Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 527 · 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 milliseconds is a wait of 1.5 seconds?
2. 2.🔘 Which kind of switch closes near a magnet? (a) a toggle switch (b) a tilt switch (c) a slide switch (d) a reed switch
3. 3.True or false: on an LED, the leg by the flat edge is the anode (+). (a) True (b) False
4. 4.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
5. 5.🔌 Is a metal paper clip a conductor or an insulator? (a) a conductor (b) an insulator
6. 6.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the battery (b) the output (c) the process (d) the input
7. 7.🧩 Which component lets current go one way? (a) fuse (b) diode (c) motor (d) thermistor
8. 8.Which of these mainly gives out heat? (a) a tube light (b) an LED lamp (c) a room heater (d) a school bell
9. 9.🔋 Does a television give electricity or use electricity? (a) uses electricity (b) gives electricity
10. 10.🧩 Which component has coloured bands? (a) LED (b) resistor (c) capacitor (d) LDR
11. 11.🔍 Which is the odd one out? (a) a night lamp (b) a street light (c) a rice cooker (d) a torch
12. 12.Which job is done by the voltage regulator? (a) restarts the program (b) connect sensors and LEDs (c) brings power and code (d) keeps the voltage steady
13. 13.🌈 A resistor has the colour bands white, yellow, red. What is its value in kilo-ohms (kΩ)? =
14. 14.💡 What happens if an LED is put in backwards? (a) it does not light (b) it changes colour (c) it lights brighter (d) it makes a sound
15. 15.True or false: a paper strip is a conductor. (a) False (b) True
16. 16.True or false: if a wire has come loose, the circuit is closed and current flows. (a) False (b) True
17. 17.Which drawing is the symbol for a bulb? (a) a long and a short line (b) a circle with a cross (c) a circle with M inside (d) two equal parallel lines
18. 18.⏱️ repeat 2 times { buzzer ON; wait 500 ms; buzzer OFF; wait 300 ms }
    How many milliseconds does this take in all?
19. 19.🔁 x = 5
    repeat 2 times { x = x × 2 }
    What is x at the end?
20. 20.True or false: a motor makes things spin. (a) False (b) True
21. 21.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
22. 22.Which of these is measured in volts (V)? (a) the flow of charge (b) power (c) voltage (d) how much a part resists
23. 23.Which of these uses electricity? (a) a battery (b) a television (c) a bicycle dynamo (d) a solar panel
24. 24.🔺 In the V-I-R triangle, how do we find I? (a) I = R ÷ V (b) I = V + R (c) I = V × R (d) I = V ÷ R
25. 25.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) capacitor (b) cell (c) LED (d) resistor
26. 26.True or false: to fly a kite near wires is not safe. (a) False (b) True
27. 27.🧮 Two resistors in parallel give a total that is … (a) their sum (b) less than either one (c) always zero (d) more than either one
28. 28.🔐 Why install updates on IoT devices? (a) they delete the Wi-Fi (b) they make it heavier (c) they fix security holes (d) they change the colour
29. 29.True or false: to use mains for a project is not safe. (a) False (b) True
30. 30.Which of these is the process? (a) check if temp > 30 (b) a temperature reading (c) the fan starts (d) a buzzer beeps
31. 31.🧩 Which part changes electrical energy into movement? (a) a resistor (b) an LED (c) a motor (d) a fuse
32. 32.🔺 A current of 40 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
33. 33.💡 6 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 6 is taken out of its holder. How many bulbs glow?
34. 34.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) the if part (c) both parts (d) neither part
35. 35.True or false: if the loop is complete, the circuit is open and no current flows. (a) True (b) False
36. 36.🧮 Three equal 15 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
37. 37.🔺 A current of 10 mA flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
38. 38.🔢 To run one loop of a plant-watering program, what comes right after “read the soil sensor”? (a) switch the pump on/off (b) compare with the limit (c) wait a few seconds
39. 39.True or false: if the switch is ON, the circuit is closed and current flows. (a) True (b) False
40. 40.⚠️ Which power source should children use for electronics projects? (a) a wall socket (b) a mains extension board (c) a small battery pack (d) an inverter socket

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