Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 682 · 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.🔋 5 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
2. 2.True or false: “check if temp > 30” is the process. (a) False (b) True
3. 3.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
4. 4.🌐 A soil sensor sends a reading to an app every 30 minutes. How many readings arrive in 4 hours?
5. 5.🔌 Is a keypad an input or an output for a microcontroller? (a) output (b) input
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
7. 7.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
8. 8.🔺 A current of 3 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
9. 9.📏 In the water-pipe picture of a circuit, current is like … (a) the flow of water (b) the pipe colour (c) a narrow pipe (d) the water pressure
10. 10.Which of these uses electricity? (a) a generator (b) a refrigerator (c) a wind turbine (d) a battery
11. 11.Which of these is measured in watts (W)? (a) how much a part resists (b) voltage (c) the flow of charge (d) energy used each second
12. 12.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
13. 13.🌈 Which band is read first on a resistor? (a) the one nearest an end (b) the gold band (c) the widest gap (d) any band
14. 14.💡 3 identical bulbs are joined in series with a 7.5 V battery (ideal wires). How many volts does each bulb get? =
15. 15.True or false: “a tilt switch: on or off” is an analog signal. (a) True (b) False
16. 16.True or false: “a light level reading” is the input. (a) True (b) False
17. 17.True or false: if the switch is ON, the circuit is open and no current flows. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) set up with a parent (b) share only needed data (c) turn off unused gadgets (d) post your live location
19. 19.🔗 Series or parallel circuit: “one out, the rest glow”? (a) series (b) parallel
20. 20.✏️ In a circuit diagram, which part is drawn as a circle with a cross? (a) resistor (b) bulb (c) voltmeter (d) motor
21. 21.Which of these mainly gives out light? (a) a toaster (b) an LED lamp (c) an electric drill (d) an electric toy car
22. 22.Which of these is an output? (a) a temperature sensor (b) a push button (c) a servo motor (d) a motion sensor
23. 23.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) both lines (c) the longer line (d) neither line
24. 24.🔁 What do we call a circuit with a break in it? (a) a full circuit (b) an open circuit (c) a closed circuit (d) a series circuit
25. 25.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 700 ms }
    How many times does the LED blink in 3 seconds?
26. 26.Which of these means the circuit is open? (a) the switch is OFF (b) all wires are joined (c) the loop is complete (d) the switch is ON
27. 27.🔋 Does a washing machine give electricity or use electricity? (a) uses electricity (b) gives electricity
28. 28.Which of these is an insulator? (a) a brass key (b) aluminium foil (c) a ceramic cup (d) a steel spoon
29. 29.🧮 Three equal 30 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
30. 30.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) battery (b) cell (c) ammeter (d) bulb
31. 31.True or false: the voltmeter measures current. (a) True (b) False
32. 32.📶 Digital or analog: the room temperature? (a) analog (b) digital
33. 33.🌈 A resistor has the colour bands grey, blue, red. What is its value (in ohms)?
34. 34.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.True or false: “the pump turns on” is the process. (a) True (b) False
36. 36.True or false: a microcontroller runs many apps at once. (a) True (b) False
37. 37.🧮 Three equal 150 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
38. 38.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
39. 39.⚠️ Is it safe to keep drinks far away? (a) safe (b) not safe
40. 40.⚡ What does a room heater mainly change electricity into? (a) movement (b) light (c) sound (d) heat

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