Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 911 · 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.⚡ Power tells us … (a) the size of a cell (b) the length of a wire (c) energy used each second (d) the colour of light
2. 2.🧮 A 1.2 V battery is joined to 4 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
3. 3.🔁 count = 1
   repeat 10 times { count = count + 9 }
   What is count at the end?
4. 4.🔺 A current of 20 mA flows when 4.4 V is joined across a resistor. What is its resistance (in ohms)?
5. 5.Which of these is an insulator? (a) a rubber band (b) a safety pin (c) a copper wire (d) a graphite rod
6. 6.Which of these has no microcontroller inside? (a) a digital thermometer (b) a microwave oven (c) a digital alarm clock (d) a wind-up toy
7. 7.What does a toggle switch do? (a) closes when tipped over (b) stays where you flip it (c) slides side to side (d) closes near a magnet
8. 8.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a safety pin. Does the bulb glow? (a) No (b) Yes
9. 9.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) none (c) two (d) one
10. 10.🌐 A weather station sends one reading every 10 seconds. How many readings does it send in 7 minutes?
11. 11.🔘 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 ON. Does the bulb glow? (a) Yes (b) No
12. 12.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 410 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
13. 13.⚠️ About how many volts do home sockets in India supply? (a) 1.5 V (b) 12 V (c) 9 V (d) 230 V
14. 14.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a light sensor (c) a rain sensor (d) a distance sensor
15. 15.Which of these is a conductor? (a) a glass marble (b) a rubber eraser (c) a plastic straw (d) a steel coin
16. 16.True or false: to use mains for a project is safe. (a) False (b) True
17. 17.🔌 Is a rubber eraser a conductor or an insulator? (a) an insulator (b) a conductor
18. 18.🔘 Which kind of switch closes near a magnet? (a) a reed switch (b) a push button (c) a tilt switch (d) a toggle switch
19. 19.⚠️ Is it safe to build with an adult near? (a) safe (b) not safe
20. 20.🔘 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 OFF, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
21. 21.🔋 Does an air conditioner give electricity or use electricity? (a) gives electricity (b) uses electricity
22. 22.🧩 Which component blows if current is high? (a) fuse (b) LED (c) potentiometer (d) buzzer
23. 23.🔢 To run one loop of a plant-watering program, which is the LAST step? (a) wait a few seconds (b) switch the pump on/off (c) read the soil sensor (d) compare with the limit
24. 24.True or false: if the loop is complete, the circuit is closed and current flows. (a) False (b) True
25. 25.True or false: the push of a cell is measured in amperes (A). (a) True (b) False
26. 26.⏱️ A program says “wait 8750 ms”. How many seconds is that? =
27. 27.💡 Why is house wiring done in parallel? (a) so all go off together (b) to save copper only (c) to make bulbs dim (d) each gets full voltage
28. 28.🔌 Is a ceramic cup a conductor or an insulator? (a) an insulator (b) a conductor
29. 29.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) resistor (b) voltmeter (c) switch (d) diode
30. 30.🔺 In the V-I-R triangle, how do we find R? (a) R = I ÷ V (b) R = V + I (c) R = V ÷ I (d) R = V × I
31. 31.True or false: a push button works only while pressed. (a) False (b) True
32. 32.True or false: triangle, bar and arrows is the symbol for a switch. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a steel spoon (b) a copper wire (c) a cotton thread (d) a steel coin
34. 34.⏱️ How many milliseconds is a wait of 1 seconds?
35. 35.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) False (b) True
36. 36.Which job needs a soil moisture sensor? (a) water a dry plant (b) warn of a gas leak (c) close a window in rain (d) switch on with a clap
37. 37.Which of these is true of a series circuit? (a) one out, the rest glow (b) each gets the full volts (c) used in house wiring (d) one bulb out, all go out
38. 38.📏 How many amperes (A) is 2400 mA? =
39. 39.⏱️ How many milliseconds is a wait of 4.7 seconds?
40. 40.🔌 Is a copper wire a conductor or an insulator? (a) a conductor (b) an insulator

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