Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 768 · 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.Which of these is true of a series circuit? (a) many paths for current (b) one out, the rest glow (c) used in house wiring (d) one bulb out, all go out
2. 2.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
3. 3.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is ON, B is OFF, C is ON and D is ON. Does the bulb glow? (a) No (b) Yes
4. 4.🔺 A current of 10 mA flows when 5 V is joined across a resistor. What is its resistance (in ohms)?
5. 5.📏 Which unit measures energy used each second? (a) ohm (Ω) (b) volt (V) (c) ampere (A) (d) watt (W)
6. 6.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
7. 7.🤖 What is a microcontroller? (a) a kind of bulb (b) a big desktop computer (c) a type of battery (d) a computer on one chip
8. 8.🌈 Which band is read first on a resistor? (a) the widest gap (b) any band (c) the gold band (d) the one nearest an end
9. 9.True or false: the voltmeter measures voltage. (a) True (b) False
10. 10.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) junction (b) voltmeter (c) motor (d) ammeter
11. 11.⏱️ What does “wait 500 ms” do? (a) pauses for half a second (b) turns the LED off (c) waits 500 seconds (d) blinks 500 times
12. 12.True or false: a microcontroller has a built-in keyboard. (a) True (b) False
13. 13.🧮 Resistors of 10 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
14. 14.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
15. 15.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
16. 16.True or false: on an LED, the shorter leg is the anode (+). (a) False (b) True
17. 17.True or false: a wooden stick is an insulator. (a) True (b) False
18. 18.Which job is done by the main chip? (a) connect sensors and LEDs (b) keeps the voltage steady (c) restarts the program (d) runs the program
19. 19.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) neither part (b) both parts (c) the if part (d) the else part
20. 20.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) one bulb out, all go out (c) one out, the rest glow (d) a single current path
21. 21.⚡ What does an exhaust fan mainly change electricity into? (a) movement (b) heat (c) light (d) sound
22. 22.🔍 Which is the odd one out? (a) a rubber eraser (b) a plastic straw (c) a plastic ruler (d) an iron nail
23. 23.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
24. 24.Which job is done by the reset button? (a) keeps the voltage steady (b) shows the board is on (c) runs the program (d) restarts the program
25. 25.🔐 Is it a good or a risky habit to set a strong password? (a) risky habit (b) good habit
26. 26.True or false: a school bell mainly makes movement. (a) False (b) True
27. 27.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) not joined (c) in series (d) in parallel
28. 28.Which of these is the output? (a) a temperature reading (b) the fan starts (c) a button press (d) count button presses
29. 29.⚡ What does a street light mainly change electricity into? (a) light (b) heat (c) movement (d) sound
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 ON, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
31. 31.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. Does the bulb glow? (a) No (b) Yes
32. 32.🔦 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 graphite rod. Does the bulb glow? (a) No (b) Yes
33. 33.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a display (c) a pump (d) an LED
34. 34.🔌 Which metal is used for most electric wires at home? (a) glass (b) plastic (c) copper (d) rubber
35. 35.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 9 cm. What happens? (a) buzzer beeps (b) buzzer is silent
36. 36.True or false: the flow of charge is measured in volts (V). (a) False (b) True
37. 37.📏 How many kilo-ohms (kΩ) is 9800 Ω? =
38. 38.Which of these mainly gives out heat? (a) an LED lamp (b) a torch (c) a street light (d) a room heater
39. 39.🔋 7 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
40. 40.Which of these is a conductor? (a) a paper strip (b) a rubber eraser (c) a safety pin (d) a plastic straw

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