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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 105 · 40 questions
TalentJR

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.

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  1. 1.🔺 A 0.8 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
  2. 2.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) double the voltage (c) half the voltage (d) no voltage
  3. 3.🌐 A weather station sends one reading every 20 seconds. How many readings does it send in 2 minutes?
  4. 4.🧩 Which part changes electrical energy into movement? (a) a resistor (b) an LED (c) a motor (d) a fuse
  5. 5.🔍 Which is the odd one out? (a) a woollen thread (b) a glass marble (c) a paper strip (d) aluminium foil
  6. 6.🔍 Which is the odd one out? (a) share the Wi-Fi key (b) change default passwords (c) install software updates (d) turn off unused gadgets
  7. 7.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 100 ms }
    How many times does the LED blink in 6 seconds?
  8. 8.Which of these means the circuit is closed? (a) the switch is OFF (b) the bulb is unscrewed (c) the switch is ON (d) a wire has come loose
  9. 9.✏️ In a circuit diagram, wires are usually drawn as … (a) little stars (b) wavy lines (c) straight lines (d) dotted circles
  10. 10.🔁 What must there be for a current to flow? (a) a plastic gap (b) a broken path (c) one loose end (d) a complete loop
  11. 11.⏱️ loop forever { LED ON; wait 350 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 1 second?
  12. 12.🌐 Is a plain table fan an IoT device? (a) an IoT device (b) not an IoT device
  13. 13.🧮 Resistors of 22 Ω, 50 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
  14. 14.Which of these is measured in watts (W)? (a) energy used each second (b) resistance (c) voltage (d) current
  15. 15.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a safety pin. Does the bulb glow? (a) No (b) Yes
  16. 16.🗺️ In an input → process → output plan, is “the fan starts” the input, the process or the output? (a) output (b) process (c) input
  17. 17.🔗 Series or parallel circuit: “a single current path”? (a) series (b) parallel
  18. 18.🔌 Is aluminium foil a conductor or an insulator? (a) an insulator (b) a conductor
  19. 19.🔺 A 7.5 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  20. 20.True or false: to use daylight to read saves electricity. (a) False (b) True
  21. 21.⚠️ Is it safe to fly a kite near wires? (a) not safe (b) safe
  22. 22.Which of these is safe? (a) use mains for a project (b) touch a switch when wet (c) fly a kite near wires (d) dry your hands first
  23. 23.🔁 repeat 6 times { repeat 4 times { beep } }
    How many beeps are there?
  24. 24.🔍 Which is the odd one out? (a) a ceiling fan (b) a traffic signal (c) a tube light (d) a night lamp
  25. 25.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  26. 26.🔺 In the V-I-R triangle, how do we find R? (a) R = I ÷ V (b) R = V + I (c) R = V × I (d) R = V ÷ I
  27. 27.🔘 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) Yes (b) No
  28. 28.⚠️ Is it safe to fly kites in open fields? (a) not safe (b) safe
  29. 29.🔘 When a switch is ON, the circuit is … (a) broken (b) closed (c) open (d) cut
  30. 30.🔍 Which is the odd one out? (a) a steel coin (b) aluminium foil (c) a woollen thread (d) a graphite rod
  31. 31.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
  32. 32.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) both lines (d) the longer line
  33. 33.⏱️ repeat 3 times { buzzer ON; wait 1000 ms; buzzer OFF; wait 900 ms }
    How many milliseconds does this take in all?
  34. 34.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  35. 35.What does a reed switch do? (a) flips up or down (b) closes near a magnet (c) slides side to side (d) closes when tipped over
  36. 36.Which of these means the circuit is open? (a) the switch is ON (b) the loop is complete (c) a cell is taken out (d) all wires are joined
  37. 37.🧩 Which component senses how bright it is? (a) resistor (b) transistor (c) LDR (d) LED
  38. 38.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 30 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  39. 39.🔁 What does a variable do in a program? (a) joins two wires (b) measures light (c) stores a value (d) blinks an LED
  40. 40.🔁 count = 9
    repeat 9 times { count = count + 5 }
    What is count at the end?

Answer key

  1. 0.1
  2. the same voltage
  3. 6
  4. a motor
  5. aluminium foil
  6. share the Wi-Fi key
  7. 24
  8. the switch is ON
  9. straight lines
  10. a complete loop
  11. 2
  12. not an IoT device
  13. 172
  14. energy used each second
  15. No
  16. output
  17. series
  18. a conductor
  19. 0.5
  20. True
  21. not safe
  22. dry your hands first
  23. 24
  24. a ceiling fan
  25. 4.5
  26. R = V ÷ I
  27. No
  28. safe
  29. closed
  30. a woollen thread
  31. leave fridge door open
  32. the longer line
  33. 5700
  34. 3
  35. closes near a magnet
  36. a cell is taken out
  37. LDR
  38. Warm
  39. stores a value
  40. 54

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