Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 884 · 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.🔍 Which is the odd one out? (a) the fan starts (b) decide if soil is dry (c) an LED lights up (d) a buzzer beeps
2. 2.🔘 What does a switch do in a circuit? (a) makes electricity (b) changes the voltage (c) stores current (d) opens or closes the loop
3. 3.🧮 Resistors of 68 Ω, 10 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
4. 4.⚡ Power tells us … (a) the size of a cell (b) the colour of light (c) the length of a wire (d) energy used each second
5. 5.💡 What happens if an LED is put in backwards? (a) it lights brighter (b) it does not light (c) it changes colour (d) it makes a sound
6. 6.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) an open circuit (b) a parallel circuit (c) a safe circuit (d) a short circuit
7. 7.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) stop a robot near walls (c) measure classroom noise (d) start a fan when hot
8. 8.True or false: “the fan starts” is the input. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) a temperature sensor (b) an LED (c) a water pump (d) a buzzer
10. 10.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) a single current path (c) bulbs share the voltage (d) own switch for each bulb
11. 11.🔘 Which kind of switch closes near a magnet? (a) a reed switch (b) a toggle switch (c) a slide switch (d) a tilt switch
12. 12.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) the pump turns on (b) a light level reading (c) a temperature reading (d) a motion sensor signal
14. 14.🔺 A current of 0.5 A flows when 6 V is joined across a resistor. What is its resistance (in ohms)?
15. 15.🔌 Is a graphite rod a conductor or an insulator? (a) a conductor (b) an insulator
16. 16.True or false: a steel coin is a conductor. (a) False (b) True
17. 17.💡 In a series circuit, how many paths does the current have? (a) two (b) one (c) none (d) one for each bulb
18. 18.💡 2 identical bulbs are joined in series with a 3 V battery (ideal wires). How many volts does each bulb get? =
19. 19.⚡ Which formula gives electric power? (a) P = V + I (b) P = I ÷ V (c) P = V ÷ I (d) P = V × I
20. 20.💡 An LED is joined to a 5 V battery with no resistor; its long leg goes to the + side and its short leg to the − side. What happens? (a) does not light (b) lights up (c) may burn out
21. 21.⚠️ About how many volts do home sockets in India supply? (a) 230 V (b) 12 V (c) 1.5 V (d) 9 V
22. 22.🧮 Three equal 60 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
23. 23.⚡ What does a night lamp mainly change electricity into? (a) heat (b) movement (c) light (d) sound
24. 24.Which drawing is the symbol for a junction? (a) one tall, one short bar (b) triangle, bar and arrows (c) a dot where wires meet (d) two or more cell symbols
25. 25.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 200 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
26. 26.True or false: “a soil moisture reading” is the input. (a) True (b) False
27. 27.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) bigger (c) stay the same (d) zero
28. 28.True or false: on a cell, “the shorter symbol line” means the − (negative) end. (a) False (b) True
29. 29.💡 A battery lights 3 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
30. 30.💡 What does LED stand for? (a) low energy device (b) light-emitting diode (c) large electric dial (d) light energy dial
31. 31.What does a capacitor do? (a) glows using little power (b) is a resistance knob (c) smooths a wobbly supply (d) senses how hot it is
32. 32.🔋 6 identical 2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
33. 33.Which drawing is the symbol for a wire? (a) a circle with an X in it (b) many long-short pairs (c) a straight line (d) triangle, bar and arrows
34. 34.🌐 A soil sensor sends a reading to an app every 20 minutes. How many readings arrive in 6 hours?
35. 35.🔁 Is the circuit closed or open if a wire is cut? (a) closed (b) open
36. 36.💡 3 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. Bulb 1 is taken out of its holder. How many bulbs glow?
37. 37.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) in parallel (c) not joined (d) in series
38. 38.🔗 Series or parallel circuit: “used in house wiring”? (a) parallel (b) series
39. 39.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a ceramic cup. Does the bulb glow? (a) Yes (b) No
40. 40.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are OFF (b) only when both are ON (c) when either is ON (d) never

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