Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 424 · 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.🌐 What does IoT stand for? (a) Inside of Toys (b) Internet of Talk (c) Input of Tools (d) Internet of Things
2. 2.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
3. 3.True or false: a plain rectangle is the symbol for a voltmeter. (a) True (b) False
4. 4.🔐 Is it a good or a risky habit to set a strong password? (a) good habit (b) risky habit
5. 5.Which of these is safe? (a) touch a switch when wet (b) poke things in a socket (c) use a cable with cuts (d) keep drinks far away
6. 6.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
7. 7.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. How many bulbs glow?
8. 8.⚠️ Why must we never touch switches with wet hands? (a) water carries current (b) it spoils the paint (c) water makes it cold (d) it is just untidy
9. 9.🤖 if (temperature > 32) { fan ON } else { fan OFF }
   The temperature sensor reads 27 °C. What happens? (a) fan ON (b) fan OFF
10. 10.🔺 A 10 V supply is joined across a 400 Ω resistor. What current flows (in milliamperes, mA)?
11. 11.🔁 repeat 6 times { repeat 6 times { beep } }
    How many beeps are there?
12. 12.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
13. 13.🔘 Which kind of switch works only while pressed? (a) a slide switch (b) a tilt switch (c) a toggle switch (d) a push button
14. 14.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
15. 15.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
16. 16.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) blinks 500 times (c) turns the LED off (d) pauses for half a second
17. 17.Which of these has no microcontroller inside? (a) a spinning top (b) a digital thermometer (c) a washing machine (d) a TV remote
18. 18.Which job needs a pump? (a) show a status light (b) turn to an exact angle (c) show the temperature (d) move water to plants
19. 19.🔢 To get a sensor reading onto a phone, which is the FIRST step? (a) the cloud stores it (b) the app shows it (c) it is sent by Wi-Fi (d) the sensor measures
20. 20.🔁 count = 0
    repeat 7 times { count = count + 7 }
    What is count at the end?
21. 21.💡 A red LED uses 2 V and should get 10 mA. It runs from a 9 V supply. What resistor (in ohms) is needed in series?
22. 22.🔋 How many 2 V cells must be joined in series to give 4 V?
23. 23.True or false: the voltmeter measures voltage. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) ignore update messages (b) keep factory passwords (c) share the Wi-Fi key (d) cover unused cameras
25. 25.Which of these usually has a microcontroller inside? (a) a candle (b) a wind-up toy (c) a hand pump (d) a digital thermometer
26. 26.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) False (b) True
27. 27.🔌 Is aluminium foil a conductor or an insulator? (a) a conductor (b) an insulator
28. 28.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) gets smaller (c) stays the same (d) becomes zero
29. 29.True or false: a plain rectangle is the symbol for a cell. (a) False (b) True
30. 30.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
31. 31.🌐 Is a Wi-Fi weather station an IoT device? (a) not an IoT device (b) an IoT device
32. 32.🔗 Series or parallel circuit: “used in house wiring”? (a) parallel (b) series
33. 33.🔍 Which is the odd one out? (a) climb an electric pole (b) fly kites in open fields (c) fly a kite near wires (d) touch a fallen wire
34. 34.🔺 A current of 0.5 A flows when 6 V is joined across a resistor. What is its resistance (in ohms)?
35. 35.🔁 count = 5
    while (count < 15) { count = count + 2 }
    How many times does the loop run?
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
37. 37.🤖 Where does the board keep its program when the power is off? (a) the resistor (b) the power LED (c) the USB cable (d) flash memory
38. 38.💡 What happens if an LED is put in backwards? (a) it does not light (b) it changes colour (c) it lights brighter (d) it makes a sound
39. 39.🔍 Which is the odd one out? (a) turn off unused gadgets (b) change default passwords (c) share the Wi-Fi key (d) read app permissions
40. 40.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a sound sensor (c) a temperature sensor (d) a soil moisture sensor

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