Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 501 · 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.📏 How many ohms (Ω) is 6.7 kΩ?
2. 2.🔺 A current of 3 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
3. 3.Which of these is true of a series circuit? (a) own switch for each bulb (b) used in house wiring (c) a single current path (d) many paths for current
4. 4.🧮 Resistors of 20 Ω, 470 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
5. 5.🔍 Which is the odd one out? (a) climb an electric pole (b) use mains for a project (c) take cells out after use (d) open a phone charger
6. 6.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) junction (b) ammeter (c) motor (d) voltmeter
7. 7.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by aluminium foil. Does the bulb glow? (a) Yes (b) No
8. 8.True or false: a toggle switch works only while pressed. (a) True (b) False
9. 9.🔺 A current of 20 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
10. 10.Which drawing is the symbol for a capacitor? (a) a circle with a cross (b) a dot where wires meet (c) two equal parallel lines (d) a line lifted at a gap
11. 11.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.⚠️ About how many volts do home sockets in India supply? (a) 1.5 V (b) 12 V (c) 9 V (d) 230 V
13. 13.✏️ In a circuit diagram, wires are usually drawn as … (a) little stars (b) wavy lines (c) straight lines (d) dotted circles
14. 14.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they get dimmer (c) they keep glowing (d) they all go out
16. 16.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the filament (b) the base (c) the switch (d) the glass
17. 17.🌈 A resistor has the colour bands violet, grey, black. What is its value (in ohms)?
18. 18.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
19. 19.Which of these uses electricity? (a) a computer (b) a cell (c) a solar panel (d) a wind turbine
20. 20.⏱️ repeat 2 times { buzzer ON; wait 1000 ms; buzzer OFF; wait 800 ms }
    How many milliseconds does this take in all?
21. 21.True or false: “one bulb out, all go out” is true of a series circuit. (a) True (b) False
22. 22.⚡ A solar panel changes which kind of energy into electricity? (a) light energy (b) chemical energy (c) sound energy (d) wind energy
23. 23.🔋 Does a generator give electricity or use electricity? (a) uses electricity (b) gives electricity
24. 24.🧮 Resistors of 150 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
25. 25.Which drawing is the symbol for a wire? (a) a circle with an X in it (b) two or more cell symbols (c) a straight line (d) a dot where wires meet
26. 26.Which of these is not safe? (a) build with an adult near (b) keep drinks far away (c) climb an electric pole (d) dry your hands first
27. 27.🔺 A current of 0.25 A flows when 1 V is joined across a resistor. What is its resistance (in ohms)?
28. 28.🔺 A 5 V supply is joined across a 250 Ω resistor. What current flows (in milliamperes, mA)?
29. 29.🔢 To run one loop of a plant-watering program, which comes first: “read the soil sensor” or “compare with the limit”? (a) read the soil sensor (b) compare with the limit
30. 30.🧮 Three equal 150 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
31. 31.🌈 A resistor has the colour bands yellow, white, orange. What is its value in kilo-ohms (kΩ)? =
32. 32.🧮 Two resistors in parallel give a total that is … (a) always zero (b) their sum (c) less than either one (d) more than either one
33. 33.True or false: energy used each second is measured in watts (W). (a) False (b) True
34. 34.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) becomes zero (c) gets bigger (d) gets smaller
35. 35.🗺️ Before building a project, what should you write down first? (a) nothing at all (b) the box colour (c) the final price (d) inputs and outputs
36. 36.🤖 Microcontroller or laptop: which one needs much more power? (a) laptop (b) microcontroller
37. 37.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
38. 38.Which of these gives us electricity? (a) a mobile phone (b) a television (c) a washing machine (d) a generator
39. 39.🧩 Which part changes electrical energy into movement? (a) a fuse (b) a motor (c) a resistor (d) an LED
40. 40.🔺 A current of 25 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =

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