Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 694 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
2. 2.🔐 Is it a good or a risky habit to change default passwords? (a) risky habit (b) good habit
3. 3.🔋 8 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)? =
4. 4.🔁 count = 5
   repeat 5 times { count = count + 9 }
   What is count at the end?
5. 5.⚠️ Is it safe to touch a switch when wet? (a) safe (b) not safe
6. 6.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
7. 7.🧮 Two resistors in parallel give a total that is … (a) always zero (b) less than either one (c) their sum (d) more than either one
8. 8.🌈 In the resistor colour code, which number does grey stand for?
9. 9.What does a toggle switch do? (a) slides side to side (b) flips up or down (c) springs back when let go (d) works only while pressed
10. 10.True or false: on an LED, the longer leg is the anode (+). (a) True (b) False
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
12. 12.🔁 total = 0
    for i = 1 to 5 { total = total + i }
    What is total at the end?
13. 13.Which job needs a pump? (a) beep an alarm (b) open a gate to 90° (c) show the temperature (d) move water to plants
14. 14.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
15. 15.⏱️ What does “wait 500 ms” do? (a) pauses for half a second (b) waits 500 seconds (c) turns the LED off (d) blinks 500 times
16. 16.💡 5 identical bulbs are joined in series with a 10 V battery (ideal wires). How many volts does each bulb get? =
17. 17.🧮 Resistors of 330 Ω, 220 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
18. 18.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
19. 19.🔋 Does a solar panel give electricity or use electricity? (a) uses electricity (b) gives electricity
20. 20.💡 5 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
21. 21.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) to hide the circuit (c) to make it colourful (d) symbols are heavier
22. 22.🔗 Series or parallel circuit: “a single current path”? (a) series (b) parallel
23. 23.💡 6 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 1 and 2 are taken out of their holders. How many bulbs glow?
24. 24.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is OFF, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
25. 25.🔍 Which is the odd one out? (a) accept every permission (b) set a strong password (c) install software updates (d) change default passwords
26. 26.Which of these is the output? (a) a temperature reading (b) an LED lights up (c) a button press (d) a soil moisture reading
27. 27.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. How many bulbs glow?
28. 28.💡 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?
29. 29.True or false: a paper strip is a conductor. (a) False (b) True
30. 30.Which of these is measured in volts (V)? (a) the flow of charge (b) how much a part resists (c) power (d) voltage
31. 31.📏 In the water-pipe picture of a circuit, current is like … (a) the water pressure (b) the flow of water (c) a narrow pipe (d) the pipe colour
32. 32.🔁 count = 0
    while (count < 24) { count = count + 4 }
    How many times does the loop run?
33. 33.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 350 ms }
    How many times does the LED blink in 1 second?
34. 34.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True
35. 35.✏️ In a circuit diagram, which part is drawn as a circle with a cross? (a) bulb (b) switch (c) LED (d) resistor
36. 36.🔺 A current of 10 mA flows when 4.7 V is joined across a resistor. What is its resistance (in ohms)?
37. 37.True or false: on a cell, “the flat end” means the − (negative) end. (a) False (b) True
38. 38.⚡ Power tells us … (a) energy used each second (b) the colour of light (c) the size of a cell (d) the length of a wire
39. 39.🌈 A resistor has the colour bands green, orange, brown. What is its value (in ohms)?
40. 40.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 10 (c) 100 (d) 60

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