Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 147 · 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.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) smaller (c) bigger (d) stay the same
2. 2.Which of these is an insulator? (a) a woollen thread (b) a safety pin (c) a metal paper clip (d) a copper wire
3. 3.🧮 A 10 V battery is joined to 4 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
4. 4.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
5. 5.🧮 Two resistors in parallel give a total that is … (a) always zero (b) less than either one (c) more than either one (d) their sum
6. 6.💡 What happens if an LED is put in backwards? (a) it lights brighter (b) it makes a sound (c) it does not light (d) it changes colour
7. 7.⚠️ Is it safe to dry your hands first? (a) not safe (b) safe
8. 8.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
9. 9.Which of these is not an IoT device? (a) a smart energy meter (b) a plain wall switch (c) a Wi-Fi weather station (d) a Wi-Fi doorbell camera
10. 10.🔢 To run one loop of a plant-watering program, which is the FIRST step? (a) switch the pump on/off (b) wait a few seconds (c) read the soil sensor (d) compare with the limit
11. 11.🤖 Microcontroller or laptop: which one runs one small program? (a) microcontroller (b) laptop
12. 12.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = I ÷ V (c) R = V × I (d) R = V + I
13. 13.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) resistor (b) LED (c) capacitor (d) battery
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
15. 15.What does a diode do? (a) senses how hot it is (b) turns a fan or wheels (c) lets current go one way (d) is a resistance knob
16. 16.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) quick and clear for all (c) symbols are heavier (d) to hide the circuit
17. 17.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) cell (b) resistor (c) bulb (d) battery
18. 18.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark an 89 Ω resistor? (a) grey-white-brown (b) white-white-black (c) grey-white-black (d) white-grey-black
19. 19.🔁 total = 0
    for i = 1 to 11 { total = total + i }
    What is total at the end?
20. 20.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) in series (c) in parallel (d) by Wi-Fi
21. 21.True or false: a circle with a cross is the symbol for a motor. (a) False (b) True
22. 22.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
23. 23.True or false: a tilt switch closes when tipped over. (a) True (b) False
24. 24.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) resistor (b) ammeter (c) voltmeter (d) junction
25. 25.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = I ÷ V (d) P = V × I
26. 26.🔘 When a switch is ON, the circuit is … (a) closed (b) broken (c) open (d) cut
27. 27.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. How many bulbs glow?
28. 28.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a graphite rod across the gap. Does the bulb glow? (a) Yes (b) No
29. 29.True or false: to stay away from pylons is not safe. (a) False (b) True
30. 30.🔌 Which part of a screwdriver should an electrician hold? (a) the bare end (b) the steel shaft (c) the metal tip (d) the plastic handle
31. 31.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 110 Ω resistor? (a) brown-brown-brown (b) brown-brown-black (c) brown-red-brown (d) brown-brown-red
32. 32.True or false: on an LED, the shorter leg is the cathode (−). (a) True (b) False
33. 33.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 50 % (c) 0 % (d) 5 %
34. 34.🔍 Which is the odd one out? (a) a street light (b) a water heater (c) a toaster (d) a rice cooker
35. 35.✏️ In a circuit diagram, which part is drawn as a circle with a cross? (a) diode (b) bulb (c) wire (d) cell
36. 36.💡 An LED is joined to a 9 V battery through a 220 Ω resistor; the leg next to the flat edge of its rim goes to the + side. What happens? (a) does not light (b) may burn out (c) lights up
37. 37.🔁 repeat 3 times { repeat 5 times { beep } }
    How many beeps are there?
38. 38.Which of these is a risky habit? (a) share the Wi-Fi key (b) read app permissions (c) change default passwords (d) log out of shared phones
39. 39.🔦 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
40. 40.🤖 What is a microcontroller? (a) a kind of bulb (b) a computer on one chip (c) a big desktop computer (d) a type of battery

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