Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 838 · 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 bulb out, all go out (c) own switch for each bulb (d) each gets the full volts
2. 2.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
3. 3.🧮 Two equal 40 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
4. 4.🔍 Which is the odd one out? (a) a plastic straw (b) a rubber band (c) a ceramic cup (d) aluminium foil
5. 5.🔌 Why are electric wires covered in plastic? (a) plastic is an insulator (b) plastic is a conductor (c) to make them heavy (d) plastic makes current
6. 6.🔁 What does a variable do in a program? (a) measures light (b) joins two wires (c) blinks an LED (d) stores a value
7. 7.🔦 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 steel spoon. Does the bulb glow? (a) No (b) Yes
8. 8.📏 In the water-pipe picture of a circuit, voltage is like … (a) the tap handle (b) the water tank lid (c) the water pressure (d) the pipe colour
9. 9.🔁 repeat 2 times { repeat 2 times { beep } }
   How many beeps are there?
10. 10.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
11. 11.🔍 Which is the odd one out? (a) set a strong password (b) log out of shared phones (c) keep factory passwords (d) turn off unused gadgets
12. 12.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a battery (d) a resistor
13. 13.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) stay the same (c) smaller (d) bigger
14. 14.True or false: a rubber band is an insulator. (a) False (b) True
15. 15.🔘 Which kind of switch closes when tipped over? (a) a toggle switch (b) a push button (c) a tilt switch (d) a slide switch
16. 16.True or false: the flow of charge is measured in ohms (Ω). (a) True (b) False
17. 17.🧩 Which component glows using little power? (a) LED (b) thermistor (c) motor (d) capacitor
18. 18.🔍 Which is the odd one out? (a) a toaster (b) an LED lamp (c) a water heater (d) an electric kettle
19. 19.📏 Voltmeter or ammeter: which one measures current? (a) ammeter (b) voltmeter
20. 20.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
21. 21.🔢 To run one loop of a plant-watering program, which is the FIRST step? (a) read the soil sensor (b) wait a few seconds (c) compare with the limit (d) switch the pump on/off
22. 22.🔘 Which kind of switch stays where you flip it? (a) a toggle switch (b) a push button (c) a tilt switch (d) a reed switch
23. 23.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
24. 24.🔺 A current of 0.1 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
25. 25.Which of these is a conductor? (a) a ceramic cup (b) a paper strip (c) a brass key (d) a wooden stick
26. 26.True or false: a slide switch springs back when let go. (a) True (b) False
27. 27.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) gets smaller (c) becomes zero (d) stays the same
28. 28.🔁 x = 5
    repeat 3 times { x = x × 2 }
    What is x at the end?
29. 29.True or false: a resistor limits the current. (a) True (b) False
30. 30.🔢 To run one loop of a plant-watering program, which comes first: “switch the pump on/off” or “wait a few seconds”? (a) wait a few seconds (b) switch the pump on/off
31. 31.True or false: on a cell, “the flat end” means the + (positive) end. (a) False (b) True
32. 32.True or false: current is measured in watts (W). (a) True (b) False
33. 33.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a distance sensor (c) a motion sensor (d) a soil moisture sensor
34. 34.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a rain sensor (c) a sound sensor (d) a distance sensor
36. 36.🔐 Is it a good or a risky habit to post your live location? (a) good habit (b) risky habit
37. 37.🌐 Is a plain table fan an IoT device? (a) an IoT device (b) not an IoT device
38. 38.🤖 “if (A AND B)” is true when … (a) only B is true (b) both are false (c) only A is true (d) both A and B are true
39. 39.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) neither part (b) the else part (c) the if part (d) both parts
40. 40.🔋 Does a washing machine give electricity or use electricity? (a) gives electricity (b) uses electricity

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