Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 836 · 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 is the odd one out? (a) a copper wire (b) a steel spoon (c) an iron nail (d) a glass marble
2. 2.⏱️ loop forever { LED ON; wait 1000 ms; LED OFF; wait 650 ms }
   How many milliseconds does one blink (ON + OFF) take?
3. 3.🌈 A resistor has the colour bands red, violet, orange. What is its value in kilo-ohms (kΩ)? =
4. 4.🔌 Is a glass marble a conductor or an insulator? (a) an insulator (b) a conductor
5. 5.🌈 In the resistor colour code, which number does red stand for?
6. 6.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the switch (b) the glass (c) the base (d) the filament
7. 7.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
8. 8.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) battery (b) resistor (c) capacitor (d) bulb
9. 9.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 5 % (c) 0 % (d) 50 %
10. 10.🔁 count = 2
    repeat 7 times { count = count + 4 }
    What is count at the end?
11. 11.🔋 Does a bicycle dynamo give electricity or use electricity? (a) uses electricity (b) gives electricity
12. 12.⚠️ Is it safe to fly kites in open fields? (a) not safe (b) safe
13. 13.🔁 count = 1
    repeat 7 times { count = count + 4 }
    What is count at the end?
14. 14.What does a push button do? (a) slides side to side (b) stays where you flip it (c) closes when tipped over (d) springs back when let go
15. 15.🔁 count = 0
    while (count < 8) { count = count + 2 }
    How many times does the loop run?
16. 16.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
17. 17.⚠️ Why must we never touch switches with wet hands? (a) it is just untidy (b) it spoils the paint (c) water makes it cold (d) water carries current
18. 18.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a light sensor
19. 19.True or false: a fuse turns a fan or wheels. (a) False (b) True
20. 20.What does a toggle switch do? (a) works only while pressed (b) stays where you flip it (c) springs back when let go (d) closes when tipped over
21. 21.True or false: a plain wall switch usually has a microcontroller inside. (a) True (b) False
22. 22.🧮 A 68 Ω resistor is joined in series with two equal 10 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
23. 23.True or false: aluminium foil is a conductor. (a) False (b) True
24. 24.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are ON (b) never (c) only when both are OFF (d) when either is ON
25. 25.Which of these is a conductor? (a) a rubber band (b) a ceramic cup (c) a wooden stick (d) a brass key
26. 26.True or false: a fuse blows if current is high. (a) False (b) True
27. 27.True or false: to read app permissions is a risky habit. (a) False (b) True
28. 28.True or false: to keep drinks far away is safe. (a) False (b) True
29. 29.🔌 Is a wooden stick a conductor or an insulator? (a) an insulator (b) a conductor
30. 30.Which job needs a motion sensor? (a) water a dry plant (b) switch on with a clap (c) make a parking alarm (d) spot someone walking in
31. 31.🔍 Which is the odd one out? (a) take cells out after use (b) touch a switch when wet (c) use small battery cells (d) stop if a part gets hot
32. 32.⏱️ loop forever { LED ON; wait 650 ms; LED OFF; wait 50 ms }
    How many milliseconds does one blink (ON + OFF) take?
33. 33.💡 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 1 is taken out of its holder. How many bulbs glow?
34. 34.Which of these is true of a series circuit? (a) many paths for current (b) one bulb out, all go out (c) used in house wiring (d) one out, the rest glow
35. 35.🔐 Is it a good or a risky habit to install software updates? (a) good habit (b) risky habit
36. 36.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
37. 37.🔍 Which is the odd one out? (a) a paper calendar (b) a Wi-Fi smart plug (c) a Wi-Fi doorbell camera (d) a smart energy meter
38. 38.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
39. 39.🔺 A current of 10 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
40. 40.True or false: to install software updates is a risky habit. (a) False (b) True

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