Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 724 · 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.🔁 total = 0
   for i = 1 to 5 { total = total + i }
   What is total at the end?
2. 2.What does a resistor do? (a) limits the current (b) boosts a small signal (c) senses how hot it is (d) senses how bright it is
3. 3.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: a steel coin is a conductor. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a metal paper clip (b) a safety pin (c) a plastic ruler (d) a brass key
6. 6.🔍 Which is the odd one out? (a) climb an electric pole (b) touch a fallen wire (c) build with an adult near (d) throw cells in a fire
7. 7.🔁 total = 0
   for i = 1 to 11 { total = total + i }
   What is total at the end?
8. 8.🔁 What does “count = count + 1” do? (a) adds 1 to count (b) prints 1 (c) sets count to 1 (d) takes 1 away
9. 9.True or false: on an LED, the round-side leg is the cathode (−). (a) False (b) True
10. 10.What does a motor do? (a) senses how hot it is (b) senses how bright it is (c) has coloured bands (d) turns a fan or wheels
11. 11.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 402. What happens? (a) lamp ON (b) lamp OFF
12. 12.True or false: triangle, bar and arrows is the symbol for a cell. (a) False (b) True
13. 13.🔺 A current of 3 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
14. 14.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
15. 15.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
16. 16.📏 Which unit measures how much a part resists? (a) ampere (A) (b) ohm (Ω) (c) volt (V) (d) watt (W)
17. 17.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) the longer line (d) both lines
18. 18.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) only one (b) both of them (c) it does not matter (d) none
19. 19.📏 How many kilo-ohms (kΩ) is 5000 Ω? =
20. 20.What does a push button do? (a) closes when tipped over (b) works only while pressed (c) stays where you flip it (d) flips up or down
21. 21.🔢 To plan an electronics project, what comes right after “list inputs and outputs”? (a) build it with an adult (b) draw the circuit diagram (c) pick a problem to solve (d) test it and fix it
22. 22.🤖 Microcontroller or laptop: which one runs many apps at once? (a) microcontroller (b) laptop
23. 23.⚡ What does a torch mainly change electricity into? (a) sound (b) heat (c) movement (d) light
24. 24.What does a push button do? (a) closes when tipped over (b) flips up or down (c) springs back when let go (d) stays where you flip it
25. 25.🔁 x = 2
    repeat 2 times { x = x × 2 }
    What is x at the end?
26. 26.🔺 A current of 20 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
27. 27.True or false: two or more cell symbols is the symbol for a switch. (a) True (b) False
28. 28.🔁 x = 2
    repeat 1 time { x = x × 2 }
    What is x at the end?
29. 29.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) switch (b) cell (c) voltmeter (d) diode
30. 30.Which job needs an LED? (a) spin a robot’s wheels (b) show a status light (c) move water to plants (d) beep an alarm
31. 31.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
32. 32.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 220 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
33. 33.🧮 A 50 Ω resistor is joined in series with two equal 10 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
34. 34.⚡ Power tells us … (a) energy used each second (b) the length of a wire (c) the colour of light (d) the size of a cell
35. 35.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 4 of the switches are OFF and the rest are ON. How many bulbs glow?
36. 36.🌐 In an IoT system, which part acts on a command? (a) Wi-Fi (b) actuator (c) phone app (d) cloud server
37. 37.True or false: to reuse one password is a risky habit. (a) True (b) False
38. 38.🔺 A current of 10 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
39. 39.🔍 Which is the odd one out? (a) decide if soil is dry (b) count button presses (c) check if temp > 30 (d) a button press
40. 40.True or false: “many paths for current” is true of a series circuit. (a) True (b) False

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