Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 333 · 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 1 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
2. 2.🔍 Which is the odd one out? (a) a water pump (b) a motion sensor (c) a motor (d) a buzzer
3. 3.Which job is done by the pins? (a) runs the program (b) restarts the program (c) shows the board is on (d) connect sensors and LEDs
4. 4.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
5. 5.🔋 What should you do with used-up cells? (a) bury them in soil (b) cut them open (c) throw them in a fire (d) give them for recycling
6. 6.True or false: a microcontroller uses very little power. (a) True (b) False
7. 7.True or false: to keep factory passwords is a risky habit. (a) False (b) True
8. 8.Which of these is a good habit? (a) reuse one password (b) read app permissions (c) tap unknown app links (d) share the Wi-Fi key
9. 9.📏 How many ohms (Ω) is 5.2 kΩ?
10. 10.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) both lines (c) the longer line (d) neither line
11. 11.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) becomes zero (c) gets smaller (d) stays the same
12. 12.🔋 How many volts does one ordinary torch cell give? (a) 230 V (b) 0.5 V (c) 1.5 V (d) 15 V
13. 13.🤖 Microcontroller or laptop: which one has a built-in keyboard? (a) laptop (b) microcontroller
14. 14.🔺 A current of 0.5 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
15. 15.Which drawing is the symbol for a resistor? (a) a circle with V inside (b) a circle with a cross (c) many long-short pairs (d) a small empty box
16. 16.What does the cloud server do? (a) shows data to you (b) stores data online (c) acts on a command (d) measures the real world
17. 17.What does a toggle switch do? (a) closes near a magnet (b) closes when tipped over (c) stays where you flip it (d) slides side to side
18. 18.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) False (b) True
19. 19.🌐 A weather station sends one reading every 15 seconds. How many readings does it send in 1 minute?
20. 20.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 350 ms }
    How many milliseconds does one blink (ON + OFF) take?
21. 21.🔁 x = 3
    repeat 2 times { x = x × 2 }
    What is x at the end?
22. 22.🔺 A 2.4 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
23. 23.🔁 What does “count = count + 1” do? (a) sets count to 1 (b) takes 1 away (c) adds 1 to count (d) prints 1
24. 24.🤖 Does a wind-up toy usually have a microcontroller inside? (a) Yes (b) No
25. 25.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
26. 26.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 22 °C. What is shown? (a) Warm (b) Hot (c) Cool
27. 27.🔍 Which is the odd one out? (a) stay away from pylons (b) climb an electric pole (c) touch a switch when wet (d) open a phone charger
28. 28.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) shout for an adult (b) pour water on them (c) wait and watch (d) pull them by the hand
29. 29.💡 In a series circuit, how many paths does the current have? (a) two (b) none (c) one for each bulb (d) one
30. 30.🔘 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
31. 31.🔘 Which kind of switch closes near a magnet? (a) a tilt switch (b) a slide switch (c) a reed switch (d) a push button
32. 32.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
33. 33.⏱️ How many milliseconds is a wait of 4.8 seconds?
34. 34.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they explode (c) they get dimmer (d) they keep glowing
35. 35.⚡ Which formula gives electric power? (a) P = V + I (b) P = V × I (c) P = I ÷ V (d) P = V ÷ I
36. 36.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
37. 37.🔘 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 ON and C is OFF. Does the bulb glow? (a) No (b) Yes
38. 38.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
39. 39.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
40. 40.🔋 What is a battery? (a) two or more cells joined (b) a kind of bulb (c) a switch with a lid (d) one single wire

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