Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 351 · 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: “own switch for each bulb” is true of a parallel circuit. (a) True (b) False
2. 2.🔁 count = 5
   while (count < 21) { count = count + 2 }
   How many times does the loop run?
3. 3.True or false: a safety pin is a conductor. (a) True (b) False
4. 4.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. How many bulbs glow?
5. 5.🔁 count = 3
   repeat 6 times { count = count + 6 }
   What is count at the end?
6. 6.🗺️ In an input → process → output plan, is “the fan starts” the input, the process or the output? (a) process (b) input (c) output
7. 7.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
8. 8.🤖 Where does the board keep its program when the power is off? (a) the USB cable (b) flash memory (c) the resistor (d) the power LED
9. 9.🔋 How many 1.2 V cells must be joined in series to give 6 V?
10. 10.🔺 A 12 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =
11. 11.True or false: to set a strong password is a good habit. (a) False (b) True
12. 12.Which job is done by the pins? (a) connect sensors and LEDs (b) runs the program (c) brings power and code (d) restarts the program
13. 13.📏 In the water-pipe picture of a circuit, voltage is like … (a) the water pressure (b) the tap handle (c) the pipe colour (d) the water tank lid
14. 14.🤖 Which is a safe power source for a beginner microcontroller board? (a) a wall socket directly (b) bare mains wires (c) a 230 V cable (d) USB or a 9 V battery
15. 15.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) True (b) False
16. 16.🌈 Which band is read first on a resistor? (a) any band (b) the gold band (c) the one nearest an end (d) the widest gap
17. 17.🔋 6 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
18. 18.Which of these mainly makes movement? (a) a street light (b) a torch (c) an exhaust fan (d) an LED lamp
19. 19.Which of these means the circuit is open? (a) the loop is complete (b) a wire is cut (c) the switch is ON (d) all wires are joined
20. 20.⚠️ Is it safe to keep drinks far away? (a) not safe (b) safe
21. 21.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
22. 22.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) becomes zero (c) gets smaller (d) stays the same
23. 23.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) both lines (d) the longer line
24. 24.🧮 Two resistors in parallel give a total that is … (a) their sum (b) more than either one (c) less than either one (d) always zero
25. 25.What does a toggle switch do? (a) slides side to side (b) closes when tipped over (c) flips up or down (d) works only while pressed
26. 26.True or false: to share the Wi-Fi key is a risky habit. (a) False (b) True
27. 27.Which of these is a conductor? (a) a metal paper clip (b) a glass marble (c) a rubber band (d) a plastic ruler
28. 28.🔺 A current of 3 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
29. 29.True or false: if the loop is complete, the circuit is open and no current flows. (a) False (b) True
30. 30.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) LED (b) capacitor (c) bulb (d) voltmeter
31. 31.🔍 Which is the odd one out? (a) turn off unused gadgets (b) share the Wi-Fi key (c) read app permissions (d) change default passwords
32. 32.🔢 To plan an electronics project, what comes right after “pick a problem to solve”? (a) draw the circuit diagram (b) test it and fix it (c) build it with an adult (d) list inputs and outputs
33. 33.🔁 repeat 2 times { repeat 4 times { beep } }
    How many beeps are there?
34. 34.🔺 A current of 20 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
35. 35.🔋 7 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
36. 36.True or false: “a buzzer beeps” is the input. (a) False (b) True
37. 37.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they explode (c) they keep glowing (d) they all go out
38. 38.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
39. 39.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
40. 40.Which of these means the circuit is closed? (a) a cell is taken out (b) a wire has come loose (c) the switch is OFF (d) the loop is complete

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