Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 594 · 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.💡 3 identical bulbs are in parallel and each one takes 0.5 A. What total current (in amperes) comes from the battery? =
2. 2.🔺 A current of 10 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
3. 3.True or false: to read app permissions is a good habit. (a) False (b) True
4. 4.🔋 A 12 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
5. 5.✏️ In a cell symbol, which line is the + terminal? (a) neither line (b) both lines (c) the longer line (d) the shorter line
6. 6.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
7. 7.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
8. 8.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
9. 9.Which of these is an input? (a) a push button (b) a speaker (c) an LED (d) a buzzer
10. 10.🔺 A current of 1 A flows when 8 V is joined across a resistor. What is its resistance (in ohms)?
11. 11.Which drawing is the symbol for a bulb? (a) a circle with a cross (b) a straight line (c) triangle, bar and arrows (d) a plain rectangle
12. 12.🔐 Which is the strongest password for a home smart camera? (a) Tiger#Lamp42!Moon (b) password (c) 123456 (d) admin
13. 13.🔺 A 2.2 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
14. 14.🔺 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
15. 15.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 141. What happens? (a) lamp OFF (b) lamp ON
16. 16.True or false: to share the Wi-Fi key is a risky habit. (a) False (b) True
17. 17.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
18. 18.⏱️ How many milliseconds is a wait of 1.9 seconds?
19. 19.🔁 count = 8
    repeat 8 times { count = count + 10 }
    What is count at the end?
20. 20.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
21. 21.🔘 Which kind of switch springs back when let go? (a) a slide switch (b) a tilt switch (c) a reed switch (d) a push button
22. 22.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False
23. 23.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
24. 24.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
25. 25.🔺 A current of 3 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
26. 26.🌈 In the resistor colour code, which number does blue stand for?
27. 27.🔁 count = 4
    repeat 8 times { count = count + 10 }
    What is count at the end?
28. 28.Which of these is the input? (a) an alert on the phone (b) the fan starts (c) an LED lights up (d) a light level reading
29. 29.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
30. 30.Which of these is a good habit? (a) share camera links (b) turn off unused gadgets (c) tap unknown app links (d) reuse one password
31. 31.🔺 A current of 1 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
32. 32.🌈 Which band is read first on a resistor? (a) the gold band (b) any band (c) the one nearest an end (d) the widest gap
33. 33.🔺 A current of 40 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
34. 34.🔺 A current of 1.5 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
35. 35.🔁 x = 4
    repeat 4 times { x = x × 2 }
    What is x at the end?
36. 36.🔢 To plan an electronics project, which is the FIRST step? (a) pick a problem to solve (b) list inputs and outputs (c) build it with an adult (d) test it and fix it
37. 37.✏️ In a circuit diagram, which part is drawn as a circle with V inside? (a) voltmeter (b) cell (c) LED (d) bulb
38. 38.Which of these is not safe? (a) fly kites in open fields (b) build with an adult near (c) poke things in a socket (d) keep drinks far away
39. 39.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) dotted circles (c) little stars (d) straight lines
40. 40.🧩 Which component lets current go one way? (a) LED (b) fuse (c) diode (d) capacitor

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