Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 816 · 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 does a slide switch do? (a) springs back when let go (b) stays where you flip it (c) closes near a magnet (d) slides side to side
2. 2.🤖 if (temperature > 32) { fan ON } else { fan OFF }
   The temperature sensor reads 36 °C. What happens? (a) fan OFF (b) fan ON
3. 3.True or false: a steel spoon is an insulator. (a) True (b) False
4. 4.🔁 count = 5
   while (count < 13) { count = count + 4 }
   How many times does the loop run?
5. 5.🔁 count = 2
   while (count < 18) { count = count + 4 }
   How many times does the loop run?
6. 6.📏 Which unit measures the flow of charge? (a) ampere (A) (b) ohm (Ω) (c) watt (W) (d) volt (V)
7. 7.Which of these gives us electricity? (a) a washing machine (b) a television (c) a mobile phone (d) a power station
8. 8.💡 An LED is joined to a 9 V battery with no resistor; the leg next to the flat edge of its rim goes to the − side. What happens? (a) does not light (b) lights up (c) may burn out
9. 9.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) two (c) one (d) none
10. 10.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
11. 11.🔁 repeat 3 times { repeat 2 times { beep } }
    How many beeps are there?
12. 12.🔺 A current of 0.2 A flows when 0.6 V is joined across a resistor. What is its resistance (in ohms)?
13. 13.True or false: a microwave oven usually has a microcontroller inside. (a) True (b) False
14. 14.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) output (b) input (c) process
15. 15.True or false: an electric kettle mainly makes movement. (a) True (b) False
16. 16.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
17. 17.🧮 Five equal 125 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
18. 18.🔌 A gap of dry air between two wires acts as … (a) a cell (b) an insulator (c) a conductor (d) a switch that is ON
19. 19.Which of these is the process? (a) a button press (b) the fan starts (c) a motion sensor signal (d) decide if soil is dry
20. 20.True or false: to use a cable with cuts is safe. (a) True (b) False
21. 21.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
22. 22.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
23. 23.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a light sensor (c) a distance sensor (d) a soil moisture sensor
24. 24.🌐 What does IoT stand for? (a) Internet of Talk (b) Input of Tools (c) Internet of Things (d) Inside of Toys
25. 25.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) each gets full voltage (c) to save copper only (d) so all go off together
26. 26.True or false: a straight line is the symbol for a wire. (a) True (b) False
27. 27.Which of these is an IoT device? (a) a plain table fan (b) an app-controlled bulb (c) a paper calendar (d) a pencil sharpener
28. 28.True or false: a slide switch stays where you flip it. (a) True (b) False
29. 29.Which job needs a motor? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) move water to plants
30. 30.Which drawing is the symbol for an ammeter? (a) a long and a short line (b) a circle with A inside (c) triangle, bar and arrows (d) a straight line
31. 31.⚡ A solar panel changes which kind of energy into electricity? (a) wind energy (b) sound energy (c) light energy (d) chemical energy
32. 32.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 50 % (c) 5 % (d) 0 %
33. 33.True or false: a paper strip is an insulator. (a) True (b) False
34. 34.🔘 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 OFF (d) only when both are ON
35. 35.💡 Why does an LED need a resistor in series? (a) to make it brighter (b) to store charge (c) to change its colour (d) to limit the current
36. 36.🤖 “if (A AND B)” is true when … (a) both are false (b) both A and B are true (c) only B is true (d) only A is true
37. 37.🧮 A 330 Ω resistor is joined in series with two equal 330 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
38. 38.🔌 Is a paper strip a conductor or an insulator? (a) an insulator (b) a conductor
39. 39.🗺️ In an input → process → output plan, is “a button press” the input, the process or the output? (a) input (b) process (c) output
40. 40.🔺 A current of 25 mA flows when 5.5 V is joined across a resistor. What is its resistance (in ohms)?

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