Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 263 · 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.💡 3 identical bulbs are joined in series with a 12 V battery (ideal wires). How many volts does each bulb get? =
2. 2.💡 In a series circuit, how many paths does the current have? (a) none (b) one (c) two (d) one for each bulb
3. 3.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
4. 4.🔍 Which is the odd one out? (a) a light level reading (b) compare with a limit (c) a temperature reading (d) a button press
5. 5.🔺 A 10 V supply is joined across a 250 Ω resistor. What current flows (in milliamperes, mA)?
6. 6.🔐 A smart-camera app asks for your school name and home address. What should you do? (a) post it online (b) share it with friends (c) type it all in (d) ask a parent first
7. 7.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
8. 8.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a distance sensor (c) a rain sensor (d) a gas sensor
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
10. 10.Which of these is safe? (a) fly kites in open fields (b) throw cells in a fire (c) climb an electric pole (d) open a phone charger
11. 11.🔁 total = 0
    for i = 1 to 8 { total = total + i }
    What is total at the end?
12. 12.🔺 In the V-I-R triangle, how do we find R? (a) R = V × I (b) R = V + I (c) R = I ÷ V (d) R = V ÷ I
13. 13.Which drawing is the symbol for an ammeter? (a) a circle with a cross (b) a plain rectangle (c) two equal parallel lines (d) a circle with A inside
14. 14.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 17 °C. What is shown? (a) Cool (b) Hot (c) Warm
15. 15.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 60 (c) 100 (d) 1000
16. 16.Which of these is a risky habit? (a) turn off unused gadgets (b) share the Wi-Fi key (c) log out of shared phones (d) set a strong password
17. 17.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 23 °C. What is shown? (a) Warm (b) Hot (c) Cool
18. 18.🔁 What does “count = count + 1” do? (a) sets count to 1 (b) prints 1 (c) adds 1 to count (d) takes 1 away
19. 19.🔺 A current of 40 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
21. 21.True or false: to water a dry plant, use a distance sensor. (a) False (b) True
22. 22.📏 How many ohms (Ω) is 7.4 kΩ?
23. 23.🧩 Which component makes a beeping sound? (a) motor (b) LED (c) buzzer (d) capacitor
24. 24.Which of these mainly gives out light? (a) a torch (b) a school bell (c) an exhaust fan (d) a water heater
25. 25.True or false: to share camera links is a good habit. (a) False (b) True
26. 26.🔌 Is a paper strip a conductor or an insulator? (a) an insulator (b) a conductor
27. 27.What does a push button do? (a) springs back when let go (b) stays where you flip it (c) closes near a magnet (d) flips up or down
28. 28.True or false: on an LED, the longer leg is the anode (+). (a) False (b) True
29. 29.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
30. 30.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
31. 31.Which of these is measured in ohms (Ω)? (a) voltage (b) resistance (c) the push of a cell (d) power
32. 32.🔍 Which is the odd one out? (a) stay away from pylons (b) touch a fallen wire (c) use small battery cells (d) take cells out after use
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.Which of these is measured in amperes (A)? (a) the push of a cell (b) resistance (c) current (d) how much a part resists
35. 35.📶 A pin that reads a push button is set as … (a) a battery (b) a resistor (c) an input (d) an output
36. 36.Which job is done by the voltage regulator? (a) keeps the voltage steady (b) brings power and code (c) runs the program (d) connect sensors and LEDs
37. 37.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
38. 38.📏 How many amperes (A) is 2420 mA? =
39. 39.What does a capacitor do? (a) has coloured bands (b) glows using little power (c) makes things spin (d) smooths a wobbly supply
40. 40.🔋 Does a wind turbine give electricity or use electricity? (a) gives electricity (b) uses electricity

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