Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 660 · 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 part of a microcontroller board restarts the program? (a) the reset button (b) the USB port (c) the voltage regulator (d) the power LED
2. 2.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
3. 3.Which of these is safe? (a) climb an electric pole (b) touch a fallen wire (c) open a phone charger (d) use small battery cells
4. 4.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
5. 5.🤖 if (temperature > 25) { fan ON } else { fan OFF }
   The temperature sensor reads 31 °C. What happens? (a) fan OFF (b) fan ON
6. 6.True or false: aluminium foil is a conductor. (a) True (b) False
7. 7.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
8. 8.What does a buzzer do? (a) glows using little power (b) has coloured bands (c) makes a beeping sound (d) blows if current is high
9. 9.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) a single current path (c) own switch for each bulb (d) a break stops every bulb
10. 10.🔋 6 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)? =
11. 11.🔍 Which is the odd one out? (a) a motion sensor (b) a sound sensor (c) a water pump (d) a keypad
12. 12.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
13. 13.True or false: a line lifted at a gap is the symbol for a switch. (a) False (b) True
14. 14.Which of these gives us electricity? (a) a solar panel (b) a washing machine (c) a computer (d) a television
15. 15.🔺 A 5 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
16. 16.True or false: “a knob turned part way” is an analog signal. (a) True (b) False
17. 17.True or false: to use mains for a project is safe. (a) False (b) True
18. 18.What does a toggle switch do? (a) works only while pressed (b) closes when tipped over (c) stays where you flip it (d) springs back when let go
19. 19.True or false: on an LED, the shorter leg is the anode (+). (a) False (b) True
20. 20.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
21. 21.What does an LDR do? (a) stores a little charge (b) senses how bright it is (c) senses how hot it is (d) boosts a small signal
22. 22.True or false: if the loop is complete, the circuit is closed and current flows. (a) True (b) False
23. 23.📏 Which unit measures the push of a cell? (a) ampere (A) (b) ohm (Ω) (c) volt (V) (d) watt (W)
24. 24.⚡ What does an exhaust fan mainly change electricity into? (a) sound (b) light (c) movement (d) heat
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
26. 26.🌐 A weather station sends one reading every 10 seconds. How many readings does it send in 4 minutes?
27. 27.🔐 Is it a good or a risky habit to share camera links? (a) good habit (b) risky habit
28. 28.True or false: “one out, the rest glow” is true of a series circuit. (a) True (b) False
29. 29.🔺 A 1 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
30. 30.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) light energy (b) sound energy (c) chemical energy (d) movement energy
31. 31.🧾 A family uses 100 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🌈 A resistor has the colour bands grey, yellow, orange. What is its value in kilo-ohms (kΩ)? =
33. 33.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
34. 34.True or false: “many paths for current” is true of a series circuit. (a) True (b) False
35. 35.📏 How many kilowatts (kW) is 950 W? =
36. 36.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
37. 37.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) diode (b) ammeter (c) motor (d) bulb
38. 38.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) No (b) Yes
39. 39.True or false: “the fan starts” is the output. (a) True (b) False
40. 40.Which of these has no microcontroller inside? (a) a microwave oven (b) a toy robot (c) a wind-up toy (d) a digital thermometer

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