Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 684 · 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.🔐 Privacy for a smart device means controlling … (a) how loud it beeps (b) its colour (c) who can see your data (d) its battery size
2. 2.Which of these is not an IoT device? (a) a battery torch (b) an app-controlled bulb (c) a Wi-Fi doorbell camera (d) a fitness band with app
3. 3.💡 2 identical bulbs are joined in parallel across a 3 V battery (ideal wires). How many volts does each bulb get? =
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
5. 5.🔘 A cell, a bulb and switches A, B and C are joined one after another in a single loop (series). A is ON, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
6. 6.⚡ Power tells us … (a) the length of a wire (b) the size of a cell (c) the colour of light (d) energy used each second
7. 7.True or false: to use small battery cells is safe. (a) False (b) True
8. 8.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
9. 9.🔘 Which kind of switch works only while pressed? (a) a reed switch (b) a slide switch (c) a toggle switch (d) a push button
10. 10.🔍 Which is the odd one out? (a) a turning knob (b) a sound sensor (c) a speaker (d) a push button
11. 11.True or false: to use a cable with cuts is safe. (a) False (b) True
12. 12.Which job needs a pump? (a) show the temperature (b) beep an alarm (c) move water to plants (d) open a gate to 90°
13. 13.💡 A battery lights 4 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
14. 14.🔋 4 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)? =
15. 15.🔘 Which kind of switch flips up or down? (a) a reed switch (b) a toggle switch (c) a push button (d) a tilt switch
16. 16.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 1000 (c) 10 (d) 60
17. 17.🔁 total = 0
    for i = 1 to 11 { total = total + i }
    What is total at the end?
18. 18.🔋 How many volts does one ordinary torch cell give? (a) 230 V (b) 0.5 V (c) 1.5 V (d) 15 V
19. 19.🧮 A 20 Ω resistor is joined in series with two equal 1000 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
20. 20.What does a diode do? (a) limits the current (b) stores a little charge (c) makes things spin (d) lets current go one way
21. 21.🧩 Which part changes electrical energy into movement? (a) a fuse (b) an LED (c) a resistor (d) a motor
22. 22.📏 How many kilowatts (kW) is 4500 W? =
23. 23.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
24. 24.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
25. 25.🔺 A 2 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
26. 26.🔐 Is it a good or a risky habit to share the Wi-Fi key? (a) risky habit (b) good habit
27. 27.True or false: a toy robot has no microcontroller inside. (a) False (b) True
28. 28.🔌 A gap of dry air between two wires acts as … (a) an insulator (b) a cell (c) a switch that is ON (d) a conductor
29. 29.🔢 To plan an electronics project, which comes first: “test it and fix it” or “draw the circuit diagram”? (a) draw the circuit diagram (b) test it and fix it
30. 30.🔁 x = 3
    repeat 3 times { x = x × 2 }
    What is x at the end?
31. 31.True or false: a torch mainly gives out light. (a) True (b) False
32. 32.⏱️ How many milliseconds is a wait of 1.6 seconds?
33. 33.🌈 Which band is read first on a resistor? (a) the gold band (b) the widest gap (c) the one nearest an end (d) any band
34. 34.Which of these is an insulator? (a) a graphite rod (b) a woollen thread (c) a copper wire (d) aluminium foil
35. 35.⚠️ Why must we never touch switches with wet hands? (a) it spoils the paint (b) it is just untidy (c) water carries current (d) water makes it cold
36. 36.True or false: to build with an adult near is safe. (a) True (b) False
37. 37.Which of these is an IoT device? (a) a pencil sharpener (b) a battery torch (c) a paper calendar (d) an app-controlled bulb
38. 38.Which drawing is the symbol for a motor? (a) triangle against a bar (b) a circle with M inside (c) triangle, bar and arrows (d) many long-short pairs
39. 39.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
40. 40.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed

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