Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 567 · 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.🔁 What does “count = count + 1” do? (a) adds 1 to count (b) sets count to 1 (c) prints 1 (d) takes 1 away
2. 2.💡 An LED is joined to a 6 V battery through a 220 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
3. 3.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
4. 4.⚡ What does an electric toy car mainly change electricity into? (a) sound (b) light (c) movement (d) heat
5. 5.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the battery (b) the process (c) the input (d) the output
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a servo motor (c) a buzzer (d) a motor
7. 7.🔺 A 6 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
8. 8.🧮 Two resistors in parallel give a total that is … (a) always zero (b) less than either one (c) their sum (d) more than either one
9. 9.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) a break stops every bulb (c) own switch for each bulb (d) one bulb out, all go out
10. 10.🌐 Is a plain wall switch an IoT device? (a) not an IoT device (b) an IoT device
11. 11.🤖 if (sound > 80) { red LED ON } else { green LED ON }
    The sound sensor reads 61. What happens? (a) red LED ON (b) green LED ON
12. 12.🔋 How many 1.5 V cells must be joined in series to give 7.5 V?
13. 13.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
14. 14.⏱️ A program says “wait 5250 ms”. How many seconds is that? =
15. 15.🔋 Cells joined + to − in a row (series) give … (a) the same voltage (b) a smaller voltage (c) no voltage (d) a bigger voltage
16. 16.True or false: a dot where wires meet is the symbol for a capacitor. (a) False (b) True
17. 17.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
18. 18.🔋 7 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)? =
19. 19.Which of these is a conductor? (a) a plastic ruler (b) a steel spoon (c) a cotton thread (d) a glass marble
20. 20.🧮 A 20 Ω resistor is joined in series with two equal 330 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
21. 21.Which job is done by the pins? (a) shows the board is on (b) connect sensors and LEDs (c) brings power and code (d) runs the program
22. 22.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these is measured in volts (V)? (a) voltage (b) how much a part resists (c) current (d) the flow of charge
24. 24.Which of these mainly gives out light? (a) a room heater (b) a rice cooker (c) a tube light (d) an exhaust fan
25. 25.🔋 How many volts does one ordinary torch cell give? (a) 230 V (b) 15 V (c) 1.5 V (d) 0.5 V
26. 26.Which of these is measured in ohms (Ω)? (a) power (b) voltage (c) the flow of charge (d) how much a part resists
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
28. 28.What does a fuse do? (a) blows if current is high (b) smooths a wobbly supply (c) beeps for an alarm (d) has coloured bands
29. 29.🔁 repeat 6 times { repeat 6 times { beep } }
    How many beeps are there?
30. 30.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
32. 32.🔍 Which is the odd one out? (a) a plain table fan (b) a Wi-Fi smart plug (c) a fitness band with app (d) an app-controlled bulb
33. 33.⏱️ loop forever { LED ON; wait 450 ms; LED OFF; wait 550 ms }
    How many times does the LED blink in 2 seconds?
34. 34.🌈 A resistor has the colour bands blue, black, orange. What is its value (in ohms)?
35. 35.True or false: to switch on with a clap, use a distance sensor. (a) True (b) False
36. 36.True or false: a metal paper clip is an insulator. (a) False (b) True
37. 37.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) cell (b) battery (c) junction (d) resistor
38. 38.💡 A red LED uses 2 V and should get 10 mA. It runs from a 6 V supply. What resistor (in ohms) is needed in series?
39. 39.🔍 Which is the odd one out? (a) a metal paper clip (b) a graphite rod (c) a woollen thread (d) an iron nail
40. 40.🔺 A current of 0.5 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =

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