Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 395 · 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.Which of these is a conductor? (a) a glass marble (b) a rubber band (c) a plastic ruler (d) a steel spoon
2. 2.🧩 Which part changes electrical energy into movement? (a) an LED (b) a resistor (c) a motor (d) a fuse
3. 3.What does a slide switch do? (a) stays where you flip it (b) closes near a magnet (c) slides side to side (d) flips up or down
4. 4.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) none (b) only one (c) both of them (d) it does not matter
5. 5.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
6. 6.🧩 Which component senses how hot it is? (a) thermistor (b) potentiometer (c) resistor (d) LED
7. 7.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
8. 8.🔘 When a switch is ON, the circuit is … (a) open (b) broken (c) cut (d) closed
9. 9.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) − (negative) (b) + (positive)
10. 10.🔘 Two switches are in series. When does the bulb glow? (a) never (b) when both are ON (c) when either is ON (d) when both are OFF
11. 11.True or false: “count button presses” is the output. (a) False (b) True
12. 12.What does an LED do? (a) has coloured bands (b) glows using little power (c) is a resistance knob (d) senses how hot it is
13. 13.True or false: to set up with a parent is a good habit. (a) True (b) False
14. 14.🔺 In the V-I-R triangle, how do we find R? (a) R = V + I (b) R = V × I (c) R = I ÷ V (d) R = V ÷ I
15. 15.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 19 °C. What is shown? (a) Cool (b) Warm (c) Hot
16. 16.🔍 Which is the odd one out? (a) climb an electric pole (b) stop if a part gets hot (c) fly kites in open fields (d) stay away from pylons
17. 17.⏱️ A program says “wait 1250 ms”. How many seconds is that? =
18. 18.🔌 Is a speaker an input or an output for a microcontroller? (a) input (b) output
19. 19.True or false: the push of a cell is measured in amperes (A). (a) False (b) True
20. 20.⚠️ Why must we never touch switches with wet hands? (a) water makes it cold (b) it spoils the paint (c) it is just untidy (d) water carries current
21. 21.🧮 A 68 Ω resistor is joined in series with two equal 100 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
22. 22.⚡ A solar panel changes which kind of energy into electricity? (a) wind energy (b) light energy (c) sound energy (d) chemical energy
23. 23.🔁 What does a variable do in a program? (a) stores a value (b) measures light (c) joins two wires (d) blinks an LED
24. 24.Which of these means the circuit is open? (a) the switch is ON (b) all wires are joined (c) the loop is complete (d) a wire has come loose
25. 25.What does a motor do? (a) makes a beeping sound (b) glows using little power (c) beeps for an alarm (d) makes things spin
26. 26.🌈 A gold fourth band on a resistor means the value may be off by … (a) 5 % (b) 50 % (c) 25 % (d) 0 %
27. 27.⏱️ What does “wait 500 ms” do? (a) pauses for half a second (b) turns the LED off (c) blinks 500 times (d) waits 500 seconds
28. 28.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) cell (b) battery (c) ammeter (d) bulb
29. 29.🤖 How does a new program get onto a microcontroller board? (a) sent by sound (b) drawn with a pen (c) typed on the chip (d) uploaded over USB
30. 30.⚠️ Is it safe to stop if a part gets hot? (a) not safe (b) safe
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
32. 32.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
33. 33.Which of these means the circuit is open? (a) all wires are joined (b) the switch is ON (c) the loop is complete (d) a wire is cut
34. 34.True or false: a slide switch slides side to side. (a) False (b) True
35. 35.🔗 Series or parallel circuit: “a single current path”? (a) series (b) parallel
36. 36.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
37. 37.🏠 Which is a smart-home example? (a) a printed map (b) lights on from an app (c) a hand fan (d) a candle in a jar
38. 38.⏱️ loop forever { LED ON; wait 700 ms; LED OFF; wait 300 ms }
    How many times does the LED blink in 5 seconds?
39. 39.🔍 Which is the odd one out? (a) a keypad (b) a turning knob (c) a servo motor (d) a temperature sensor
40. 40.Which of these is the output? (a) count button presses (b) a button press (c) the pump turns on (d) a temperature reading

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