠️ Which power source should children use for electronics projects? (a) a wall socket (b) a mains extension board (c) an inverter socket (d) a small battery pack
33. 33.🔋 2 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
34. 34.🔐 Is it a good or a risky habit to share camera links? (a) good habit (b) risky habit
35. 35.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
36. 36.Which of these gives us electricity? (a) a television (b) a water pump (c) a washing machine (d) a cell
37. 37.🔋 A 6 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
38. 38.⏱️ loop forever { LED ON; wait 750 ms; LED OFF; wait 750 ms }
    How many milliseconds does one blink (ON + OFF) take?
39. 39.🤖 Microcontroller or laptop: which one needs much more power? (a) laptop (b) microcontroller
40. 40.📏 Voltmeter or ammeter: which one measures current? (a) voltmeter (b) ammeter

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