Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 119 · 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.🔋 5 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)? =
3. 3.💡 A battery lights 3 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
4. 4.🔺 A current of 0.1 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
5. 5.True or false: “a temperature reading” is the output. (a) False (b) True
6. 6.🔌 Most metals are good … (a) conductors (b) insulators (c) batteries (d) magnets only
7. 7.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) False (b) True
8. 8.True or false: on an LED, the longer leg is the cathode (−). (a) False (b) True
9. 9.True or false: a circle with an X in it is the symbol for a bulb. (a) True (b) False
10. 10.🔺 A 16.5 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
11. 11.True or false: power is measured in volts (V). (a) True (b) False
12. 12.True or false: to set up with a parent is a good habit. (a) True (b) False
13. 13.🌐 Is a Wi-Fi weather station an IoT device? (a) not an IoT device (b) an IoT device
14. 14.⏱️ How many milliseconds is a wait of 1.3 seconds?
15. 15.🔺 A 12 V supply is joined across a 300 Ω resistor. What current flows (in milliamperes, mA)?
16. 16.Which drawing is the symbol for a wire? (a) a circle with an X in it (b) a circle with M inside (c) a straight line (d) a plain rectangle
17. 17.💡 In a series circuit, how many paths does the current have? (a) two (b) none (c) one (d) one for each bulb
18. 18.🌐 Is a smart energy meter an IoT device? (a) not an IoT device (b) an IoT device
19. 19.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) the size of a cell (d) energy used each second
20. 20.🔋 Cells joined + to − in a row (series) give … (a) the same voltage (b) no voltage (c) a bigger voltage (d) a smaller voltage
21. 21.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) resistor (b) capacitor (c) wire (d) battery
22. 22.🔁 What must there be for a current to flow? (a) one loose end (b) a broken path (c) a plastic gap (d) a complete loop
23. 23.🔍 Which is the odd one out? (a) set a strong password (b) cover unused cameras (c) post your live location (d) read app permissions
24. 24.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) their sum (c) less than either one (d) always zero
25. 25.Which of these is true of a series circuit? (a) used in house wiring (b) a break stops every bulb (c) many paths for current (d) each gets the full volts
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
27. 27.🔌 Is a paper strip a conductor or an insulator? (a) a conductor (b) an insulator
28. 28.🔺 A current of 40 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
29. 29.🌈 A resistor has the colour bands violet, violet, red. What is its value in kilo-ohms (kΩ)? =
30. 30.True or false: the ammeter is joined in series. (a) False (b) True
31. 31.⚡ What does a school bell mainly change electricity into? (a) heat (b) sound (c) movement (d) light
32. 32.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
33. 33.🔍 Which is the odd one out? (a) a tube light (b) a traffic signal (c) a torch (d) a buzzer
34. 34.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = I ÷ V (d) P = V + I
35. 35.🔋 Does a cell give electricity or use electricity? (a) gives electricity (b) uses electricity
36. 36.🔘 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 ON and C is OFF. Does the bulb glow? (a) No (b) Yes
37. 37.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) bigger (c) stay the same (d) zero
38. 38.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.Which drawing is the symbol for an LED? (a) triangle, bar and arrows (b) two equal parallel lines (c) a circle with A inside (d) a straight line
40. 40.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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