Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 391 · 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.True or false: a ceramic cup is a conductor. (a) True (b) False
2. 2.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
3. 3.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) symbols are heavier (c) to make it colourful (d) to hide the circuit
4. 4.🧮 A 1 V battery is joined to 2 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
5. 5.💡 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 1 glow? (a) Yes (b) No
6. 6.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a motor (c) a pump (d) a servo motor
7. 7.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) gets smaller (c) gets bigger (d) becomes zero
8. 8.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) − (negative) (b) + (positive)
9. 9.🔋 Does a computer give electricity or use electricity? (a) gives electricity (b) uses electricity
10. 10.🌐 Is a wind-up clock an IoT device? (a) not an IoT device (b) an IoT device
11. 11.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
12. 12.🤖 Does a digital alarm clock usually have a microcontroller inside? (a) Yes (b) No
13. 13.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 200 ms }
    How many times does the LED blink in 4 seconds?
14. 14.🔌 Is an iron nail a conductor or an insulator? (a) an insulator (b) a conductor
15. 15.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
16. 16.True or false: on an LED, the leg by the flat edge is the anode (+). (a) False (b) True
17. 17.📏 How many ohms make 1 kilo-ohm (kΩ)? (a) 100 (b) 10 (c) 1000 (d) 1024
18. 18.🔺 A current of 0.1 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
19. 19.🔍 Which is the odd one out? (a) a button press (b) the pump turns on (c) a buzzer beeps (d) the fan starts
20. 20.🧮 Resistors of 100 Ω, 220 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
21. 21.Which drawing is the symbol for a junction? (a) one tall, one short bar (b) triangle against a bar (c) a circle with a cross (d) a dot where wires meet
22. 22.Which drawing is the symbol for an LED? (a) a circle with M inside (b) a long and a short line (c) a dot where wires meet (d) triangle, bar and arrows
23. 23.💡 3 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 3 glow? (a) No (b) Yes
24. 24.⚠️ About how many volts do home sockets in India supply? (a) 230 V (b) 1.5 V (c) 9 V (d) 12 V
25. 25.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
26. 26.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
27. 27.🔁 repeat 2 times { repeat 5 times { beep } }
    How many beeps are there?
28. 28.🔺 A 0.2 V supply is joined across a 2 Ω resistor. What current flows (in amperes)? =
29. 29.⚡ Power tells us … (a) energy used each second (b) the colour of light (c) the size of a cell (d) the length of a wire
30. 30.True or false: “a buzzer beeps” is the output. (a) True (b) False
31. 31.📏 Voltmeter or ammeter: which one is joined across a part? (a) voltmeter (b) ammeter
32. 32.🤖 What is a microcontroller? (a) a type of battery (b) a computer on one chip (c) a big desktop computer (d) a kind of bulb
33. 33.Which of these uses electricity? (a) a wind turbine (b) a cell (c) a solar panel (d) a television
34. 34.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 26 °C. What happens? (a) fan ON (b) fan OFF
35. 35.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 90000 Ω resistor? (a) white-black-red (b) white-black-orange (c) brown-white-orange (d) white-black-yellow
36. 36.⚡ A fan changes electrical energy mainly into which kind of energy? (a) sound energy (b) movement energy (c) light energy (d) chemical energy
37. 37.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use daylight to read (d) leave the TV on standby
38. 38.🔌 A gap of dry air between two wires acts as … (a) a cell (b) a switch that is ON (c) an insulator (d) a conductor
39. 39.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
40. 40.🔢 To plan an electronics project, which comes first: “build it with an adult” or “pick a problem to solve”? (a) pick a problem to solve (b) build it with an adult

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