Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 202 · 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 means the circuit is open? (a) all wires are joined (b) a wire has come loose (c) the loop is complete (d) the switch is ON
2. 2.🔁 repeat 4 times { repeat 3 times { beep } }
   How many beeps are there?
3. 3.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
4. 4.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
5. 5.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 50 % (c) 0 % (d) 5 %
6. 6.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
8. 8.Which drawing is the symbol for a bulb? (a) a plain rectangle (b) a circle with a cross (c) many long-short pairs (d) a straight line
9. 9.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they keep glowing (b) they explode (c) they all go out (d) they get dimmer
10. 10.Which of these is a conductor? (a) a woollen thread (b) aluminium foil (c) a glass marble (d) a rubber eraser
11. 11.True or false: a microcontroller needs much more power. (a) True (b) False
12. 12.What does the Wi-Fi link do? (a) carries the data (b) measures the real world (c) acts on a command (d) reads values, decides
13. 13.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
14. 14.Which job is done by the reset button? (a) brings power and code (b) keeps the voltage steady (c) restarts the program (d) runs the program
15. 15.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
17. 17.🔋 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)? =
18. 18.True or false: a rice cooker mainly makes sound. (a) False (b) True
19. 19.Which job needs a buzzer? (a) spin a robot’s wheels (b) open a gate to 90° (c) show the temperature (d) beep an alarm
20. 20.🧮 A 3 V battery is joined to 2 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
21. 21.🌐 A soil sensor sends a reading to an app every 10 minutes. How many readings arrive in 1 hour?
22. 22.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 27 °C. What happens? (a) fan ON (b) fan OFF
23. 23.🔁 What do we call a circuit with a break in it? (a) a closed circuit (b) a series circuit (c) a full circuit (d) an open circuit
24. 24.True or false: an electric iron mainly gives out heat. (a) True (b) False
25. 25.🔋 How many volts does one ordinary torch cell give? (a) 1.5 V (b) 230 V (c) 15 V (d) 0.5 V
26. 26.What does a push button do? (a) works only while pressed (b) closes near a magnet (c) flips up or down (d) closes when tipped over
27. 27.Which of these uses electricity? (a) a water pump (b) a battery (c) a bicycle dynamo (d) a cell
28. 28.Which of these is measured in ohms (Ω)? (a) the push of a cell (b) power (c) current (d) resistance
29. 29.🧩 Which component makes things spin? (a) motor (b) thermistor (c) LED (d) resistor
30. 30.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
31. 31.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
32. 32.🔁 repeat 2 times { repeat 5 times { beep } }
    How many beeps are there?
33. 33.🔍 Which is the odd one out? (a) poke things in a socket (b) use mains for a project (c) dry your hands first (d) use a cable with cuts
34. 34.🌈 A resistor has the colour bands orange, brown, red. What is its value (in ohms)?
35. 35.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
36. 36.🤖 “if (A AND B)” is true when … (a) only B is true (b) both A and B are true (c) both are false (d) only A is true
37. 37.📏 Voltmeter or ammeter: which one is joined in series? (a) voltmeter (b) ammeter
38. 38.⚠️ Is it safe to use small battery cells? (a) safe (b) not safe
39. 39.💡 An LED is joined to a 9 V battery through a 330 Ω resistor; the leg next to the flat edge of its rim goes to the + side. What happens? (a) may burn out (b) lights up (c) does not light
40. 40.⚡ Power tells us … (a) energy used each second (b) the size of a cell (c) the colour of light (d) the length of a wire

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