Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 432 · 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 is the output? (a) the pump turns on (b) count button presses (c) a motion sensor signal (d) decide if soil is dry
2. 2.🔁 count = 4
   repeat 9 times { count = count + 8 }
   What is count at the end?
3. 3.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V + I (d) P = V × I
4. 4.🔐 A smart-camera app asks for your school name and home address. What should you do? (a) ask a parent first (b) post it online (c) type it all in (d) share it with friends
5. 5.🗺️ In an input → process → output plan, is “a temperature reading” the input, the process or the output? (a) output (b) input (c) process
6. 6.True or false: on an LED, the leg by the flat edge is the cathode (−). (a) False (b) True
7. 7.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
   The temperature is 34 °C. What is shown? (a) Cool (b) Warm (c) Hot
9. 9.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they get dimmer (c) they keep glowing (d) they explode
10. 10.📏 Voltmeter or ammeter: which one measures voltage? (a) ammeter (b) voltmeter
11. 11.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
12. 12.🔺 A current of 0.1 A flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
13. 13.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) capacitor (b) motor (c) diode (d) LED
14. 14.💡 What does LED stand for? (a) large electric dial (b) low energy device (c) light-emitting diode (d) light energy dial
15. 15.True or false: the push of a cell is measured in watts (W). (a) False (b) True
16. 16.🔋 5 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)? =
17. 17.🔍 Which is the odd one out? (a) cover unused cameras (b) set up with a parent (c) accept every permission (d) change default passwords
18. 18.🔺 A 5 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
19. 19.Which of these is not safe? (a) fly kites in open fields (b) dry your hands first (c) stop if a part gets hot (d) use a cable with cuts
20. 20.💡 4 identical bulbs are in parallel and each one takes 0.1 A. What total current (in amperes) comes from the battery? =
21. 21.What does the cloud server do? (a) shows data to you (b) stores data online (c) reads values, decides (d) carries the data
22. 22.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
23. 23.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) wavy lines (c) straight lines (d) little stars
24. 24.⏱️ How many milliseconds is a wait of 3.6 seconds?
25. 25.🔘 When a switch is ON, the circuit is … (a) closed (b) cut (c) broken (d) open
26. 26.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a paper strip across the gap. Does the bulb glow? (a) Yes (b) No
27. 27.Which of these means the circuit is closed? (a) a cell is taken out (b) a wire is cut (c) a wire has come loose (d) all wires are joined
28. 28.🔘 What does a switch do in a circuit? (a) opens or closes the loop (b) changes the voltage (c) stores current (d) makes electricity
29. 29.🔋 Cells joined + to − in a row (series) give … (a) the same voltage (b) no voltage (c) a bigger voltage (d) a smaller voltage
30. 30.🔌 Is aluminium foil a conductor or an insulator? (a) an insulator (b) a conductor
31. 31.🔍 Which is the odd one out? (a) a motion sensor (b) a water pump (c) a keypad (d) a light sensor
32. 32.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) energy used each second (d) the size of a cell
33. 33.🧮 Two resistors in parallel give a total that is … (a) always zero (b) their sum (c) more than either one (d) less than either one
34. 34.📏 In the water-pipe picture of a circuit, current is like … (a) the pipe colour (b) the water pressure (c) the flow of water (d) a narrow pipe
35. 35.🔺 A current of 20 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
36. 36.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are ON (b) never (c) only when both are OFF (d) when either is ON
37. 37.🌐 In an IoT system, which part shows data to you? (a) phone app (b) microcontroller (c) Wi-Fi (d) cloud server
38. 38.🔺 In the V-I-R triangle, how do we find I? (a) I = V + R (b) I = R ÷ V (c) I = V × R (d) I = V ÷ R
39. 39.🔍 Which is the odd one out? (a) aluminium foil (b) a plastic ruler (c) a wooden stick (d) a cotton thread
40. 40.Which of these mainly makes movement? (a) a siren (b) a tube light (c) a torch (d) an electric drill

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