Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 371 · 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: if a wire is cut, the circuit is closed and current flows. (a) True (b) False
2. 2.🔁 repeat 6 times { repeat 4 times { beep } }
   How many beeps are there?
3. 3.True or false: a laptop runs one small program. (a) True (b) False
4. 4.Which job is done by the power LED? (a) keeps the voltage steady (b) shows the board is on (c) brings power and code (d) connect sensors and LEDs
5. 5.Which job is done by the reset button? (a) brings power and code (b) keeps the voltage steady (c) runs the program (d) restarts the program
6. 6.Which of these is an output? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) a servo motor
7. 7.🌐 A weather station sends one reading every 15 seconds. How many readings does it send in 5 minutes?
8. 8.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 10 (c) 1000 (d) 100
9. 9.🔋 Does a computer give electricity or use electricity? (a) gives electricity (b) uses electricity
10. 10.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
11. 11.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
12. 12.📏 Which unit measures power? (a) ampere (A) (b) volt (V) (c) watt (W) (d) ohm (Ω)
13. 13.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
14. 14.🔁 x = 2
    repeat 4 times { x = x × 2 }
    What is x at the end?
15. 15.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 10 °C. What is shown? (a) Warm (b) Cool (c) Hot
16. 16.🌈 In the resistor colour code, which number does yellow stand for?
17. 17.🔁 repeat 2 times { repeat 3 times { beep } }
    How many beeps are there?
18. 18.🔍 Which is the odd one out? (a) a doorbell (b) a night lamp (c) a traffic signal (d) a torch
19. 19.🧩 Which component stores a little charge? (a) motor (b) buzzer (c) resistor (d) capacitor
20. 20.🗺️ In an input → process → output plan, is “count button presses” the input, the process or the output? (a) input (b) output (c) process
21. 21.Which of these is true of a parallel circuit? (a) a single current path (b) many paths for current (c) a break stops every bulb (d) one bulb out, all go out
22. 22.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly
23. 23.🔋 5 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
24. 24.🧮 Two equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
25. 25.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
26. 26.🧮 Resistors of 10 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
27. 27.True or false: to set up with a parent is a risky habit. (a) True (b) False
28. 28.⚡ A cell changes stored chemical energy into which kind of energy? (a) electrical energy (b) sound energy (c) nuclear energy (d) wind energy
29. 29.🔐 Which is the strongest password for a home smart camera? (a) admin (b) 123456 (c) Tiger#Lamp42!Moon (d) password
30. 30.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 390 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
31. 31.Which of these is an insulator? (a) a safety pin (b) aluminium foil (c) a woollen thread (d) a copper wire
32. 32.True or false: a plastic straw is a conductor. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) a dry cork (b) a paper strip (c) a brass key (d) a woollen thread
34. 34.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel coin across the gap. Does the bulb glow? (a) Yes (b) No
35. 35.Which drawing is the symbol for a motor? (a) a circle with M inside (b) a line lifted at a gap (c) a long and a short line (d) two equal parallel lines
36. 36.Which drawing is the symbol for a battery? (a) a plain rectangle (b) many long-short pairs (c) triangle, bar and arrows (d) one tall, one short bar
37. 37.Which of these means the circuit is closed? (a) the switch is ON (b) a cell is taken out (c) a wire has come loose (d) the bulb is unscrewed
38. 38.⚠️ Is it safe to stay away from pylons? (a) not safe (b) safe
39. 39.True or false: if all wires are joined, the circuit is open and no current flows. (a) True (b) False
40. 40.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) battery (b) motor (c) LED (d) capacitor

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