Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 734 · 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 bicycle dynamo changes which kind of energy into electricity? (a) light energy (b) chemical energy (c) movement energy (d) sound energy
2. 2.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
3. 3.True or false: on an LED, the longer leg is the anode (+). (a) False (b) True
4. 4.🔁 What does “count = count + 1” do? (a) takes 1 away (b) prints 1 (c) sets count to 1 (d) adds 1 to count
5. 5.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
6. 6.🔋 How many volts does one ordinary torch cell give? (a) 15 V (b) 1.5 V (c) 230 V (d) 0.5 V
7. 7.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. How many bulbs glow?
8. 8.True or false: to change default passwords is a good habit. (a) False (b) True
9. 9.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a servo motor (c) a buzzer (d) a display
10. 10.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
11. 11.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) junction (b) switch (c) motor (d) wire
12. 12.True or false: “how bright a room is” is a digital signal. (a) True (b) False
13. 13.Which of these is not safe? (a) dry your hands first (b) build with an adult near (c) stop if a part gets hot (d) use mains for a project
14. 14.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
15. 15.🔐 A smart-camera app asks for your school name and home address. What should you do? (a) share it with friends (b) ask a parent first (c) type it all in (d) post it online
16. 16.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 70 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
17. 17.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
18. 18.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 350 ms }
    How many times does the LED blink in 7 seconds?
19. 19.Which of these is the output? (a) a soil moisture reading (b) a motion sensor signal (c) the pump turns on (d) a temperature reading
20. 20.True or false: the push of a cell is measured in amperes (A). (a) True (b) False
21. 21.🔁 What does a variable do in a program? (a) joins two wires (b) measures light (c) stores a value (d) blinks an LED
22. 22.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 100 (c) 1000 (d) 10
23. 23.💡 3 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 2 is taken out of its holder. How many bulbs glow?
24. 24.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
25. 25.Which of these uses electricity? (a) a solar panel (b) a refrigerator (c) a battery (d) a bicycle dynamo
26. 26.True or false: the voltmeter measures voltage. (a) False (b) True
27. 27.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
28. 28.Which drawing is the symbol for a wire? (a) two equal parallel lines (b) a circle with a cross (c) a straight line (d) a long and a short line
29. 29.Which of these is an IoT device? (a) a plain table fan (b) a paper calendar (c) a battery torch (d) a smart energy meter
30. 30.⚡ What do we call a flow of electric charge through a wire? (a) friction (b) electric current (c) sound (d) a magnet
31. 31.⚠️ About how many volts do home sockets in India supply? (a) 230 V (b) 1.5 V (c) 9 V (d) 12 V
32. 32.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True
33. 33.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 1700 Ω resistor? (a) brown-violet-red (b) violet-brown-red (c) brown-violet-orange (d) brown-violet-brown
34. 34.🧮 A 14 V battery is joined to 8 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
35. 35.Which job needs a temperature sensor? (a) stop a robot near walls (b) switch on with a clap (c) start a fan when hot (d) close a window in rain
36. 36.🌐 In an IoT system, which part stores data online? (a) cloud server (b) microcontroller (c) sensor (d) Wi-Fi
37. 37.Which of these is an IoT device? (a) a plain wall switch (b) an app-controlled bulb (c) a pencil sharpener (d) a wind-up clock
38. 38.Which of these is a good habit? (a) share camera links (b) ignore update messages (c) set up with a parent (d) post your live location
39. 39.True or false: the voltmeter is joined in series. (a) False (b) True
40. 40.🔗 Series or parallel circuit: “each gets the full volts”? (a) parallel (b) series

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