Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 736 · 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 drawing is the symbol for a voltmeter? (a) a straight line (b) a circle with V inside (c) two or more cell symbols (d) a small empty box
2. 2.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
3. 3.📏 Which unit measures the flow of charge? (a) watt (W) (b) volt (V) (c) ohm (Ω) (d) ampere (A)
4. 4.⚠️ Is it safe to poke things in a socket? (a) safe (b) not safe
5. 5.True or false: “used in house wiring” is true of a parallel circuit. (a) True (b) False
6. 6.True or false: to keep drinks far away is safe. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a light sensor (b) a water pump (c) a motion sensor (d) a turning knob
8. 8.🌈 A resistor has the colour bands white, brown, brown. What is its value (in ohms)?
9. 9.True or false: one tall, one short bar is the symbol for a junction. (a) False (b) True
10. 10.⏱️ repeat 6 times { buzzer ON; wait 800 ms; buzzer OFF; wait 300 ms }
    How many milliseconds does this take in all?
11. 11.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
12. 12.What does a toggle switch do? (a) slides side to side (b) flips up or down (c) works only while pressed (d) closes when tipped over
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
14. 14.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) parallel (b) series
15. 15.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
16. 16.⏱️ repeat 7 times { buzzer ON; wait 500 ms; buzzer OFF; wait 1000 ms }
    How many milliseconds does this take in all?
17. 17.🔋 5 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
18. 18.🗺️ Before building a project, what should you write down first? (a) the final price (b) the box colour (c) nothing at all (d) inputs and outputs
19. 19.🔍 Which is the odd one out? (a) an app-controlled bulb (b) a Wi-Fi doorbell camera (c) a paper calendar (d) a Wi-Fi weather station
20. 20.🔍 Which is the odd one out? (a) a woollen thread (b) a plastic straw (c) an iron nail (d) a paper strip
21. 21.🔺 A current of 25 mA flows when 3.75 V is joined across a resistor. What is its resistance (in ohms)?
22. 22.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark an 8200 Ω resistor? (a) grey-red-orange (b) grey-red-brown (c) red-grey-red (d) grey-red-red
23. 23.True or false: a smart watch usually has a microcontroller inside. (a) True (b) False
24. 24.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
25. 25.🧩 Which component senses how hot it is? (a) capacitor (b) buzzer (c) thermistor (d) diode
26. 26.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
27. 27.🧩 Which part changes electrical energy into sound? (a) a buzzer (b) a resistor (c) a diode (d) a capacitor
28. 28.🧩 Which component senses how bright it is? (a) diode (b) capacitor (c) LDR (d) potentiometer
29. 29.🧩 A capacitor in a circuit can … (a) measure heat (b) store charge briefly (c) spin a wheel (d) make light
30. 30.🌈 In the resistor colour code, which number does green stand for?
31. 31.🔺 A current of 0.5 A flows when 2.5 V is joined across a resistor. What is its resistance (in ohms)?
32. 32.⚡ What does a tube light mainly change electricity into? (a) heat (b) movement (c) light (d) sound
33. 33.What does the cloud server do? (a) measures the real world (b) carries the data (c) stores data online (d) acts on a command
34. 34.True or false: energy used each second is measured in watts (W). (a) False (b) True
35. 35.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 38 °C. What is shown? (a) Cool (b) Warm (c) Hot
36. 36.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) closed (b) open
37. 37.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the filament (b) the switch (c) the base (d) the glass
38. 38.True or false: “a break stops every bulb” is true of a series circuit. (a) False (b) True
39. 39.🔁 What does “count = count + 1” do? (a) adds 1 to count (b) sets count to 1 (c) takes 1 away (d) prints 1
40. 40.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic makes current (c) plastic is a conductor (d) plastic is an insulator

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