Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 393 · 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.🔌 Is a copper wire a conductor or an insulator? (a) an insulator (b) a conductor
2. 2.🔋 Does a water pump give electricity or use electricity? (a) uses electricity (b) gives electricity
3. 3.Which drawing is the symbol for a battery? (a) triangle against a bar (b) two or more cell symbols (c) a long and a short line (d) a circle with an X in it
4. 4.🤖 “if (A AND B)” is true when … (a) only A is true (b) both A and B are true (c) only B is true (d) both are false
5. 5.📏 In the water-pipe picture of a circuit, current is like … (a) the flow of water (b) the water pressure (c) the pipe colour (d) a narrow pipe
6. 6.🔌 Is a ceramic cup a conductor or an insulator? (a) a conductor (b) an insulator
7. 7.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
8. 8.📶 How many states can a digital pin have? (a) two (b) ten (c) one (d) a thousand
9. 9.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a plastic ruler. Does the bulb glow? (a) No (b) Yes
10. 10.True or false: an LDR senses how bright it is. (a) False (b) True
11. 11.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 60 (c) 10 (d) 100
12. 12.🔌 Is a plastic ruler a conductor or an insulator? (a) a conductor (b) an insulator
13. 13.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the input (b) the process (c) the battery (d) the output
14. 14.🔁 x = 5
    repeat 2 times { x = x × 2 }
    What is x at the end?
15. 15.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) the length of a wire (d) energy used each second
16. 16.🔺 A current of 50 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
17. 17.🌈 A resistor has the colour bands green, orange, black. What is its value (in ohms)?
18. 18.🔺 A current of 20 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
19. 19.⚡ Which tiny particles drift along a metal wire to carry the current? (a) electrons (b) water drops (c) dust particles (d) photons
20. 20.🌈 In the resistor colour code, which number does yellow stand for?
21. 21.Which of these uses electricity? (a) a bicycle dynamo (b) a solar panel (c) a water pump (d) a generator
22. 22.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) a temperature sensor (b) a motion sensor (c) a water pump (d) a keypad
24. 24.Which of these is safe? (a) open a phone charger (b) keep drinks far away (c) use mains for a project (d) touch a switch when wet
25. 25.Which of these is a conductor? (a) a plastic ruler (b) a ceramic cup (c) a cotton thread (d) a graphite rod
26. 26.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
27. 27.🔗 Series or parallel circuit: “many paths for current”? (a) parallel (b) series
28. 28.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
29. 29.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) bulb (b) ammeter (c) motor (d) wire
30. 30.Which of these is the process? (a) the pump turns on (b) decide if soil is dry (c) a soil moisture reading (d) a button press
31. 31.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) gets bigger (c) gets smaller (d) becomes zero
32. 32.🔌 Is a buzzer an input or an output for a microcontroller? (a) input (b) output
33. 33.🌈 A resistor has the colour bands yellow, violet, brown. What is its value (in ohms)?
34. 34.🔺 A current of 50 mA flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
35. 35.⚠️ Is it safe to use a cable with cuts? (a) safe (b) not safe
36. 36.🔐 Privacy for a smart device means controlling … (a) its battery size (b) who can see your data (c) its colour (d) how loud it beeps
37. 37.Which of these is the process? (a) the fan starts (b) count button presses (c) an alert on the phone (d) a buzzer beeps
38. 38.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) resistor (b) battery (c) voltmeter (d) capacitor
39. 39.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 41. What happens? (a) green LED ON (b) red LED ON
40. 40.Which drawing is the symbol for an LED? (a) triangle, bar and arrows (b) a long and a short line (c) a small empty box (d) many long-short pairs

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids