Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 591 · 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 home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
2. 2.🔁 repeat 2 times { repeat 6 times { beep } }
   How many beeps are there?
3. 3.🔍 Which is the odd one out? (a) a buzzer (b) a servo motor (c) a motor (d) a push button
4. 4.Which of these mainly makes sound? (a) an LED lamp (b) a ceiling fan (c) a toaster (d) a doorbell
5. 5.🧭 Which part of a microcontroller board brings power and code? (a) the power LED (b) the USB port (c) the pins (d) the main chip
6. 6.🧩 Which component makes a beeping sound? (a) LED (b) buzzer (c) resistor (d) capacitor
7. 7.True or false: a circle with an X in it is the symbol for a junction. (a) False (b) True
8. 8.🧮 Resistors of 22 Ω, 100 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
9. 9.Which drawing is the symbol for a switch? (a) a dot where wires meet (b) a line lifted at a gap (c) two equal parallel lines (d) a long and a short line
10. 10.💡 4 identical bulbs are in parallel and each one takes 0.2 A. What total current (in amperes) comes from the battery? =
11. 11.Which of these is not an IoT device? (a) a Wi-Fi weather station (b) a paper calendar (c) a smart energy meter (d) a fitness band with app
12. 12.🔘 What does a switch do in a circuit? (a) makes electricity (b) stores current (c) changes the voltage (d) opens or closes the loop
13. 13.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) process (b) output (c) input
14. 14.🌈 A resistor has the colour bands yellow, green, red. What is its value (in ohms)?
15. 15.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
17. 17.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 320 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
18. 18.Which of these is safe? (a) touch a switch when wet (b) stay away from pylons (c) use a cable with cuts (d) poke things in a socket
19. 19.🔺 In the V-I-R triangle, how do we find I? (a) I = V + R (b) I = R ÷ V (c) I = V ÷ R (d) I = V × R
20. 20.🔁 What does “count = count + 1” do? (a) adds 1 to count (b) takes 1 away (c) sets count to 1 (d) prints 1
21. 21.Which job needs a servo motor? (a) turn to an exact angle (b) show the temperature (c) move water to plants (d) beep an alarm
22. 22.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) series (b) parallel
23. 23.What does the microcontroller do? (a) measures the real world (b) stores data online (c) reads values, decides (d) acts on a command
24. 24.💡 5 identical bulbs are in parallel and each bulb has its own switch on its path. 2 of the switches are OFF and the rest are ON. How many bulbs glow?
25. 25.🌈 In the resistor colour code, which number does black stand for?
26. 26.📏 Voltmeter or ammeter: which one measures current? (a) voltmeter (b) ammeter
27. 27.True or false: to switch off empty rooms saves electricity. (a) False (b) True
28. 28.🔁 count = 1
    while (count < 11) { count = count + 5 }
    How many times does the loop run?
29. 29.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
30. 30.⏱️ What does “wait 500 ms” do? (a) pauses for half a second (b) blinks 500 times (c) turns the LED off (d) waits 500 seconds
31. 31.💡 A red LED (it uses 2 V) is joined with a 300 Ω resistor to an 8 V supply. What current flows (in mA)?
32. 32.🔋 2 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
33. 33.True or false: “an alert on the phone” is the output. (a) False (b) True
34. 34.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a rain sensor (c) a sound sensor (d) a distance sensor
35. 35.Which of these is true of a series circuit? (a) a single current path (b) one out, the rest glow (c) own switch for each bulb (d) many paths for current
36. 36.🧩 Which component has coloured bands? (a) transistor (b) buzzer (c) resistor (d) potentiometer
37. 37.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they explode (c) they keep glowing (d) they get dimmer
38. 38.🧮 A 1 V battery is joined to 6 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
39. 39.What does a toggle switch do? (a) works only while pressed (b) closes near a magnet (c) flips up or down (d) springs back when let go
40. 40.True or false: an LDR turns a fan or wheels. (a) True (b) False

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