Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 524 · 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.🔺 A current of 0.5 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
2. 2.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) when either is ON (b) only when both are ON (c) only when both are OFF (d) never
3. 3.What does a push button do? (a) slides side to side (b) stays where you flip it (c) springs back when let go (d) flips up or down
4. 4.🔘 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
5. 5.🔢 To run one loop of a plant-watering program, which is the LAST step? (a) read the soil sensor (b) wait a few seconds (c) compare with the limit (d) switch the pump on/off
6. 6.🔁 What does “count = count + 1” do? (a) adds 1 to count (b) sets count to 1 (c) takes 1 away (d) prints 1
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
8. 8.🔁 count = 10
   repeat 4 times { count = count + 3 }
   What is count at the end?
9. 9.🔍 Which is the odd one out? (a) a metal paper clip (b) a steel spoon (c) a copper wire (d) a plastic ruler
10. 10.💡 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
    Is the LED ON or OFF at the end? (a) OFF (b) ON
11. 11.🔗 Series or parallel circuit: “used in house wiring”? (a) series (b) parallel
12. 12.📏 How many kilo-ohms (kΩ) is 8100 Ω? =
13. 13.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
14. 14.🤖 Which is a safe power source for a beginner microcontroller board? (a) bare mains wires (b) a 230 V cable (c) a wall socket directly (d) USB or a 9 V battery
15. 15.🔺 A current of 1 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
16. 16.Which of these is the output? (a) count button presses (b) a motion sensor signal (c) compare with a limit (d) the pump turns on
17. 17.True or false: a microcontroller runs one small program. (a) True (b) False
18. 18.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) the longer line (c) both lines (d) neither line
19. 19.⚡ What does a tube light mainly change electricity into? (a) heat (b) movement (c) light (d) sound
20. 20.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 27 °C. What is shown? (a) Hot (b) Warm (c) Cool
21. 21.🔘 Which kind of switch works only while pressed? (a) a slide switch (b) a toggle switch (c) a push button (d) a tilt switch
22. 22.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) one (d) two
23. 23.Which job needs a buzzer? (a) open a gate to 90° (b) show the temperature (c) spin a robot’s wheels (d) beep an alarm
24. 24.🔐 Is it a good or a risky habit to set up with a parent? (a) risky habit (b) good habit
25. 25.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) by Wi-Fi (c) in series (d) in parallel
26. 26.✏️ In a circuit diagram, which part is drawn as a straight line? (a) switch (b) battery (c) wire (d) voltmeter
27. 27.🔐 Is it a good or a risky habit to log out of shared phones? (a) risky habit (b) good habit
28. 28.📏 Which unit measures the push of a cell? (a) ohm (Ω) (b) ampere (A) (c) watt (W) (d) volt (V)
29. 29.⚡ Which tiny particles drift along a metal wire to carry the current? (a) electrons (b) water drops (c) photons (d) dust particles
30. 30.🔘 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 ON and C is OFF. Does the bulb glow? (a) Yes (b) No
31. 31.🔁 What do we call a circuit with a break in it? (a) an open circuit (b) a full circuit (c) a closed circuit (d) a series circuit
32. 32.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) voltmeter (b) LED (c) motor (d) capacitor
33. 33.🔗 Series or parallel circuit: “a single current path”? (a) series (b) parallel
34. 34.🔘 Which kind of switch closes when tipped over? (a) a reed switch (b) a push button (c) a toggle switch (d) a tilt switch
35. 35.🔁 What does a variable do in a program? (a) stores a value (b) measures light (c) joins two wires (d) blinks an LED
36. 36.True or false: “own switch for each bulb” is true of a series circuit. (a) True (b) False
37. 37.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the filament (b) the glass (c) the switch (d) the base
38. 38.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 2 glow? (a) Yes (b) No
39. 39.True or false: triangle, bar and arrows is the symbol for an LED. (a) False (b) True
40. 40.True or false: a metal paper clip is an insulator. (a) False (b) True

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