Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 585 · 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 is the odd one out? (a) a steel coin (b) a dry cork (c) aluminium foil (d) an iron nail
2. 2.🔋 How many 1.2 V cells must be joined in series to give 3.6 V?
3. 3.🔁 What does “count = count + 1” do? (a) sets count to 1 (b) prints 1 (c) adds 1 to count (d) takes 1 away
4. 4.Which job needs a buzzer? (a) show the temperature (b) open a gate to 90° (c) turn to an exact angle (d) beep an alarm
5. 5.🔌 Why are electric wires covered in plastic? (a) plastic makes current (b) plastic is a conductor (c) plastic is an insulator (d) to make them heavy
6. 6.Which of these is a risky habit? (a) accept every permission (b) change default passwords (c) read app permissions (d) install software updates
7. 7.⏱️ How many milliseconds is a wait of 1.1 seconds?
8. 8.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) capacitor (b) bulb (c) resistor (d) battery
9. 9.🔢 To get a sensor reading onto a phone, which comes first: “the board reads it” or “the app shows it”? (a) the app shows it (b) the board reads it
10. 10.🔢 To get a sensor reading onto a phone, which comes first: “the sensor measures” or “the app shows it”? (a) the sensor measures (b) the app shows it
11. 11.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 17 °C. What is shown? (a) Warm (b) Cool (c) Hot
12. 12.🔁 What does a variable do in a program? (a) blinks an LED (b) measures light (c) joins two wires (d) stores a value
13. 13.🔺 An 11 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
14. 14.🔍 Which is the odd one out? (a) a Wi-Fi weather station (b) a plain wall switch (c) a battery torch (d) a plain table fan
15. 15.True or false: to stay away from pylons is not safe. (a) True (b) False
16. 16.⏱️ A program says “wait 10000 ms”. How many seconds is that? =
17. 17.🤖 “if (A AND B)” is true when … (a) both are false (b) only B is true (c) both A and B are true (d) only A is true
18. 18.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 41 °C. What is shown? (a) Cool (b) Hot (c) Warm
19. 19.True or false: a laptop runs one small program. (a) True (b) False
20. 20.Which of these mainly makes sound? (a) a traffic signal (b) a table fan (c) an LED lamp (d) a doorbell
21. 21.⏱️ A program says “wait 250 ms”. How many seconds is that? =
22. 22.🔍 Which is the odd one out? (a) a battery torch (b) an app-controlled bulb (c) a plain wall switch (d) a plain table fan
23. 23.🧮 Resistors of 20 Ω, 10 Ω, 22 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
24. 24.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown? (a) Warm (b) Hot (c) Cool
25. 25.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) True (b) False
26. 26.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 1000 (c) 10 (d) 60
27. 27.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
28. 28.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) LED (b) battery (c) switch (d) diode
29. 29.True or false: “check if temp > 30” is the output. (a) True (b) False
30. 30.🔦 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) No (b) Yes
31. 31.True or false: a wooden stick is a conductor. (a) False (b) True
32. 32.Which of these is a risky habit? (a) keep factory passwords (b) read app permissions (c) share only needed data (d) log out of shared phones
33. 33.🔍 Which is the odd one out? (a) a buzzer (b) a push button (c) a turning knob (d) a keypad
34. 34.🔺 A current of 50 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
35. 35.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
36. 36.🤖 Microcontroller or laptop: which one has no screen of its own? (a) microcontroller (b) laptop
37. 37.Which of these is not safe? (a) touch a fallen wire (b) fly kites in open fields (c) use small battery cells (d) dry your hands first
38. 38.Which of these is safe? (a) fly a kite near wires (b) build with an adult near (c) throw cells in a fire (d) touch a fallen wire
39. 39.🔺 A current of 50 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
40. 40.True or false: to post your live location is a risky habit. (a) False (b) True

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