Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 503 · 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 is the strongest password for a home smart camera? (a) Tiger#Lamp42!Moon (b) 123456 (c) admin (d) password
2. 2.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🤖 Does a plain wall switch usually have a microcontroller inside? (a) No (b) Yes
4. 4.📏 Voltmeter or ammeter: which one is joined across a part? (a) voltmeter (b) ammeter
5. 5.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a copper wire across the gap. Does the bulb glow? (a) No (b) Yes
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
7. 7.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
8. 8.Which of these is true of a series circuit? (a) bulbs share the voltage (b) used in house wiring (c) one out, the rest glow (d) each gets the full volts
9. 9.✏️ In a circuit diagram, which part is drawn as many long-short pairs? (a) resistor (b) switch (c) battery (d) junction
10. 10.Which of these is safe? (a) use mains for a project (b) use small battery cells (c) climb an electric pole (d) poke things in a socket
11. 11.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 31 °C. What is shown? (a) Cool (b) Hot (c) Warm
12. 12.🔐 Is it a good or a risky habit to post your live location? (a) risky habit (b) good habit
13. 13.🧩 Which component senses how bright it is? (a) resistor (b) LDR (c) LED (d) thermistor
14. 14.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
15. 15.Which of these means the circuit is open? (a) the loop is complete (b) the switch is ON (c) a cell is taken out (d) all wires are joined
16. 16.🔌 Is aluminium foil a conductor or an insulator? (a) an insulator (b) a conductor
17. 17.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 460 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
18. 18.💡 2 identical bulbs are joined in series with an 8 V battery (ideal wires). How many volts does each bulb get? =
19. 19.True or false: to use mains for a project is not safe. (a) False (b) True
20. 20.What does a motor do? (a) makes a beeping sound (b) turns a fan or wheels (c) boosts a small signal (d) senses how hot it is
21. 21.🔺 In the V-I-R triangle, how do we find I? (a) I = V + R (b) I = V × R (c) I = V ÷ R (d) I = R ÷ V
22. 22.True or false: to poke things in a socket is not safe. (a) False (b) True
23. 23.📶 A pin that reads a push button is set as … (a) a resistor (b) an output (c) an input (d) a battery
24. 24.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) parallel (b) series
25. 25.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
26. 26.💡 Why is house wiring done in parallel? (a) each gets full voltage (b) to make bulbs dim (c) so all go off together (d) to save copper only
27. 27.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
28. 28.🔺 A 30 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
29. 29.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 2 glow? (a) No (b) Yes
30. 30.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
31. 31.🔍 Which is the odd one out? (a) a brass key (b) aluminium foil (c) a safety pin (d) a cotton thread
32. 32.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 390 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
33. 33.Which drawing is the symbol for a switch? (a) a circle with A inside (b) a straight line (c) a plain rectangle (d) a line lifted at a gap
34. 34.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
35. 35.Which of these is measured in amperes (A)? (a) power (b) voltage (c) energy used each second (d) the flow of charge
36. 36.Which of these usually has a microcontroller inside? (a) a digital alarm clock (b) a bicycle bell (c) a wind-up toy (d) a spinning top
37. 37.Which of these mainly gives out light? (a) a night lamp (b) a doorbell (c) a room heater (d) a toaster
38. 38.🔍 Which is the odd one out? (a) post your live location (b) set a strong password (c) share the Wi-Fi key (d) reuse one password
39. 39.Which of these is safe? (a) poke things in a socket (b) touch a switch when wet (c) stay away from pylons (d) use a cable with cuts
40. 40.Which of these is not an IoT device? (a) a fitness band with app (b) a wind-up clock (c) a Wi-Fi weather station (d) a Wi-Fi doorbell camera

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