Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 50 · 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.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a bulb (b) a long wire (c) a plug top (d) a fuse or MCB
2. 2.⚡ Power tells us … (a) the length of a wire (b) the size of a cell (c) the colour of light (d) energy used each second
3. 3.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) straight lines (c) little stars (d) dotted circles
4. 4.⏱️ How many milliseconds is a wait of 5 seconds?
5. 5.Which of these is measured in amperes (A)? (a) power (b) resistance (c) the flow of charge (d) the push of a cell
6. 6.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) the longer line (c) neither line (d) the shorter line
7. 7.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
8. 8.📏 How many amperes (A) is 840 mA? =
9. 9.🔁 repeat 6 times { repeat 3 times { beep } }
   How many beeps are there?
10. 10.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
11. 11.🔍 Which is the odd one out? (a) touch a switch when wet (b) open a phone charger (c) stop if a part gets hot (d) poke things in a socket
12. 12.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
13. 13.🗺️ In an input → process → output plan, is “a soil moisture reading” the input, the process or the output? (a) process (b) output (c) input
14. 14.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True
15. 15.🔁 Is the circuit closed or open if a wire has come loose? (a) closed (b) open
16. 16.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 140 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
17. 17.🔁 total = 0
    for i = 1 to 6 { total = total + i }
    What is total at the end?
18. 18.Which of these is an input? (a) a push button (b) a buzzer (c) an LED (d) a motor
19. 19.🧮 A 20 Ω resistor is joined in series with two equal 100 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
20. 20.🔁 x = 1
    repeat 2 times { x = x × 2 }
    What is x at the end?
21. 21.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
22. 22.🧮 Two resistors in parallel give a total that is … (a) their sum (b) always zero (c) less than either one (d) more than either one
23. 23.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the battery (b) the output (c) the process (d) the input
24. 24.🌈 In the resistor colour code, which number does white stand for?
25. 25.⚠️ Is it safe to fly kites in open fields? (a) not safe (b) safe
26. 26.Which of these is true of a series circuit? (a) many paths for current (b) a break stops every bulb (c) own switch for each bulb (d) one out, the rest glow
27. 27.Which of these is an input? (a) a buzzer (b) a motor (c) a motion sensor (d) a water pump
28. 28.🤖 Which is a safe power source for a beginner microcontroller board? (a) bare mains wires (b) a 230 V cable (c) USB or a 9 V battery (d) a wall socket directly
29. 29.📏 How many milliamperes (mA) is 2.58 A?
30. 30.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
31. 31.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a motion sensor
32. 32.🔁 count = 3
    while (count < 9) { count = count + 2 }
    How many times does the loop run?
33. 33.🌈 Which band is read first on a resistor? (a) any band (b) the widest gap (c) the gold band (d) the one nearest an end
34. 34.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
35. 35.🧮 Five equal 250 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
36. 36.🤖 Does a microwave oven usually have a microcontroller inside? (a) Yes (b) No
37. 37.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = I ÷ V (c) P = V + I (d) P = V × I
38. 38.📏 How many ohms (Ω) is 3.6 kΩ?
39. 39.🔺 A 13.2 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
40. 40.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =

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