Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 175 · 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.🤖 “if (A AND B)” is true when … (a) only A is true (b) both A and B are true (c) only B is true (d) both are false
2. 2.🔁 repeat 4 times { repeat 5 times { beep } }
   How many beeps are there?
3. 3.🔁 What does a variable do in a program? (a) blinks an LED (b) joins two wires (c) stores a value (d) measures light
4. 4.True or false: if a wire is cut, the circuit is closed and current flows. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) share only needed data (b) read app permissions (c) install software updates (d) ignore update messages
6. 6.What does the cloud server do? (a) measures the real world (b) acts on a command (c) stores data online (d) reads values, decides
7. 7.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
8. 8.🔺 An 8 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
9. 9.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) False (b) True
10. 10.🏠 Which is a smart-home example? (a) lights on from an app (b) a printed map (c) a hand fan (d) a candle in a jar
11. 11.🔢 To get a sensor reading onto a phone, what comes right after “the sensor measures”? (a) the cloud stores it (b) the board reads it (c) it is sent by Wi-Fi (d) the app shows it
12. 12.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
13. 13.⚠️ Is it safe to poke things in a socket? (a) safe (b) not safe
14. 14.🔍 Which is the odd one out? (a) tap unknown app links (b) install software updates (c) accept every permission (d) ignore update messages
15. 15.🧩 Which component limits the current? (a) transistor (b) fuse (c) potentiometer (d) resistor
16. 16.💡 An LED is joined to a 9 V battery with no resistor; the leg next to the flat edge of its rim goes to the − side. What happens? (a) lights up (b) may burn out (c) does not light
17. 17.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 320 Ω resistor? (a) orange-red-brown (b) red-orange-brown (c) orange-red-red (d) orange-red-black
18. 18.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 190 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
19. 19.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
20. 20.🔦 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) No (b) Yes
21. 21.🧩 Which part changes electrical energy into sound? (a) a buzzer (b) a capacitor (c) a resistor (d) a diode
22. 22.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) resistor (b) junction (c) battery (d) cell
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
24. 24.🤖 if (sound > 80) { red LED ON } else { green LED ON }
    The sound sensor reads 73. What happens? (a) green LED ON (b) red LED ON
25. 25.📏 Which unit measures resistance? (a) volt (V) (b) watt (W) (c) ampere (A) (d) ohm (Ω)
26. 26.🧮 A 2.25 V battery is joined to 5 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
27. 27.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
28. 28.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) straight lines (c) dotted circles (d) little stars
29. 29.Which of these is true of a series circuit? (a) many paths for current (b) used in house wiring (c) one out, the rest glow (d) a single current path
30. 30.🔢 To plan an electronics project, which is the FIRST step? (a) test it and fix it (b) list inputs and outputs (c) draw the circuit diagram (d) pick a problem to solve
31. 31.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the filament (b) the switch (c) the glass (d) the base
32. 32.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) ammeter (b) battery (c) capacitor (d) wire
33. 33.🔁 x = 2
    repeat 1 time { x = x × 2 }
    What is x at the end?
34. 34.⚡ Which tiny particles drift along a metal wire to carry the current? (a) photons (b) water drops (c) electrons (d) dust particles
35. 35.🔋 2 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
36. 36.Which drawing is the symbol for an ammeter? (a) triangle, bar and arrows (b) a circle with A inside (c) a long and a short line (d) one tall, one short bar
37. 37.🔋 How many 1.2 V cells must be joined in series to give 7.2 V?
38. 38.🤖 Does a hand pump usually have a microcontroller inside? (a) No (b) Yes
39. 39.🔍 Which is the odd one out? (a) cover unused cameras (b) read app permissions (c) set a strong password (d) tap unknown app links
40. 40.⏱️ repeat 10 times { buzzer ON; wait 100 ms; buzzer OFF; wait 400 ms }
    How many milliseconds does this take in all?

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