Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 430 · 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 of these is measured in amperes (A)? (a) energy used each second (b) how much a part resists (c) current (d) voltage
2. 2.True or false: energy used each second is measured in ohms (Ω). (a) False (b) True
3. 3.🌈 In the resistor colour code, which number does black stand for?
4. 4.🔁 repeat 3 times { repeat 6 times { beep } }
   How many beeps are there?
5. 5.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
6. 6.Which of these is measured in ohms (Ω)? (a) the push of a cell (b) resistance (c) voltage (d) energy used each second
7. 7.Which of these means the circuit is open? (a) a wire has come loose (b) the switch is ON (c) all wires are joined (d) the loop is complete
8. 8.💡 A red LED (it uses 2 V) is joined with a 200 Ω resistor to a 6 V supply. What current flows (in mA)?
9. 9.🔁 What does “count = count + 1” do? (a) takes 1 away (b) sets count to 1 (c) adds 1 to count (d) prints 1
10. 10.🧩 Which component makes a beeping sound? (a) motor (b) capacitor (c) buzzer (d) transistor
11. 11.⏱️ loop forever { LED ON; wait 800 ms; LED OFF; wait 900 ms }
    How many milliseconds does one blink (ON + OFF) take?
12. 12.🔺 An 11 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
13. 13.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets smaller (b) gets bigger (c) stays the same (d) becomes zero
14. 14.True or false: “a motion sensor signal” is the input. (a) True (b) False
15. 15.⚡ What does an exhaust fan mainly change electricity into? (a) sound (b) light (c) heat (d) movement
16. 16.🔍 Which is the odd one out? (a) use small battery cells (b) stay away from pylons (c) take cells out after use (d) fly a kite near wires
17. 17.Which job needs a sound sensor? (a) water a dry plant (b) measure classroom noise (c) keep an incubator warm (d) stop a robot near walls
18. 18.🔢 To run one loop of a plant-watering program, which comes first: “read the soil sensor” or “switch the pump on/off”? (a) read the soil sensor (b) switch the pump on/off
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
21. 21.Which of these mainly gives out heat? (a) a toaster (b) an electric drill (c) an LED lamp (d) a mixer grinder
22. 22.🔐 Which is the strongest password for a home smart camera? (a) password (b) Tiger#Lamp42!Moon (c) 123456 (d) admin
23. 23.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
24. 24.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) True (b) False
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
26. 26.What does a slide switch do? (a) stays where you flip it (b) works only while pressed (c) slides side to side (d) flips up or down
27. 27.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = I ÷ V (c) R = V × I (d) R = V + I
28. 28.🔘 Which kind of switch closes when tipped over? (a) a reed switch (b) a tilt switch (c) a toggle switch (d) a push button
29. 29.🔍 Which is the odd one out? (a) an app-controlled bulb (b) a Wi-Fi smart plug (c) a wind-up clock (d) a smart energy meter
30. 30.🔁 x = 2
    repeat 2 times { x = x × 2 }
    What is x at the end?
31. 31.⏱️ loop forever { LED ON; wait 500 ms; LED OFF; wait 400 ms }
    How many milliseconds does one blink (ON + OFF) take?
32. 32.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) LED (b) ammeter (c) cell (d) resistor
34. 34.True or false: “the pump turns on” is the input. (a) True (b) False
35. 35.🤖 Does a candle usually have a microcontroller inside? (a) Yes (b) No
36. 36.🔐 Is it a good or a risky habit to set a strong password? (a) risky habit (b) good habit
37. 37.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
38. 38.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 430 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
39. 39.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is OFF, B is OFF and C is ON. Does the bulb glow? (a) No (b) Yes
40. 40.Which of these is not safe? (a) keep drinks far away (b) use mains for a project (c) fly kites in open fields (d) take cells out after use

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