Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 160 · 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.True or false: current is measured in amperes (A). (a) True (b) False
2. 2.Which of these is a risky habit? (a) turn off unused gadgets (b) share only needed data (c) set a strong password (d) share the Wi-Fi key
3. 3.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 2 glow? (a) Yes (b) No
4. 4.📏 Which unit measures voltage? (a) volt (V) (b) ampere (A) (c) ohm (Ω) (d) watt (W)
5. 5.📏 Which unit measures the flow of charge? (a) ampere (A) (b) watt (W) (c) ohm (Ω) (d) volt (V)
6. 6.📶 Digital or analog: a tilt switch: on or off? (a) digital (b) analog
7. 7.⚡ A solar panel changes which kind of energy into electricity? (a) light energy (b) wind energy (c) sound energy (d) chemical energy
8. 8.True or false: “used in house wiring” is true of a series circuit. (a) True (b) False
9. 9.🔺 A current of 25 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
10. 10.🔘 A bulb and a cell are joined through 3 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
11. 11.Which of these is a risky habit? (a) share only needed data (b) install software updates (c) accept every permission (d) turn off unused gadgets
12. 12.True or false: “a button: pressed or not” is an analog signal. (a) False (b) True
13. 13.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
14. 14.🔗 Series or parallel circuit: “many paths for current”? (a) series (b) parallel
15. 15.True or false: to install software updates is a risky habit. (a) False (b) True
16. 16.⏱️ A program says “wait 1000 ms”. How many seconds is that? =
17. 17.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 5 of the switches are OFF and the rest are ON. How many bulbs glow?
18. 18.🔍 Which is the odd one out? (a) build with an adult near (b) stay away from pylons (c) fly a kite near wires (d) dry your hands first
19. 19.🌈 A resistor has the colour bands violet, white, yellow. What is its value in kilo-ohms (kΩ)? =
20. 20.✏️ In a circuit diagram, wires are usually drawn as … (a) little stars (b) straight lines (c) dotted circles (d) wavy lines
21. 21.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 560 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
22. 22.🤖 Microcontroller or laptop: which one runs many apps at once? (a) microcontroller (b) laptop
23. 23.🗺️ In an input → process → output plan, is “a temperature reading” the input, the process or the output? (a) output (b) input (c) process
24. 24.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
25. 25.⚠️ Is it safe to stay away from pylons? (a) not safe (b) safe
26. 26.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) cell (b) capacitor (c) motor (d) diode
27. 27.🌈 A resistor has the colour bands blue, grey, orange. What is its value in kilo-ohms (kΩ)? =
28. 28.🔋 5 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
30. 30.🔺 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
31. 31.⚠️ Is it safe to take cells out after use? (a) safe (b) not safe
32. 32.🔺 A 3 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
33. 33.True or false: a microwave oven has no microcontroller inside. (a) False (b) True
34. 34.🔋 Identical cells side by side (in parallel) give … (a) half the voltage (b) no voltage (c) double the voltage (d) the same voltage
35. 35.⚠️ Who should be with you when you build a circuit? (a) nobody (b) a younger child (c) a stranger online (d) a trusted adult
36. 36.True or false: on an LED, the shorter leg is the cathode (−). (a) True (b) False
37. 37.💡 What does LED stand for? (a) light energy dial (b) large electric dial (c) low energy device (d) light-emitting diode
38. 38.📏 How many milliamperes (mA) is 2.11 A?
39. 39.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
40. 40.🔺 A 15 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =

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