Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 113 · 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.Which of these is measured in volts (V)? (a) current (b) resistance (c) energy used each second (d) the push of a cell
2. 2.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
3. 3.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a sensor (d) a battery
4. 4.True or false: to use a cable with cuts is not safe. (a) True (b) False
5. 5.🔺 A current of 0.1 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
6. 6.True or false: a water heater mainly gives out light. (a) False (b) True
7. 7.True or false: “own switch for each bulb” is true of a parallel circuit. (a) False (b) True
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
9. 9.🔋 A 12 V battery and three 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
10. 10.🧮 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
11. 11.⚡ Which tiny particles drift along a metal wire to carry the current? (a) dust particles (b) electrons (c) photons (d) water drops
12. 12.🌈 Which band is read first on a resistor? (a) the gold band (b) the widest gap (c) any band (d) the one nearest an end
13. 13.📏 How many watts (W) is 0.2 kW?
14. 14.✏️ In a circuit diagram, which part is drawn as triangle, bar and arrows? (a) LED (b) junction (c) capacitor (d) ammeter
15. 15.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
16. 16.🔋 6 identical 2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
17. 17.🔁 count = 4
    repeat 4 times { count = count + 2 }
    What is count at the end?
18. 18.⚡ What does a school bell mainly change electricity into? (a) heat (b) movement (c) light (d) sound
19. 19.🧮 Resistors of 10 Ω, 20 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
20. 20.🔌 Is a cotton thread a conductor or an insulator? (a) an insulator (b) a conductor
21. 21.Which of these is a good habit? (a) tap unknown app links (b) post your live location (c) ignore update messages (d) change default passwords
22. 22.True or false: a cotton thread is an insulator. (a) True (b) False
23. 23.Which of these is true of a series circuit? (a) one out, the rest glow (b) each gets the full volts (c) used in house wiring (d) a break stops every bulb
24. 24.🧩 Which component has coloured bands? (a) buzzer (b) motor (c) resistor (d) LDR
25. 25.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 31 °C. What is shown? (a) Hot (b) Cool (c) Warm
26. 26.What does a push button do? (a) works only while pressed (b) closes near a magnet (c) slides side to side (d) stays where you flip it
27. 27.🔍 Which is the odd one out? (a) an electric iron (b) a rice cooker (c) a ceiling fan (d) a toaster
28. 28.🔁 count = 2
    while (count < 11) { count = count + 3 }
    How many times does the loop run?
29. 29.🔘 Which kind of switch slides side to side? (a) a slide switch (b) a reed switch (c) a push button (d) a toggle switch
30. 30.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 700 ms }
    How many times does the LED blink in 8 seconds?
31. 31.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 71 Ω resistor? (a) grey-brown-black (b) brown-violet-black (c) violet-brown-black (d) violet-brown-brown
32. 32.🔍 Which is the odd one out? (a) dry your hands first (b) fly a kite near wires (c) throw cells in a fire (d) use a cable with cuts
33. 33.⏱️ loop forever { LED ON; wait 750 ms; LED OFF; wait 750 ms }
    How many milliseconds does one blink (ON + OFF) take?
34. 34.📏 Which unit measures the push of a cell? (a) ohm (Ω) (b) ampere (A) (c) watt (W) (d) volt (V)
35. 35.True or false: current is measured in volts (V). (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
37. 37.Which drawing is the symbol for a wire? (a) triangle against a bar (b) a small empty box (c) a circle with a cross (d) a straight line
38. 38.🔐 Who should decide which smart devices go in a child’s room? (a) an online stranger (b) the app’s adverts (c) nobody at all (d) a parent or guardian
39. 39.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I + R (c) V = I × R (d) V = I ÷ R
40. 40.🔁 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

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