Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 645 · 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.🗺️ In an input → process → output plan, is “a temperature reading” the input, the process or the output? (a) output (b) input (c) process
2. 2.True or false: a plain rectangle is the symbol for an LED. (a) False (b) True
3. 3.🔁 x = 1
   repeat 4 times { x = x × 2 }
   What is x at the end?
4. 4.🧩 Which component senses how hot it is? (a) buzzer (b) resistor (c) thermistor (d) LED
5. 5.🔁 What does “count = count + 1” do? (a) takes 1 away (b) prints 1 (c) sets count to 1 (d) adds 1 to count
6. 6.🔺 A 0.8 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
7. 7.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) leave fridge door open
8. 8.🔁 Is the circuit closed or open if a wire has come loose? (a) closed (b) open
9. 9.📏 How many milliamperes (mA) is 0.83 A?
10. 10.What does a resistor do? (a) beeps for an alarm (b) senses how bright it is (c) limits the current (d) makes a beeping sound
11. 11.What does a fuse do? (a) senses how bright it is (b) is a resistance knob (c) blows if current is high (d) smooths a wobbly supply
12. 12.🔁 What does a variable do in a program? (a) blinks an LED (b) stores a value (c) measures light (d) joins two wires
13. 13.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) when either is ON (b) never (c) only when both are ON (d) only when both are OFF
14. 14.⚡ A solar panel changes which kind of energy into electricity? (a) wind energy (b) chemical energy (c) sound energy (d) light energy
15. 15.⚠️ About how many volts do home sockets in India supply? (a) 1.5 V (b) 9 V (c) 230 V (d) 12 V
16. 16.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a soil moisture sensor (c) a temperature sensor (d) a motion sensor
17. 17.🔘 When a switch is ON, the circuit is … (a) open (b) closed (c) cut (d) broken
18. 18.📏 How many milliamperes (mA) is 2.95 A?
19. 19.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) False (b) True
20. 20.True or false: two or more cell symbols is the symbol for a battery. (a) False (b) True
21. 21.True or false: a tilt switch closes when tipped over. (a) False (b) True
22. 22.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
23. 23.🔋 Does a cell give electricity or use electricity? (a) uses electricity (b) gives electricity
24. 24.🤖 if (moisture < 30) { pump ON } else { pump OFF }
    The soil moisture sensor reads 26 %. What happens? (a) pump OFF (b) pump ON
25. 25.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) neither part (c) both parts (d) the if part
26. 26.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a rubber band. Does the bulb glow? (a) No (b) Yes
27. 27.🤖 Does a TV remote usually have a microcontroller inside? (a) No (b) Yes
28. 28.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) less than either one (c) always zero (d) their sum
29. 29.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
30. 30.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a soil moisture sensor (c) a rain sensor (d) a light sensor
31. 31.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
32. 32.True or false: aluminium foil is an insulator. (a) True (b) False
33. 33.🧩 A capacitor in a circuit can … (a) store charge briefly (b) make light (c) spin a wheel (d) measure heat
34. 34.🔺 In the V-I-R triangle, how do we find V? (a) V = I × R (b) V = I + R (c) V = I ÷ R (d) V = R ÷ I
35. 35.📏 In the water-pipe picture of a circuit, resistance is like … (a) the flow of water (b) a narrow pipe (c) a bigger tank (d) the water pressure
36. 36.True or false: the voltmeter measures voltage. (a) False (b) True
37. 37.🔐 Is it a good or a risky habit to share camera links? (a) risky habit (b) good habit
38. 38.🔋 What should you do with used-up cells? (a) bury them in soil (b) give them for recycling (c) throw them in a fire (d) cut them open
39. 39.⏱️ How many milliseconds is a wait of 0.9 seconds?
40. 40.📶 Digital or analog: how bright a room is? (a) analog (b) digital

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