Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 830 · 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.True or false: a paper strip is an insulator. (a) False (b) True
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
3. 3.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a brass key. Does the bulb glow? (a) Yes (b) No
4. 4.⏱️ A program says “wait 7500 ms”. How many seconds is that? =
5. 5.🔍 Which is the odd one out? (a) a smart energy meter (b) a Wi-Fi smart plug (c) a plain table fan (d) an app-controlled bulb
6. 6.📏 Voltmeter or ammeter: which one measures voltage? (a) ammeter (b) voltmeter
7. 7.🔘 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 ON and C is OFF. Does the bulb glow? (a) No (b) Yes
8. 8.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 2 glow? (a) Yes (b) No
9. 9.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) No (b) Yes
10. 10.True or false: “the room temperature” is a digital signal. (a) False (b) True
11. 11.🔌 Is a rubber eraser a conductor or an insulator? (a) an insulator (b) a conductor
12. 12.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
13. 13.🌐 Is a wind-up clock an IoT device? (a) an IoT device (b) not an IoT device
14. 14.True or false: a digital alarm clock has no microcontroller inside. (a) False (b) True
15. 15.True or false: the ammeter is joined across a part. (a) True (b) False
16. 16.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a glass marble. Does the bulb glow? (a) Yes (b) No
17. 17.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
18. 18.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 24 °C. What is shown? (a) Warm (b) Cool (c) Hot
19. 19.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 210 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
20. 20.Which drawing is the symbol for a battery? (a) many long-short pairs (b) one tall, one short bar (c) a long and a short line (d) triangle, bar and arrows
21. 21.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
22. 22.🔍 Which is the odd one out? (a) compare with a limit (b) an alert on the phone (c) a buzzer beeps (d) an LED lights up
23. 23.🌈 Which band is read first on a resistor? (a) the widest gap (b) any band (c) the one nearest an end (d) the gold band
24. 24.🔢 To plan an electronics project, which is the FIRST step? (a) pick a problem to solve (b) list inputs and outputs (c) draw the circuit diagram (d) test it and fix it
25. 25.🔍 Which is the odd one out? (a) use mains for a project (b) build with an adult near (c) stop if a part gets hot (d) keep drinks far away
26. 26.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
27. 27.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
29. 29.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) pour water on them (b) wait and watch (c) shout for an adult (d) pull them by the hand
30. 30.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 5 is taken out of its holder. Does bulb 6 glow? (a) Yes (b) No
31. 31.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
32. 32.Which drawing is the symbol for an LED? (a) a circle with M inside (b) a dot where wires meet (c) triangle against a bar (d) triangle, bar and arrows
33. 33.True or false: to dry your hands first is safe. (a) True (b) False
34. 34.🧩 Which component makes things spin? (a) LED (b) resistor (c) capacitor (d) motor
35. 35.True or false: to warn of a gas leak, use a rain sensor. (a) False (b) True
36. 36.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) set a strong password (b) keep factory passwords (c) reuse one password (d) tap unknown app links
38. 38.🔺 A current of 2 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
39. 39.🔋 Identical cells side by side (in parallel) give … (a) half the voltage (b) no voltage (c) the same voltage (d) double the voltage
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) set the AC to 24 °C

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