Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 942 · 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 resistor has the colour bands yellow, orange, brown. What is its value (in ohms)?
2. 2.🔋 How many 2 V cells must be joined in series to give 16 V?
3. 3.What does a resistor do? (a) senses how bright it is (b) turns a fan or wheels (c) glows using little power (d) limits the current
4. 4.🌈 A resistor has the colour bands brown, black, orange. What is its value in kilo-ohms (kΩ)? =
5. 5.True or false: “how loud a sound is” is an analog signal. (a) True (b) False
6. 6.True or false: to tap unknown app links is a risky habit. (a) True (b) False
7. 7.🧩 Which component turns a fan or wheels? (a) capacitor (b) motor (c) LED (d) potentiometer
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
9. 9.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 60 (c) 100 (d) 1000
10. 10.🗺️ Before building a project, what should you write down first? (a) inputs and outputs (b) the final price (c) the box colour (d) nothing at all
11. 11.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) a break stops every bulb (c) a single current path (d) one out, the rest glow
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a display (c) a pump (d) an LED
13. 13.🔺 A current of 20 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
14. 14.🔋 4 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
15. 15.⏱️ loop forever { LED ON; wait 850 ms; LED OFF; wait 350 ms }
    How many milliseconds does one blink (ON + OFF) take?
16. 16.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a capacitor (c) a diode (d) a buzzer
17. 17.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) a bigger voltage (c) the same voltage (d) no voltage
18. 18.🧩 A capacitor in a circuit can … (a) store charge briefly (b) make light (c) measure heat (d) spin a wheel
19. 19.🌐 What does IoT stand for? (a) Input of Tools (b) Inside of Toys (c) Internet of Talk (d) Internet of Things
20. 20.🧮 Resistors of 220 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
21. 21.⚠️ Who should be with you when you build a circuit? (a) a younger child (b) a stranger online (c) nobody (d) a trusted adult
22. 22.Which of these is not safe? (a) keep drinks far away (b) build with an adult near (c) touch a switch when wet (d) use small battery cells
23. 23.🤖 Does a hand pump usually have a microcontroller inside? (a) Yes (b) No
24. 24.🤖 Microcontroller or laptop: which one needs much more power? (a) microcontroller (b) laptop
25. 25.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
26. 26.True or false: to post your live location is a good habit. (a) True (b) False
27. 27.🔘 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 ON. Does the bulb glow? (a) Yes (b) No
28. 28.📶 Digital or analog: the room temperature? (a) digital (b) analog
29. 29.🧮 A 10 Ω resistor is joined in series with two equal 330 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
30. 30.🔺 A current of 2 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
31. 31.🗺️ In an input → process → output plan, is “a buzzer beeps” the input, the process or the output? (a) process (b) output (c) input
32. 32.True or false: the flow of charge is measured in volts (V). (a) True (b) False
33. 33.⚡ A cell changes stored chemical energy into which kind of energy? (a) electrical energy (b) wind energy (c) nuclear energy (d) sound energy
34. 34.🔍 Which is the odd one out? (a) an electric toy car (b) a toaster (c) a room heater (d) an electric kettle
35. 35.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
36. 36.Which job is done by the power LED? (a) shows the board is on (b) runs the program (c) keeps the voltage steady (d) brings power and code
37. 37.True or false: “a single current path” is true of a series circuit. (a) False (b) True
38. 38.🌈 A resistor has the colour bands white, orange, red. What is its value in kilo-ohms (kΩ)? =
39. 39.🔺 A current of 10 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
40. 40.Which of these is not safe? (a) keep drinks far away (b) climb an electric pole (c) fly kites in open fields (d) stop if a part gets hot

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