Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 939 · 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.📏 How many milliamperes (mA) is 0.27 A?
2. 2.What does an LED do? (a) senses how bright it is (b) glows using little power (c) beeps for an alarm (d) makes a beeping sound
3. 3.⚠️ Is it safe to take cells out after use? (a) safe (b) not safe
4. 4.🔍 Which is the odd one out? (a) fly kites in open fields (b) throw cells in a fire (c) use small battery cells (d) dry your hands first
5. 5.Which of these is not an IoT device? (a) a smart energy meter (b) a Wi-Fi weather station (c) a paper calendar (d) a fitness band with app
6. 6.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True
7. 7.🔘 A cell, a bulb and switches A, B and C are joined one after another in a single loop (series). A is ON, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
8. 8.🔺 A 12 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
9. 9.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the length of a wire (d) the colour of light
10. 10.What does a transistor do? (a) stores a little charge (b) makes a beeping sound (c) blows if current is high (d) boosts a small signal
11. 11.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 100 (c) 1000 (d) 60
12. 12.🔌 Is a steel spoon a conductor or an insulator? (a) an insulator (b) a conductor
13. 13.🌐 A soil sensor sends a reading to an app every 20 minutes. How many readings arrive in 3 hours?
14. 14.Which of these is an insulator? (a) a steel coin (b) a metal paper clip (c) a plastic ruler (d) a graphite rod
15. 15.🔍 Which is the odd one out? (a) a graphite rod (b) a steel spoon (c) a safety pin (d) a plastic ruler
16. 16.🔍 Which is the odd one out? (a) post your live location (b) accept every permission (c) read app permissions (d) reuse one password
17. 17.⚡ What does an electric drill mainly change electricity into? (a) light (b) sound (c) heat (d) movement
18. 18.Which of these is true of a parallel circuit? (a) used in house wiring (b) one bulb out, all go out (c) bulbs share the voltage (d) a single current path
19. 19.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) zero (c) stay the same (d) bigger
20. 20.Which of these is not safe? (a) keep drinks far away (b) take cells out after use (c) climb an electric pole (d) use small battery cells
21. 21.🔺 A 5 V supply is joined across a 200 Ω resistor. What current flows (in milliamperes, mA)?
22. 22.🌈 In the resistor colour code, which number does green stand for?
23. 23.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
24. 24.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
25. 25.Which of these is an insulator? (a) an iron nail (b) a ceramic cup (c) a metal paper clip (d) a graphite rod
26. 26.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) process (b) output (c) input
27. 27.🧩 A capacitor in a circuit can … (a) store charge briefly (b) spin a wheel (c) measure heat (d) make light
28. 28.⚡ Which tiny particles drift along a metal wire to carry the current? (a) photons (b) water drops (c) electrons (d) dust particles
29. 29.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) never (b) only when both are ON (c) only when both are OFF (d) when either is ON
30. 30.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
31. 31.🔐 Is it a good or a risky habit to turn off unused gadgets? (a) risky habit (b) good habit
32. 32.True or false: “a temperature reading” is the process. (a) False (b) True
33. 33.🧮 Two resistors in parallel give a total that is … (a) their sum (b) more than either one (c) always zero (d) less than either one
34. 34.🌐 A weather station sends one reading every 15 seconds. How many readings does it send in 1 minute?
35. 35.Which of these mainly gives out light? (a) an exhaust fan (b) a traffic signal (c) a siren (d) an electric iron
36. 36.🔌 Which part of a screwdriver should an electrician hold? (a) the metal tip (b) the plastic handle (c) the steel shaft (d) the bare end
37. 37.💡 In a series circuit, how many paths does the current have? (a) none (b) one (c) two (d) one for each bulb
38. 38.🔦 A circuit has a used-up (dead) 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 copper wire. Does the bulb glow? (a) No (b) Yes
39. 39.⚠️ Is it safe to stop if a part gets hot? (a) safe (b) not safe
40. 40.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 19 °C. What is shown? (a) Warm (b) Cool (c) Hot

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