Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 698 · 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.🔐 Is it a good or a risky habit to reuse one password? (a) risky habit (b) good habit
2. 2.What does a toggle switch do? (a) stays where you flip it (b) closes near a magnet (c) springs back when let go (d) slides side to side
3. 3.🔍 Which is the odd one out? (a) keep drinks far away (b) take cells out after use (c) touch a switch when wet (d) fly kites in open fields
4. 4.🌈 In the resistor colour code, which number does violet stand for?
5. 5.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
6. 6.🌈 A resistor has the colour bands red, blue, orange. What is its value (in ohms)?
7. 7.🔺 A current of 40 mA flows when 4.8 V is joined across a resistor. What is its resistance (in ohms)?
8. 8.True or false: “the fan starts” is the output. (a) True (b) False
9. 9.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 1000 (c) 10 (d) 60
10. 10.🔁 repeat 4 times { repeat 6 times { beep } }
    How many beeps are there?
11. 11.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
12. 12.Which of these usually has a microcontroller inside? (a) a bicycle bell (b) a candle (c) a spinning top (d) a washing machine
13. 13.⏱️ repeat 2 times { buzzer ON; wait 400 ms; buzzer OFF; wait 600 ms }
    How many milliseconds does this take in all?
14. 14.🔋 What should you do with used-up cells? (a) cut them open (b) bury them in soil (c) throw them in a fire (d) give them for recycling
15. 15.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) bulb (b) ammeter (c) diode (d) LED
16. 16.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) switch (b) bulb (c) wire (d) resistor
17. 17.🤖 Does a spinning top usually have a microcontroller inside? (a) No (b) Yes
18. 18.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a safe circuit (b) an open circuit (c) a parallel circuit (d) a short circuit
19. 19.True or false: a buzzer makes a beeping sound. (a) False (b) True
20. 20.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
21. 21.🧮 A 2.5 V battery is joined to 2 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
22. 22.True or false: to keep factory passwords is a risky habit. (a) False (b) True
23. 23.🧩 Which component senses how bright it is? (a) resistor (b) potentiometer (c) transistor (d) LDR
24. 24.True or false: to set a strong password is a good habit. (a) True (b) False
25. 25.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) the loop is complete (c) a cell is taken out (d) a wire is cut
26. 26.⚡ What does a toaster mainly change electricity into? (a) sound (b) movement (c) heat (d) light
27. 27.🧩 Which part changes electrical energy into sound? (a) a buzzer (b) a diode (c) a resistor (d) a capacitor
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) run fans in empty rooms
29. 29.Which of these is a good habit? (a) keep factory passwords (b) tap unknown app links (c) share only needed data (d) post your live location
30. 30.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 23 °C. What is shown? (a) Hot (b) Warm (c) Cool
31. 31.🔍 Which is the odd one out? (a) a plastic ruler (b) a graphite rod (c) a rubber band (d) a glass marble
32. 32.🔘 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 OFF, B is OFF and C is ON. Does the bulb glow? (a) Yes (b) No
33. 33.🔁 count = 9
    repeat 9 times { count = count + 6 }
    What is count at the end?
34. 34.True or false: a tilt switch closes near a magnet. (a) True (b) False
35. 35.Which drawing is the symbol for an ammeter? (a) triangle, bar and arrows (b) a dot where wires meet (c) a circle with A inside (d) two or more cell symbols
36. 36.🔺 A current of 10 mA flows when 2.2 V is joined across a resistor. What is its resistance (in ohms)?
37. 37.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in series (c) not joined (d) in parallel
38. 38.⏱️ How many milliseconds is a wait of 1.4 seconds?
39. 39.True or false: to dry your hands first is not safe. (a) True (b) False
40. 40.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?

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