Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 601 · 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 saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
2. 2.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) neither line (c) the shorter line (d) the longer line
3. 3.True or false: a transistor glows using little power. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a ceiling fan (b) an electric drill (c) an electric kettle (d) a table fan
5. 5.🔺 A current of 40 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
6. 6.🧩 Which component lets current go one way? (a) diode (b) potentiometer (c) capacitor (d) thermistor
7. 7.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
8. 8.What does a push button do? (a) works only while pressed (b) slides side to side (c) closes when tipped over (d) stays where you flip it
9. 9.True or false: “one out, the rest glow” is true of a series circuit. (a) False (b) True
10. 10.📶 Digital or analog: many values in a range? (a) digital (b) analog
11. 11.Which of these is measured in ohms (Ω)? (a) how much a part resists (b) the push of a cell (c) the flow of charge (d) power
12. 12.Which of these is safe? (a) use a cable with cuts (b) use mains for a project (c) throw cells in a fire (d) fly kites in open fields
13. 13.🔋 What is a battery? (a) a kind of bulb (b) two or more cells joined (c) a switch with a lid (d) one single wire
14. 14.🔘 What does a switch do in a circuit? (a) stores current (b) makes electricity (c) changes the voltage (d) opens or closes the loop
15. 15.🔋 2 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
16. 16.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
17. 17.🔁 x = 5
    repeat 5 times { x = x × 2 }
    What is x at the end?
18. 18.🔺 A 20 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
19. 19.🌈 A resistor has the colour bands brown, red, orange. What is its value in kilo-ohms (kΩ)? =
20. 20.🔺 A current of 25 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
21. 21.🧮 Two resistors in parallel give a total that is … (a) their sum (b) more than either one (c) less than either one (d) always zero
22. 22.Which drawing is the symbol for a battery? (a) a long and a short line (b) a circle with M inside (c) two or more cell symbols (d) a circle with a cross
23. 23.⚠️ Is it safe to poke things in a socket? (a) safe (b) not safe
24. 24.Which of these mainly gives out heat? (a) a toaster (b) a tube light (c) a table fan (d) an LED lamp
25. 25.🔘 Which kind of switch works only while pressed? (a) a tilt switch (b) a reed switch (c) a push button (d) a toggle switch
26. 26.🔋 How many 1.5 V cells must be joined in series to give 7.5 V?
27. 27.⚡ Power tells us … (a) the length of a wire (b) the size of a cell (c) energy used each second (d) the colour of light
28. 28.Which of these is a good habit? (a) reuse one password (b) post your live location (c) change default passwords (d) share camera links
29. 29.🌈 Which band is read first on a resistor? (a) the one nearest an end (b) the gold band (c) the widest gap (d) any band
30. 30.🔘 Which kind of switch springs back when let go? (a) a toggle switch (b) a tilt switch (c) a push button (d) a reed switch
31. 31.🔁 repeat 2 times { repeat 3 times { beep } }
    How many beeps are there?
32. 32.True or false: two or more cell symbols is the symbol for a battery. (a) True (b) False
33. 33.🌈 A resistor has the colour bands orange, violet, black. What is its value (in ohms)?
34. 34.🔋 How many volts does one ordinary torch cell give? (a) 230 V (b) 15 V (c) 0.5 V (d) 1.5 V
35. 35.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 23 °C. What happens? (a) fan OFF (b) fan ON
36. 36.🔌 Is a graphite rod a conductor or an insulator? (a) an insulator (b) a conductor
37. 37.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a glass marble across the gap. Does the bulb glow? (a) Yes (b) No
38. 38.Which of these is safe? (a) poke things in a socket (b) keep drinks far away (c) use mains for a project (d) touch a fallen wire
39. 39.Which of these mainly makes movement? (a) an electric kettle (b) an exhaust fan (c) a water heater (d) a torch
40. 40.✏️ In a circuit diagram, which part is drawn as a long and a short line? (a) diode (b) cell (c) LED (d) motor

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