Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 360 · 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.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a fuse or MCB (b) a long wire (c) a bulb (d) a plug top
2. 2.⚠️ About how many volts do home sockets in India supply? (a) 230 V (b) 12 V (c) 9 V (d) 1.5 V
3. 3.🤖 Does a toy robot usually have a microcontroller inside? (a) No (b) Yes
4. 4.🔁 repeat 5 times { repeat 4 times { beep } }
   How many beeps are there?
5. 5.🔗 Series or parallel circuit: “each gets the full volts”? (a) parallel (b) series
6. 6.⚠️ Is it safe to open a phone charger? (a) not safe (b) safe
7. 7.🌈 In the resistor colour code, which number does violet stand for?
8. 8.📏 How many watts (W) is 3.7 kW?
9. 9.🧮 Resistors of 100 Ω, 50 Ω, 100 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
10. 10.True or false: the ammeter is joined across a part. (a) True (b) False
11. 11.🔺 A current of 10 mA flows when 3.3 V is joined across a resistor. What is its resistance (in ohms)?
12. 12.True or false: a doorbell mainly makes movement. (a) False (b) True
13. 13.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
14. 14.⏱️ A program says “wait 7250 ms”. How many seconds is that? =
15. 15.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) − (negative) (b) + (positive)
16. 16.🔋 How many 1.2 V cells must be joined in series to give 6 V?
17. 17.Which of these mainly makes sound? (a) an electric kettle (b) a school bell (c) a street light (d) a torch
18. 18.Which of these mainly gives out heat? (a) an exhaust fan (b) an electric iron (c) a tube light (d) a school bell
19. 19.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
20. 20.🤖 Microcontroller or laptop: which one has a built-in keyboard? (a) laptop (b) microcontroller
21. 21.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
22. 22.⚡ What does a room heater mainly change electricity into? (a) heat (b) light (c) movement (d) sound
23. 23.🔁 total = 0
    for i = 1 to 10 { total = total + i }
    What is total at the end?
24. 24.🔺 A current of 10 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
25. 25.🔌 A gap of dry air between two wires acts as … (a) a cell (b) a switch that is ON (c) a conductor (d) an insulator
26. 26.🔁 repeat 6 times { repeat 4 times { beep } }
    How many beeps are there?
27. 27.🔍 Which is the odd one out? (a) a buzzer (b) an LED (c) a turning knob (d) a motor
28. 28.💡 What does LED stand for? (a) large electric dial (b) low energy device (c) light energy dial (d) light-emitting diode
29. 29.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a metal paper clip. Does the bulb glow? (a) No (b) Yes
30. 30.⚠️ Who should be with you when you build a circuit? (a) nobody (b) a younger child (c) a stranger online (d) a trusted adult
31. 31.🔘 A cell and a bulb are joined to 3 side-by-side paths with one switch on each path — A, B and C (parallel). A is ON, B is OFF and C is ON. Does the bulb glow? (a) No (b) Yes
32. 32.🔍 Which is the odd one out? (a) share only needed data (b) cover unused cameras (c) tap unknown app links (d) change default passwords
33. 33.🔍 Which is the odd one out? (a) use a cable with cuts (b) touch a switch when wet (c) climb an electric pole (d) take cells out after use
34. 34.🔁 What do we call a circuit with a break in it? (a) a full circuit (b) a series circuit (c) an open circuit (d) a closed circuit
35. 35.🔍 Which is the odd one out? (a) an exhaust fan (b) an electric drill (c) a tube light (d) an electric toy car
36. 36.🌈 A resistor has the colour bands yellow, white, red. What is its value (in ohms)?
37. 37.🧩 Which component lets current go one way? (a) LDR (b) diode (c) potentiometer (d) motor
38. 38.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) a break stops every bulb (c) each gets the full volts (d) one bulb out, all go out
39. 39.🤖 “if (A AND B)” is true when … (a) both are false (b) only A is true (c) only B is true (d) both A and B are true
40. 40.💡 A battery lights 5 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same

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