Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 770 · 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.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
2. 2.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 1000 (c) 10 (d) 100
3. 3.💡 In a series circuit, how many paths does the current have? (a) two (b) one for each bulb (c) one (d) none
4. 4.🔁 What does a variable do in a program? (a) measures light (b) stores a value (c) joins two wires (d) blinks an LED
5. 5.Which drawing is the symbol for a diode? (a) a circle with a cross (b) triangle against a bar (c) a dot where wires meet (d) one tall, one short bar
6. 6.🔢 To get a sensor reading onto a phone, what comes right after “the sensor measures”? (a) the app shows it (b) the cloud stores it (c) it is sent by Wi-Fi (d) the board reads it
7. 7.💡 A red LED (it uses 2 V) is joined with a 150 Ω resistor to a 5 V supply. What current flows (in mA)?
8. 8.🔐 Is it a good or a risky habit to share only needed data? (a) good habit (b) risky habit
9. 9.True or false: “a light level reading” is the output. (a) False (b) True
10. 10.What does a transistor do? (a) smooths a wobbly supply (b) senses how bright it is (c) stores a little charge (d) boosts a small signal
11. 11.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a steel spoon. Does the bulb glow? (a) No (b) Yes
12. 12.📏 How many watts (W) is 4.5 kW?
13. 13.🌐 In an IoT system, which part reads values, decides? (a) sensor (b) microcontroller (c) phone app (d) actuator
14. 14.🌐 Each reading a sensor sends is 50 bytes. How many bytes do 120 readings take?
15. 15.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.🧮 Resistors of 470 Ω, 470 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
17. 17.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
18. 18.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) parallel (b) series
19. 19.🔐 Is it a good or a risky habit to accept every permission? (a) risky habit (b) good habit
20. 20.🔐 Which is the strongest password for a home smart camera? (a) admin (b) Tiger#Lamp42!Moon (c) password (d) 123456
21. 21.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) switch (b) voltmeter (c) ammeter (d) cell
22. 22.📏 Which unit measures voltage? (a) watt (W) (b) ohm (Ω) (c) volt (V) (d) ampere (A)
23. 23.💡 2 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 1 glow? (a) No (b) Yes
24. 24.True or false: a plastic straw is a conductor. (a) True (b) False
25. 25.🗺️ Before building a project, what should you write down first? (a) the final price (b) the box colour (c) nothing at all (d) inputs and outputs
26. 26.Which of these is a good habit? (a) post your live location (b) keep factory passwords (c) change default passwords (d) ignore update messages
27. 27.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 1 glow? (a) No (b) Yes
28. 28.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are OFF (b) never (c) when either is ON (d) only when both are ON
29. 29.⚡ Which tiny particles drift along a metal wire to carry the current? (a) water drops (b) dust particles (c) electrons (d) photons
30. 30.🌐 What does IoT stand for? (a) Internet of Things (b) Internet of Talk (c) Inside of Toys (d) Input of Tools
31. 31.What does a push button do? (a) closes when tipped over (b) closes near a magnet (c) slides side to side (d) works only while pressed
32. 32.🔁 x = 4
    repeat 1 time { x = x × 2 }
    What is x at the end?
33. 33.Which of these is true of a series circuit? (a) each gets the full volts (b) own switch for each bulb (c) used in house wiring (d) bulbs share the voltage
34. 34.🔋 Identical cells side by side (in parallel) give … (a) double the voltage (b) half the voltage (c) no voltage (d) the same voltage
35. 35.📏 Which unit measures current? (a) volt (V) (b) watt (W) (c) ohm (Ω) (d) ampere (A)
36. 36.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) wavy lines (c) little stars (d) straight lines
37. 37.🔐 Is it a good or a risky habit to set up with a parent? (a) risky habit (b) good habit
38. 38.True or false: the flow of charge is measured in amperes (A). (a) False (b) True
39. 39.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) True (b) False
40. 40.True or false: “a button press” is the process. (a) True (b) False

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