Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 528 · 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.🌐 How does a home IoT device usually send its data to the app? (a) by shouting (b) by post (c) over Wi-Fi (d) through a candle
2. 2.Which of these is an IoT device? (a) an app-controlled bulb (b) a plain wall switch (c) a plain table fan (d) a battery torch
3. 3.Which of these is a conductor? (a) a graphite rod (b) a woollen thread (c) a glass marble (d) a ceramic cup
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
5. 5.Which job is done by the voltage regulator? (a) connect sensors and LEDs (b) shows the board is on (c) brings power and code (d) keeps the voltage steady
6. 6.Which of these is the process? (a) a temperature reading (b) a button press (c) the pump turns on (d) compare with a limit
7. 7.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a buzzer (c) a pump (d) an LED
8. 8.True or false: to turn off unused gadgets is a risky habit. (a) False (b) True
9. 9.🔘 Which kind of switch slides side to side? (a) a push button (b) a slide switch (c) a tilt switch (d) a toggle switch
10. 10.Which of these is true of a series circuit? (a) a single current path (b) own switch for each bulb (c) one out, the rest glow (d) each gets the full volts
11. 11.🔌 Is a sound sensor an input or an output for a microcontroller? (a) output (b) input
12. 12.💡 An LED is joined to a 9 V battery through a 1000 Ω resistor; its long leg goes to the + side and its short leg to the − side. What happens? (a) lights up (b) may burn out (c) does not light
13. 13.⚠️ Is it safe to poke things in a socket? (a) safe (b) not safe
14. 14.🔗 Series or parallel circuit: “used in house wiring”? (a) parallel (b) series
15. 15.What does a tilt switch do? (a) closes when tipped over (b) closes near a magnet (c) stays where you flip it (d) springs back when let go
16. 16.🌈 Which band is read first on a resistor? (a) the one nearest an end (b) the widest gap (c) any band (d) the gold band
17. 17.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the length of a wire (d) the colour of light
18. 18.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open
19. 19.🔍 Which is the odd one out? (a) an exhaust fan (b) a table fan (c) an electric kettle (d) an electric drill
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
21. 21.Which of these means the circuit is open? (a) the loop is complete (b) the bulb is unscrewed (c) the switch is ON (d) all wires are joined
22. 22.📏 Which unit measures energy used each second? (a) watt (W) (b) volt (V) (c) ohm (Ω) (d) ampere (A)
23. 23.Which of these is safe? (a) use mains for a project (b) touch a fallen wire (c) open a phone charger (d) use small battery cells
24. 24.Which of these is a risky habit? (a) share only needed data (b) cover unused cameras (c) install software updates (d) reuse one password
25. 25.True or false: on an LED, the longer leg is the anode (+). (a) False (b) True
26. 26.Which of these means the circuit is closed? (a) a wire has come loose (b) a cell is taken out (c) the loop is complete (d) the bulb is unscrewed
27. 27.Which of these is safe? (a) touch a fallen wire (b) fly a kite near wires (c) use mains for a project (d) dry your hands first
28. 28.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) switch (b) LED (c) cell (d) motor
29. 29.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.⚠️ Is it safe to stop if a part gets hot? (a) safe (b) not safe
31. 31.🔍 Which is the odd one out? (a) ignore update messages (b) share camera links (c) keep factory passwords (d) set up with a parent
32. 32.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 36 °C. What is shown? (a) Warm (b) Hot (c) Cool
33. 33.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
34. 34.🌈 A resistor has the colour bands yellow, red, orange. What is its value in kilo-ohms (kΩ)? =
35. 35.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is ON, B is OFF and C is ON. Does the bulb glow? (a) Yes (b) No
36. 36.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
37. 37.💡 In a series circuit, how many paths does the current have? (a) none (b) two (c) one for each bulb (d) one
38. 38.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
40. 40.True or false: to stop if a part gets hot is safe. (a) False (b) True

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