Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 921 · 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 of these is a good habit? (a) keep factory passwords (b) share the Wi-Fi key (c) share only needed data (d) tap unknown app links
2. 2.🔁 What does “count = count + 1” do? (a) sets count to 1 (b) adds 1 to count (c) takes 1 away (d) prints 1
3. 3.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
4. 4.🔍 Which is the odd one out? (a) keep drinks far away (b) stop if a part gets hot (c) climb an electric pole (d) use small battery cells
5. 5.🧭 Which part of a microcontroller board shows the board is on? (a) the main chip (b) the voltage regulator (c) the power LED (d) the USB port
6. 6.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. How many bulbs glow?
7. 7.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
   The temperature is 35 °C. What is shown? (a) Cool (b) Warm (c) Hot
8. 8.What does a resistor do? (a) limits the current (b) senses how hot it is (c) turns a fan or wheels (d) senses how bright it is
9. 9.💡 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
10. 10.🔢 To plan an electronics project, what comes right after “build it with an adult”? (a) pick a problem to solve (b) list inputs and outputs (c) draw the circuit diagram (d) test it and fix it
11. 11.💡 What happens if an LED is put in backwards? (a) it changes colour (b) it makes a sound (c) it does not light (d) it lights brighter
12. 12.Which drawing is the symbol for an ammeter? (a) a circle with V inside (b) a circle with A inside (c) a circle with an X in it (d) triangle, bar and arrows
13. 13.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
14. 14.🔁 What does a variable do in a program? (a) measures light (b) joins two wires (c) blinks an LED (d) stores a value
15. 15.🗺️ Before building a project, what should you write down first? (a) the final price (b) the box colour (c) inputs and outputs (d) nothing at all
16. 16.Which drawing is the symbol for a junction? (a) a dot where wires meet (b) triangle, bar and arrows (c) a straight line (d) a long and a short line
17. 17.🔢 To plan an electronics project, which comes first: “draw the circuit diagram” or “list inputs and outputs”? (a) list inputs and outputs (b) draw the circuit diagram
18. 18.🧮 Five equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
19. 19.⚡ Which formula gives electric power? (a) P = V + I (b) P = I ÷ V (c) P = V ÷ I (d) P = V × I
20. 20.🔋 7 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
21. 21.Which of these is true of a series circuit? (a) own switch for each bulb (b) one out, the rest glow (c) bulbs share the voltage (d) many paths for current
22. 22.🔢 To plan an electronics project, which comes first: “pick a problem to solve” or “draw the circuit diagram”? (a) draw the circuit diagram (b) pick a problem to solve
23. 23.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
24. 24.What does the microcontroller do? (a) acts on a command (b) measures the real world (c) shows data to you (d) reads values, decides
25. 25.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a motion sensor (c) a distance sensor (d) a temperature sensor
26. 26.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
27. 27.True or false: a dry cork is an insulator. (a) False (b) True
28. 28.⏱️ A program says “wait 1250 ms”. How many seconds is that? =
29. 29.🧩 Which part changes electrical energy into sound? (a) a buzzer (b) a diode (c) a capacitor (d) a resistor
30. 30.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) motor (b) junction (c) cell (d) LED
31. 31.🔋 What should you do with used-up cells? (a) cut them open (b) give them for recycling (c) bury them in soil (d) throw them in a fire
32. 32.Which of these is the input? (a) a soil moisture reading (b) a buzzer beeps (c) an LED lights up (d) the pump turns on
33. 33.True or false: on an LED, the longer leg is the anode (+). (a) True (b) False
34. 34.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 78. What happens? (a) red LED ON (b) green LED ON
35. 35.What does a buzzer do? (a) has coloured bands (b) turns a fan or wheels (c) beeps for an alarm (d) makes things spin
36. 36.🔍 Which is the odd one out? (a) a Wi-Fi smart plug (b) a fitness band with app (c) a Wi-Fi doorbell camera (d) a pencil sharpener
37. 37.True or false: “an alert on the phone” is the output. (a) True (b) False
38. 38.What does a motor do? (a) makes things spin (b) senses how bright it is (c) stores a little charge (d) lets current go one way
39. 39.Which of these is safe? (a) use a cable with cuts (b) use small battery cells (c) climb an electric pole (d) fly a kite near wires
40. 40.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) wavy lines (c) little stars (d) straight lines

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