Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 508 · 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 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
2. 2.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) stays the same (c) becomes zero (d) gets smaller
3. 3.Which drawing is the symbol for an ammeter? (a) a circle with A inside (b) one tall, one short bar (c) two or more cell symbols (d) triangle, bar and arrows
4. 4.🧩 A capacitor in a circuit can … (a) spin a wheel (b) store charge briefly (c) measure heat (d) make light
5. 5.🔺 A current of 2.5 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
6. 6.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) quick and clear for all (c) to hide the circuit (d) symbols are heavier
7. 7.🔺 An 8.8 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
8. 8.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a rubber band across the gap. Does the bulb glow? (a) Yes (b) No
9. 9.⚡ What does a toaster mainly change electricity into? (a) light (b) sound (c) heat (d) movement
10. 10.True or false: on a cell, “the flat end” means the − (negative) end. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) stop if a part gets hot (b) fly kites in open fields (c) build with an adult near (d) climb an electric pole
12. 12.⚡ What do we call a flow of electric charge through a wire? (a) electric current (b) friction (c) a magnet (d) sound
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
14. 14.True or false: a push button flips up or down. (a) True (b) False
15. 15.True or false: to leave fridge door open saves electricity. (a) True (b) False
16. 16.🔺 A current of 0.5 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
17. 17.🔺 In the V-I-R triangle, how do we find R? (a) R = V × I (b) R = V ÷ I (c) R = I ÷ V (d) R = V + I
18. 18.True or false: the ammeter is joined in series. (a) True (b) False
19. 19.⚠️ Is it safe to use small battery cells? (a) safe (b) not safe
20. 20.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
21. 21.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) bulb (b) motor (c) resistor (d) cell
22. 22.🔺 In the V-I-R triangle, how do we find V? (a) V = I × R (b) V = R ÷ I (c) V = I + R (d) V = I ÷ R
23. 23.⚠️ About how many volts do home sockets in India supply? (a) 12 V (b) 1.5 V (c) 230 V (d) 9 V
24. 24.🌐 In an IoT system, which part acts on a command? (a) cloud server (b) actuator (c) sensor (d) microcontroller
25. 25.🔌 Most metals are good … (a) conductors (b) magnets only (c) insulators (d) batteries
26. 26.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 51000 Ω resistor? (a) brown-green-orange (b) green-brown-orange (c) green-brown-red (d) green-brown-yellow
27. 27.🔍 Which is the odd one out? (a) a Wi-Fi doorbell camera (b) a plain wall switch (c) a paper calendar (d) a battery torch
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.⏱️ A program says “wait 1750 ms”. How many seconds is that? =
30. 30.Which of these is the process? (a) an LED lights up (b) check if temp > 30 (c) a buzzer beeps (d) the fan starts
31. 31.Which of these is the output? (a) an LED lights up (b) count button presses (c) check if temp > 30 (d) compare with a limit
32. 32.True or false: a paper strip is an insulator. (a) False (b) True
33. 33.🔁 What does a variable do in a program? (a) joins two wires (b) measures light (c) blinks an LED (d) stores a value
34. 34.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a plug top (b) a long wire (c) a bulb (d) a fuse or MCB
35. 35.🔺 A current of 2.5 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
36. 36.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.💡 3 identical bulbs are joined in series with a 12 V battery (ideal wires). How many volts does each bulb get? =
38. 38.Which of these mainly gives out light? (a) a buzzer (b) an electric toy car (c) a night lamp (d) a siren
39. 39.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
40. 40.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a copper wire across the gap. Does the bulb glow? (a) Yes (b) No

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