Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 703 · 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 all wires are joined, the circuit is closed and current flows. (a) True (b) False
2. 2.🔌 Most metals are good … (a) batteries (b) insulators (c) magnets only (d) conductors
3. 3.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) blinks 500 times (c) turns the LED off (d) pauses for half a second
4. 4.Which drawing is the symbol for a capacitor? (a) a plain rectangle (b) a straight line (c) one tall, one short bar (d) two equal parallel lines
5. 5.Which drawing is the symbol for a junction? (a) a circle with a cross (b) a line lifted at a gap (c) a dot where wires meet (d) two or more cell symbols
6. 6.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) bigger (c) smaller (d) stay the same
7. 7.🔺 A current of 0.5 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
8. 8.Which of these is an input? (a) a temperature sensor (b) an LED (c) a motor (d) a water pump
9. 9.🌐 In an IoT system, which part acts on a command? (a) actuator (b) Wi-Fi (c) phone app (d) sensor
10. 10.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
11. 11.Which of these is true of a series circuit? (a) one out, the rest glow (b) own switch for each bulb (c) each gets the full volts (d) a break stops every bulb
12. 12.Which job needs a display? (a) open a gate to 90° (b) beep an alarm (c) show the temperature (d) turn to an exact angle
13. 13.🌈 A resistor has the colour bands yellow, red, red. What is its value in kilo-ohms (kΩ)? =
14. 14.True or false: if a cell is taken out, the circuit is closed and current flows. (a) False (b) True
15. 15.True or false: a resistor blows if current is high. (a) True (b) False
16. 16.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a cotton thread. Does the bulb glow? (a) No (b) Yes
17. 17.True or false: a TV remote has no microcontroller inside. (a) False (b) True
18. 18.True or false: on a cell, “the flat end” means the + (positive) end. (a) True (b) False
19. 19.⚠️ Is it safe to dry your hands first? (a) not safe (b) safe
20. 20.📏 How many milliamperes (mA) is 1.35 A?
21. 21.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 600 ms }
    How many milliseconds does one blink (ON + OFF) take?
22. 22.🔺 A current of 0.2 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
23. 23.🔋 What is a battery? (a) a switch with a lid (b) one single wire (c) a kind of bulb (d) two or more cells joined
24. 24.Which of these is true of a series circuit? (a) one out, the rest glow (b) used in house wiring (c) many paths for current (d) a single current path
25. 25.What does a slide switch do? (a) stays where you flip it (b) works only while pressed (c) flips up or down (d) slides side to side
26. 26.🔺 A current of 1 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
27. 27.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) True (b) False
28. 28.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) both of them (b) only one (c) none (d) it does not matter
29. 29.🔐 Is it a good or a risky habit to share only needed data? (a) risky habit (b) good habit
30. 30.🧩 A capacitor in a circuit can … (a) store charge briefly (b) spin a wheel (c) measure heat (d) make light
31. 31.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
32. 32.🌐 What does IoT stand for? (a) Input of Tools (b) Internet of Talk (c) Inside of Toys (d) Internet of Things
33. 33.🔗 Series or parallel circuit: “used in house wiring”? (a) parallel (b) series
34. 34.True or false: an electric iron mainly makes sound. (a) True (b) False
35. 35.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) one out, the rest glow (c) one bulb out, all go out (d) a single current path
36. 36.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) closed (b) open
37. 37.🔋 How many 1.2 V cells must be joined in series to give 6 V?
38. 38.🌈 Which band is read first on a resistor? (a) the one nearest an end (b) the gold band (c) any band (d) the widest gap
39. 39.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the process (b) the input (c) the battery (d) the output
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open

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