Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 885 · 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.📏 In the water-pipe picture of a circuit, current is like … (a) the pipe colour (b) the water pressure (c) the flow of water (d) a narrow pipe
2. 2.🗺️ In an input → process → output plan, is “check if temp > 30” the input, the process or the output? (a) output (b) input (c) process
3. 3.⏱️ loop forever { LED ON; wait 800 ms; LED OFF; wait 550 ms }
   How many milliseconds does one blink (ON + OFF) take?
4. 4.🔍 Which is the odd one out? (a) a steel coin (b) a steel spoon (c) a paper strip (d) a metal paper clip
5. 5.Which of these is an input? (a) a motor (b) a motion sensor (c) a servo motor (d) a speaker
6. 6.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel spoon across the gap. Does the bulb glow? (a) No (b) Yes
7. 7.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) energy used each second (d) the size of a cell
8. 8.🔐 Privacy for a smart device means controlling … (a) its colour (b) how loud it beeps (c) its battery size (d) who can see your data
9. 9.Which of these mainly makes movement? (a) a street light (b) an LED lamp (c) a table fan (d) a room heater
10. 10.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
11. 11.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown? (a) Hot (b) Warm (c) Cool
12. 12.✏️ In a circuit diagram, which part is drawn as many long-short pairs? (a) capacitor (b) junction (c) switch (d) battery
13. 13.📏 Voltmeter or ammeter: which one measures voltage? (a) ammeter (b) voltmeter
14. 14.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a keypad (d) an LED
15. 15.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) the shorter line (c) the longer line (d) neither line
16. 16.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
17. 17.True or false: a safety pin is a conductor. (a) True (b) False
18. 18.⚡ What does a traffic signal mainly change electricity into? (a) light (b) sound (c) movement (d) heat
19. 19.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
20. 20.What does a buzzer do? (a) makes a beeping sound (b) blows if current is high (c) senses how bright it is (d) turns a fan or wheels
21. 21.🔘 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 OFF, B is ON and C is OFF. Does the bulb glow? (a) No (b) Yes
22. 22.💡 4 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
23. 23.True or false: a laptop uses very little power. (a) True (b) False
24. 24.Which drawing is the symbol for a switch? (a) a line lifted at a gap (b) triangle against a bar (c) a circle with a cross (d) a straight line
25. 25.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) never (b) only when both are OFF (c) when either is ON (d) only when both are ON
26. 26.🧮 Three equal 75 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
27. 27.🔺 A current of 3 A flows when 60 V is joined across a resistor. What is its resistance (in ohms)?
28. 28.Which of these is true of a parallel circuit? (a) a single current path (b) bulbs share the voltage (c) one bulb out, all go out (d) one out, the rest glow
29. 29.True or false: a tilt switch closes when tipped over. (a) True (b) False
30. 30.What does a reed switch do? (a) closes near a magnet (b) works only while pressed (c) slides side to side (d) springs back when let go
31. 31.🔢 To run one loop of a plant-watering program, which is the FIRST step? (a) read the soil sensor (b) compare with the limit (c) wait a few seconds (d) switch the pump on/off
32. 32.🤖 Microcontroller or laptop: which one uses very little power? (a) laptop (b) microcontroller
33. 33.⚠️ Is it safe to open a phone charger? (a) safe (b) not safe
34. 34.🔢 To plan an electronics project, what comes right after “build it with an adult”? (a) list inputs and outputs (b) pick a problem to solve (c) draw the circuit diagram (d) test it and fix it
35. 35.Which drawing is the symbol for a battery? (a) a dot where wires meet (b) a line lifted at a gap (c) two or more cell symbols (d) two equal parallel lines
36. 36.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
37. 37.Which of these is not safe? (a) fly kites in open fields (b) open a phone charger (c) dry your hands first (d) stop if a part gets hot
38. 38.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
39. 39.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.Which of these is measured in volts (V)? (a) the flow of charge (b) the push of a cell (c) power (d) current

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