Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 373 · 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.🔦 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 rubber eraser. Does the bulb glow? (a) No (b) Yes
2. 2.🔌 Is a steel spoon a conductor or an insulator? (a) a conductor (b) an insulator
3. 3.🤖 if (temperature > 32) { fan ON } else { fan OFF }
   The temperature sensor reads 31 °C. What happens? (a) fan ON (b) fan OFF
4. 4.🔺 In the V-I-R triangle, how do we find R? (a) R = V × I (b) R = V ÷ I (c) R = I ÷ V (d) R = V + I
5. 5.✏️ In a circuit diagram, which part is drawn as a line lifted at a gap? (a) switch (b) bulb (c) battery (d) cell
6. 6.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
7. 7.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
8. 8.True or false: many long-short pairs is the symbol for a resistor. (a) True (b) False
9. 9.🔁 total = 0
   for i = 1 to 4 { total = total + i }
   What is total at the end?
10. 10.True or false: to log out of shared phones is a good habit. (a) False (b) True
11. 11.🔁 count = 2
    repeat 7 times { count = count + 4 }
    What is count at the end?
12. 12.🔌 A gap of dry air between two wires acts as … (a) a switch that is ON (b) a cell (c) an insulator (d) a conductor
13. 13.🔍 Which is the odd one out? (a) a graphite rod (b) aluminium foil (c) a plastic straw (d) a steel spoon
14. 14.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True
15. 15.🧭 Which part of a microcontroller board restarts the program? (a) the reset button (b) the main chip (c) the USB port (d) the voltage regulator
16. 16.⚡ Which tiny particles drift along a metal wire to carry the current? (a) dust particles (b) photons (c) water drops (d) electrons
17. 17.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
18. 18.💡 A battery lights 4 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
19. 19.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) neither part (c) both parts (d) the if part
20. 20.🔘 Which kind of switch works only while pressed? (a) a push button (b) a slide switch (c) a tilt switch (d) a reed switch
21. 21.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) only one (b) it does not matter (c) both of them (d) none
22. 22.🤖 Microcontroller or laptop: which one runs many apps at once? (a) microcontroller (b) laptop
23. 23.True or false: on a cell, “the shorter symbol line” means the + (positive) end. (a) True (b) False
24. 24.⚡ What does an electric toy car mainly change electricity into? (a) sound (b) heat (c) movement (d) light
25. 25.🔺 A current of 40 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
26. 26.🔁 count = 9
    repeat 10 times { count = count + 4 }
    What is count at the end?
27. 27.Which drawing is the symbol for an ammeter? (a) a circle with a cross (b) one tall, one short bar (c) triangle against a bar (d) a circle with A inside
28. 28.💡 In a series circuit, how many paths does the current have? (a) none (b) two (c) one for each bulb (d) one
29. 29.📶 A pin that reads a push button is set as … (a) a battery (b) an input (c) an output (d) a resistor
30. 30.🔁 repeat 2 times { repeat 6 times { beep } }
    How many beeps are there?
31. 31.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 90 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
32. 32.🧮 Two resistors in parallel give a total that is … (a) their sum (b) less than either one (c) always zero (d) more than either one
33. 33.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
34. 34.💡 A red LED uses 2 V and should get 10 mA. It runs from a 12 V supply. What resistor (in ohms) is needed in series?
35. 35.🔁 repeat 6 times { repeat 6 times { beep } }
    How many beeps are there?
36. 36.🌈 In the resistor colour code, which number does yellow stand for?
37. 37.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 200 ms }
    How many times does the LED blink in 10 seconds?
38. 38.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.True or false: a digital thermometer usually has a microcontroller inside. (a) True (b) False

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