Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 250 · 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.🔐 Which is the strongest password for a home smart camera? (a) Tiger#Lamp42!Moon (b) password (c) 123456 (d) admin
2. 2.🌈 A resistor has the colour bands yellow, white, yellow. What is its value in kilo-ohms (kΩ)? =
3. 3.🗺️ In an input → process → output plan, is “a temperature reading” the input, the process or the output? (a) input (b) process (c) output
4. 4.🔁 count = 2
   repeat 5 times { count = count + 7 }
   What is count at the end?
5. 5.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in parallel (c) in series (d) not joined
6. 6.True or false: to change default passwords is a risky habit. (a) False (b) True
7. 7.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) both lines (c) the longer line (d) neither line
8. 8.🔘 A bulb and a cell are joined through 2 switches on 2 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
9. 9.🔁 total = 0
   for i = 1 to 12 { total = total + i }
   What is total at the end?
10. 10.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.🔘 What does a switch do in a circuit? (a) changes the voltage (b) makes electricity (c) stores current (d) opens or closes the loop
12. 12.What does a tilt switch do? (a) stays where you flip it (b) flips up or down (c) closes when tipped over (d) works only while pressed
13. 13.Which drawing is the symbol for a wire? (a) a long and a short line (b) one tall, one short bar (c) a straight line (d) a plain rectangle
14. 14.🔘 Which kind of switch flips up or down? (a) a push button (b) a reed switch (c) a tilt switch (d) a toggle switch
15. 15.⚡ What does a water heater mainly change electricity into? (a) sound (b) movement (c) light (d) heat
16. 16.🧮 Resistors of 220 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
17. 17.🔁 count = 0
    while (count < 14) { count = count + 2 }
    How many times does the loop run?
18. 18.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) ammeter (b) motor (c) bulb (d) resistor
19. 19.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) True (b) False
20. 20.True or false: “own switch for each bulb” is true of a series circuit. (a) True (b) False
21. 21.🔌 Which part of a screwdriver should an electrician hold? (a) the plastic handle (b) the bare end (c) the steel shaft (d) the metal tip
22. 22.🌐 How does a home IoT device usually send its data to the app? (a) by shouting (b) through a candle (c) by post (d) over Wi-Fi
23. 23.🔐 A smart speaker is always listening for its wake word. What is a sensible habit? (a) mute it when not in use (b) let strangers use it (c) tell it your passwords (d) put it in the bathroom
24. 24.True or false: to stay away from pylons is safe. (a) False (b) True
25. 25.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
26. 26.✏️ In a circuit diagram, which part is drawn as a circle with a cross? (a) ammeter (b) bulb (c) battery (d) junction
27. 27.🔁 What does a variable do in a program? (a) stores a value (b) measures light (c) joins two wires (d) blinks an LED
28. 28.True or false: a toggle switch stays where you flip it. (a) True (b) False
29. 29.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
30. 30.⚠️ Which power source should children use for electronics projects? (a) a wall socket (b) a mains extension board (c) a small battery pack (d) an inverter socket
31. 31.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.Which of these is an insulator? (a) a steel coin (b) a safety pin (c) a brass key (d) a rubber band
33. 33.⚠️ Why must we never touch switches with wet hands? (a) it is just untidy (b) water makes it cold (c) it spoils the paint (d) water carries current
34. 34.🤖 Does a microwave oven usually have a microcontroller inside? (a) Yes (b) No
35. 35.💡 4 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. How many bulbs glow?
36. 36.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 2 glow? (a) No (b) Yes
37. 37.⏱️ How many milliseconds is a wait of 1 seconds?
38. 38.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 2000 Ω resistor? (a) orange-red-red (b) red-black-red (c) red-black-brown (d) red-black-orange
39. 39.True or false: how much a part resists is measured in ohms (Ω). (a) False (b) True
40. 40.True or false: many long-short pairs is the symbol for a battery. (a) True (b) False

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