Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 726 · 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: a brass key is a conductor. (a) True (b) False
2. 2.🔘 Which kind of switch stays where you flip it? (a) a slide switch (b) a tilt switch (c) a reed switch (d) a toggle switch
3. 3.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 10 (c) 60 (d) 1000
4. 4.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) neither part (c) the if part (d) both parts
5. 5.💡 4 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. Bulb 1 is taken out of its holder. How many bulbs glow?
6. 6.🔌 Is a plastic ruler a conductor or an insulator? (a) an insulator (b) a conductor
7. 7.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 1 glow? (a) No (b) Yes
8. 8.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
9. 9.True or false: to cover unused cameras is a risky habit. (a) False (b) True
10. 10.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
11. 11.📏 Which unit measures the flow of charge? (a) volt (V) (b) watt (W) (c) ampere (A) (d) ohm (Ω)
12. 12.⏱️ What does “wait 500 ms” do? (a) blinks 500 times (b) turns the LED off (c) waits 500 seconds (d) pauses for half a second
13. 13.📶 Digital or analog: the room temperature? (a) digital (b) analog
14. 14.⚡ Which formula gives electric power? (a) P = V + I (b) P = V × I (c) P = V ÷ I (d) P = I ÷ V
15. 15.⚡ What do we call a flow of electric charge through a wire? (a) a magnet (b) electric current (c) sound (d) friction
16. 16.True or false: energy used each second is measured in ohms (Ω). (a) True (b) False
17. 17.📶 How many states can a digital pin have? (a) ten (b) a thousand (c) one (d) two
18. 18.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
19. 19.Which of these is the output? (a) decide if soil is dry (b) the pump turns on (c) check if temp > 30 (d) count button presses
20. 20.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) less than either one (c) their sum (d) always zero
21. 21.Which of these is an IoT device? (a) a wind-up clock (b) a Wi-Fi smart plug (c) a paper calendar (d) a pencil sharpener
22. 22.🔁 count = 8
    repeat 9 times { count = count + 2 }
    What is count at the end?
23. 23.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) False (b) True
24. 24.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
25. 25.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
26. 26.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
27. 27.Which of these is a good habit? (a) share the Wi-Fi key (b) post your live location (c) reuse one password (d) read app permissions
28. 28.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) in parallel (c) by Wi-Fi (d) not joined
29. 29.True or false: “a single current path” is true of a series circuit. (a) False (b) True
30. 30.🔋 Does a computer give electricity or use electricity? (a) gives electricity (b) uses electricity
31. 31.Which of these is the input? (a) an LED lights up (b) a soil moisture reading (c) an alert on the phone (d) decide if soil is dry
32. 32.Which of these means the circuit is closed? (a) a wire is cut (b) a cell is taken out (c) the bulb is unscrewed (d) the switch is ON
33. 33.🔌 Is a safety pin a conductor or an insulator? (a) a conductor (b) an insulator
34. 34.🌐 A weather station sends one reading every 10 seconds. How many readings does it send in 8 minutes?
35. 35.🔺 A current of 20 mA flows when 2.4 V is joined across a resistor. What is its resistance (in ohms)?
36. 36.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a bulb (b) a plug top (c) a long wire (d) a fuse or MCB
37. 37.True or false: to post your live location is a good habit. (a) True (b) False
38. 38.True or false: “each gets the full volts” is true of a parallel circuit. (a) False (b) True
39. 39.🔁 repeat 2 times { repeat 5 times { beep } }
    How many beeps are there?
40. 40.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True

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