Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 946 · 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.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
2. 2.📏 In the water-pipe picture of a circuit, voltage is like … (a) the water tank lid (b) the tap handle (c) the water pressure (d) the pipe colour
3. 3.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
4. 4.🌐 What does IoT stand for? (a) Internet of Talk (b) Input of Tools (c) Inside of Toys (d) Internet of Things
5. 5.True or false: one tall, one short bar is the symbol for a cell. (a) False (b) True
6. 6.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a servo motor (c) a pump (d) a buzzer
7. 7.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) stay the same (c) bigger (d) zero
8. 8.🔍 Which is the odd one out? (a) a night lamp (b) a street light (c) an electric iron (d) a tube light
9. 9.🗺️ Before building a project, what should you write down first? (a) nothing at all (b) inputs and outputs (c) the box colour (d) the final price
10. 10.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown? (a) Cool (b) Hot (c) Warm
11. 11.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
12. 12.True or false: to fly kites in open fields is not safe. (a) True (b) False
13. 13.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 1 glow? (a) No (b) Yes
14. 14.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
15. 15.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
16. 16.⚡ A 9 W device works on 9 V. What current does it take (in amperes)? =
17. 17.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) only one (b) none (c) it does not matter (d) both of them
18. 18.🔐 Is it a good or a risky habit to accept every permission? (a) risky habit (b) good habit
19. 19.🧮 A 1.2 V battery is joined to 6 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
20. 20.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) the same voltage (c) a bigger voltage (d) no voltage
21. 21.🔍 Which is the odd one out? (a) touch a fallen wire (b) open a phone charger (c) use mains for a project (d) stop if a part gets hot
22. 22.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
23. 23.🔺 A current of 2.5 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
24. 24.True or false: a potentiometer is a resistance knob. (a) True (b) False
25. 25.True or false: on an LED, the longer leg is the anode (+). (a) True (b) False
26. 26.🔺 A current of 40 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
27. 27.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
28. 28.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
29. 29.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
30. 30.💡 An LED is joined to a 6 V battery through a 220 Ω resistor; the leg next to the flat edge of its rim goes to the + side. What happens? (a) does not light (b) may burn out (c) lights up
31. 31.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 350. What happens? (a) lamp OFF (b) lamp ON
32. 32.Which of these is a good habit? (a) share the Wi-Fi key (b) ignore update messages (c) accept every permission (d) set a strong password
33. 33.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
34. 34.🔁 repeat 6 times { repeat 2 times { beep } }
    How many beeps are there?
35. 35.🔗 Series or parallel circuit: “many paths for current”? (a) series (b) parallel
36. 36.✏️ In a circuit diagram, wires are usually drawn as … (a) straight lines (b) dotted circles (c) wavy lines (d) little stars
37. 37.True or false: on a cell, “the flat end” means the + (positive) end. (a) True (b) False
38. 38.True or false: a laptop runs one small program. (a) False (b) True
39. 39.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
40. 40.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) when either is ON (b) only when both are OFF (c) only when both are ON (d) never

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