Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 735 · 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.✏️ In a circuit diagram, which part is drawn as a circle with V inside? (a) wire (b) diode (c) switch (d) voltmeter
2. 2.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets smaller (b) stays the same (c) gets bigger (d) becomes zero
3. 3.True or false: to share the Wi-Fi key is a good habit. (a) True (b) False
4. 4.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
5. 5.🔋 A 3 V battery and three 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
6. 6.⚡ What does a traffic signal mainly change electricity into? (a) movement (b) heat (c) light (d) sound
7. 7.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) both of them (b) none (c) only one (d) it does not matter
8. 8.🔁 x = 3
   repeat 3 times { x = x × 2 }
   What is x at the end?
9. 9.True or false: on a cell, “the longer symbol line” means the + (positive) end. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) a cotton thread (b) a steel coin (c) a copper wire (d) an iron nail
11. 11.📏 How many kilo-ohms (kΩ) is 3100 Ω? =
12. 12.Which of these is safe? (a) poke things in a socket (b) fly a kite near wires (c) use small battery cells (d) throw cells in a fire
13. 13.Which of these is a good habit? (a) accept every permission (b) ignore update messages (c) read app permissions (d) share the Wi-Fi key
14. 14.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) both lines (c) neither line (d) the longer line
15. 15.⚡ What does a ceiling fan mainly change electricity into? (a) sound (b) heat (c) movement (d) light
16. 16.Which job is done by the voltage regulator? (a) runs the program (b) restarts the program (c) keeps the voltage steady (d) brings power and code
17. 17.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 44 °C. What is shown? (a) Warm (b) Cool (c) Hot
19. 19.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
20. 20.🔍 Which is the odd one out? (a) a Wi-Fi weather station (b) a battery torch (c) a pencil sharpener (d) a wind-up clock
21. 21.🔍 Which is the odd one out? (a) a copper wire (b) a woollen thread (c) an iron nail (d) a safety pin
22. 22.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
23. 23.🌈 In the resistor colour code, which number does white stand for?
24. 24.What does the actuator do? (a) reads values, decides (b) acts on a command (c) measures the real world (d) stores data online
25. 25.True or false: to share only needed data is a good habit. (a) True (b) False
26. 26.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
27. 27.💡 5 identical bulbs are in parallel and each one takes 1 A. What total current (in amperes) comes from the battery? =
28. 28.🔺 A current of 1 A flows when 15 V is joined across a resistor. What is its resistance (in ohms)?
29. 29.🌐 A weather station sends one reading every 60 seconds. How many readings does it send in 10 minutes?
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) dimmer (b) brighter (c) the same
31. 31.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a sensor (d) a program
32. 32.📏 Which unit measures voltage? (a) ampere (A) (b) volt (V) (c) ohm (Ω) (d) watt (W)
33. 33.🔋 Does a wind turbine give electricity or use electricity? (a) uses electricity (b) gives electricity
34. 34.🔍 Which is the odd one out? (a) a rubber band (b) a safety pin (c) a steel spoon (d) an iron nail
35. 35.⏱️ repeat 9 times { buzzer ON; wait 800 ms; buzzer OFF; wait 900 ms }
    How many milliseconds does this take in all?
36. 36.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
37. 37.True or false: if a wire has come loose, the circuit is closed and current flows. (a) False (b) True
38. 38.🧾 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
39. 39.🔁 x = 5
    repeat 2 times { x = x × 2 }
    What is x at the end?
40. 40.Which job needs a distance sensor? (a) stop a robot near walls (b) spot someone walking in (c) water a dry plant (d) keep an incubator warm

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