Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 934 · 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 colour bands (1st digit, 2nd digit, multiplier) mark an 8000 Ω resistor? (a) white-grey-red (b) grey-black-red (c) grey-black-orange (d) grey-black-brown
2. 2.⚠️ Is it safe to touch a switch when wet? (a) not safe (b) safe
3. 3.🤖 Where does the board keep its program when the power is off? (a) the resistor (b) flash memory (c) the power LED (d) the USB cable
4. 4.💡 In a series circuit, how many paths does the current have? (a) two (b) none (c) one for each bulb (d) one
5. 5.Which of these is a good habit? (a) tap unknown app links (b) reuse one password (c) share the Wi-Fi key (d) set a strong password
6. 6.🔌 Is aluminium foil a conductor or an insulator? (a) an insulator (b) a conductor
7. 7.🔺 A current of 40 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
8. 8.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) chemical energy (b) movement energy (c) sound energy (d) light energy
9. 9.🤖 “if (A AND B)” is true when … (a) both are false (b) only B is true (c) only A is true (d) both A and B are true
10. 10.🔁 total = 0
    for i = 1 to 6 { total = total + i }
    What is total at the end?
11. 11.🗺️ In an input → process → output plan, is “a temperature reading” the input, the process or the output? (a) output (b) input (c) process
12. 12.Which of these is the process? (a) a soil moisture reading (b) decide if soil is dry (c) a motion sensor signal (d) a light level reading
13. 13.🔌 Is an iron nail a conductor or an insulator? (a) an insulator (b) a conductor
14. 14.🔌 Is a cotton thread a conductor or an insulator? (a) an insulator (b) a conductor
15. 15.Which of these is not safe? (a) dry your hands first (b) use small battery cells (c) use a cable with cuts (d) keep drinks far away
16. 16.🧮 Three equal 30 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
17. 17.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
18. 18.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
19. 19.Which of these is an insulator? (a) a cotton thread (b) a steel spoon (c) a metal paper clip (d) a brass key
20. 20.🤖 if (temperature > 28) { fan ON } else { fan OFF }
    The temperature sensor reads 21 °C. What happens? (a) fan ON (b) fan OFF
21. 21.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 350 ms }
    How many times does the LED blink in 10 seconds?
22. 22.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) True (b) False
23. 23.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a rubber band. Does the bulb glow? (a) No (b) Yes
24. 24.Which of these is a conductor? (a) a cotton thread (b) aluminium foil (c) a plastic straw (d) a wooden stick
25. 25.🧮 A 3 V battery is joined to 6 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
26. 26.✏️ In a circuit diagram, which part is drawn as a long and a short line? (a) LED (b) capacitor (c) cell (d) bulb
27. 27.True or false: an iron nail is an insulator. (a) True (b) False
28. 28.⚠️ Is it safe to take cells out after use? (a) safe (b) not safe
29. 29.💡 What does LED stand for? (a) low energy device (b) light energy dial (c) large electric dial (d) light-emitting diode
30. 30.🔐 Which is the strongest password for a home smart camera? (a) admin (b) password (c) 123456 (d) Tiger#Lamp42!Moon
31. 31.Which drawing is the symbol for a wire? (a) a long and a short line (b) a straight line (c) a small empty box (d) many long-short pairs
32. 32.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
33. 33.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
34. 34.True or false: “a single current path” is true of a parallel circuit. (a) False (b) True
35. 35.Which of these is safe? (a) use mains for a project (b) build with an adult near (c) poke things in a socket (d) throw cells in a fire
36. 36.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) blinks 500 times (c) pauses for half a second (d) turns the LED off
37. 37.🔺 A 6 V supply is joined across a 120 Ω resistor. What current flows (in milliamperes, mA)?
38. 38.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is OFF and C is ON. Does the bulb glow? (a) No (b) Yes
39. 39.🤖 Does a TV remote usually have a microcontroller inside? (a) Yes (b) No
40. 40.🔍 Which is the odd one out? (a) a loudspeaker (b) a school bell (c) an electric iron (d) a buzzer

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