Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 526 · 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.🔘 Two switches are in series. When does the bulb glow? (a) when both are ON (b) when either is ON (c) when both are OFF (d) never
2. 2.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
3. 3.🔋 What is a battery? (a) a switch with a lid (b) a kind of bulb (c) two or more cells joined (d) one single wire
4. 4.⚡ Power tells us … (a) the length of a wire (b) the colour of light (c) the size of a cell (d) energy used each second
5. 5.🌈 In the resistor colour code, which number does red stand for?
6. 6.💡 2 identical bulbs are in parallel and each one takes 0.2 A. What total current (in amperes) comes from the battery? =
7. 7.⚠️ About how many volts do home sockets in India supply? (a) 12 V (b) 230 V (c) 1.5 V (d) 9 V
8. 8.🧩 Which part changes electrical energy into movement? (a) a motor (b) a fuse (c) a resistor (d) an LED
9. 9.🤖 “if (A AND B)” is true when … (a) only A is true (b) both are false (c) only B is true (d) both A and B are true
10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
11. 11.What does the phone app do? (a) carries the data (b) stores data online (c) reads values, decides (d) shows data to you
12. 12.🔢 To get a sensor reading onto a phone, what comes right after “the board reads it”? (a) the app shows it (b) the cloud stores it (c) the sensor measures (d) it is sent by Wi-Fi
13. 13.True or false: to use small battery cells is safe. (a) False (b) True
14. 14.⏱️ How many milliseconds is a wait of 0.6 seconds?
15. 15.Which of these gives us electricity? (a) a bicycle dynamo (b) a mobile phone (c) a television (d) a computer
16. 16.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 23 cm. What happens? (a) buzzer is silent (b) buzzer beeps
17. 17.🏠 Which is a smart-home example? (a) lights on from an app (b) a printed map (c) a hand fan (d) a candle in a jar
18. 18.Which of these is true of a series circuit? (a) many paths for current (b) each gets the full volts (c) a break stops every bulb (d) one out, the rest glow
19. 19.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a graphite rod across the gap. Does the bulb glow? (a) Yes (b) No
20. 20.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is ON, B is OFF and C is ON. Does the bulb glow? (a) Yes (b) No
21. 21.🔍 Which is the odd one out? (a) a steel spoon (b) a copper wire (c) an iron nail (d) a wooden stick
22. 22.✏️ In a circuit diagram, which part is drawn as a circle with a cross? (a) resistor (b) bulb (c) LED (d) wire
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
24. 24.🔺 A current of 40 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
25. 25.🔌 Which part of a screwdriver should an electrician hold? (a) the metal tip (b) the bare end (c) the plastic handle (d) the steel shaft
26. 26.Which of these has no microcontroller inside? (a) a washing machine (b) a microwave oven (c) a spinning top (d) a digital alarm clock
27. 27.🔁 count = 10
    repeat 7 times { count = count + 10 }
    What is count at the end?
28. 28.📏 How many kilowatts (kW) is 3650 W? =
29. 29.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) True (b) False
30. 30.What does a slide switch do? (a) closes near a magnet (b) slides side to side (c) works only while pressed (d) springs back when let go
31. 31.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 470 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
32. 32.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) double the voltage (c) half the voltage (d) no voltage
33. 33.⏱️ repeat 5 times { buzzer ON; wait 900 ms; buzzer OFF; wait 200 ms }
    How many milliseconds does this take in all?
34. 34.🔁 count = 9
    repeat 8 times { count = count + 3 }
    What is count at the end?
35. 35.🔺 A current of 20 mA flows when 8 V is joined across a resistor. What is its resistance (in ohms)?
36. 36.Which job needs a motor? (a) turn to an exact angle (b) open a gate to 90° (c) move water to plants (d) spin a robot’s wheels
37. 37.🌈 Which band is read first on a resistor? (a) any band (b) the widest gap (c) the gold band (d) the one nearest an end
38. 38.🤖 if (light < 300) { lamp ON } else { lamp OFF }
    The light sensor reads 229. What happens? (a) lamp ON (b) lamp OFF
39. 39.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the glass (b) the base (c) the filament (d) the switch
40. 40.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) False (b) True

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids