Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 739 · 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.🔁 repeat 6 times { repeat 2 times { beep } }
   How many beeps are there?
2. 2.Which of these mainly gives out light? (a) a siren (b) a doorbell (c) a school bell (d) a street light
3. 3.True or false: to read app permissions is a good habit. (a) False (b) True
4. 4.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 260 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
5. 5.⏱️ How many milliseconds is a wait of 2.4 seconds?
6. 6.True or false: “one out, the rest glow” is true of a series circuit. (a) True (b) False
7. 7.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 200 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
8. 8.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
9. 9.🔦 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) Yes (b) No
10. 10.🔘 A cell and a bulb are joined to 2 side-by-side paths with one switch on each path — A and B (parallel). A is ON and B is ON. Does the bulb glow? (a) No (b) Yes
11. 11.Which job is done by the USB port? (a) keeps the voltage steady (b) restarts the program (c) brings power and code (d) connect sensors and LEDs
12. 12.True or false: a toggle switch works only while pressed. (a) False (b) True
13. 13.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 50 % (c) 0 % (d) 5 %
14. 14.🔍 Which is the odd one out? (a) stop if a part gets hot (b) throw cells in a fire (c) fly a kite near wires (d) open a phone charger
15. 15.🔺 In the V-I-R triangle, how do we find I? (a) I = V × R (b) I = R ÷ V (c) I = V + R (d) I = V ÷ R
16. 16.📶 Digital or analog: the room temperature? (a) analog (b) digital
17. 17.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) quick and clear for all (c) to hide the circuit (d) to make it colourful
18. 18.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 299. What happens? (a) lamp ON (b) lamp OFF
19. 19.True or false: an electric iron mainly gives out light. (a) False (b) True
20. 20.True or false: a copper wire is a conductor. (a) True (b) False
21. 21.🔦 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 steel coin. Does the bulb glow? (a) Yes (b) No
22. 22.💡 4 identical bulbs are in parallel and each bulb has its own switch on its path. 1 of the switches is OFF and the rest are ON. How many bulbs glow?
23. 23.True or false: to open a phone charger is safe. (a) True (b) False
24. 24.🧩 Which component lets current go one way? (a) diode (b) thermistor (c) LDR (d) fuse
25. 25.True or false: “used in house wiring” is true of a series circuit. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) a brass key (b) a cotton thread (c) a steel spoon (d) a safety pin
27. 27.True or false: many long-short pairs is the symbol for a battery. (a) True (b) False
28. 28.⚡ Which formula gives electric power? (a) P = V × I (b) P = V + I (c) P = I ÷ V (d) P = V ÷ I
29. 29.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) sound energy (b) movement energy (c) light energy (d) chemical energy
30. 30.🔋 What should you do with used-up cells? (a) give them for recycling (b) bury them in soil (c) cut them open (d) throw them in a fire
31. 31.True or false: a thermistor turns a fan or wheels. (a) True (b) False
32. 32.📏 How many milliamperes (mA) make 1 ampere? (a) 100 (b) 10 (c) 60 (d) 1000
33. 33.🔍 Which is the odd one out? (a) share camera links (b) install software updates (c) accept every permission (d) keep factory passwords
34. 34.🔺 A current of 0.2 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
35. 35.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they get dimmer (c) they explode (d) they keep glowing
36. 36.Which of these is a risky habit? (a) set a strong password (b) tap unknown app links (c) share only needed data (d) set up with a parent
37. 37.🔍 Which is the odd one out? (a) cover unused cameras (b) read app permissions (c) tap unknown app links (d) log out of shared phones
38. 38.True or false: to use LED lamps wastes electricity. (a) True (b) False
39. 39.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
40. 40.🧩 Which component has coloured bands? (a) LED (b) capacitor (c) motor (d) resistor

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