Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 788 · 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 current of 50 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
2. 2.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
3. 3.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) resistor (b) bulb (c) switch (d) capacitor
4. 4.True or false: on an LED, the leg by the flat edge is the cathode (−). (a) False (b) True
5. 5.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
6. 6.True or false: if a wire is cut, the circuit is open and no current flows. (a) True (b) False
7. 7.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
8. 8.True or false: a brass key is a conductor. (a) False (b) True
9. 9.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 100 (c) 60 (d) 1000
10. 10.Which of these is measured in volts (V)? (a) resistance (b) the flow of charge (c) the push of a cell (d) energy used each second
11. 11.🔋 8 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
12. 12.Which of these usually has a microcontroller inside? (a) a wind-up toy (b) a candle (c) a bicycle bell (d) a microwave oven
13. 13.Which of these mainly makes movement? (a) an exhaust fan (b) a toaster (c) a traffic signal (d) a school bell
14. 14.🔺 A current of 1.5 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
15. 15.Which of these is an output? (a) a sound sensor (b) a servo motor (c) a keypad (d) a temperature sensor
16. 16.📏 How many watts (W) is 1.1 kW?
17. 17.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
18. 18.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
19. 19.Which of these is measured in volts (V)? (a) resistance (b) voltage (c) the flow of charge (d) how much a part resists
20. 20.True or false: a line lifted at a gap is the symbol for a switch. (a) False (b) True
21. 21.🔺 A current of 1.5 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
22. 22.⚡ What does a tube light mainly change electricity into? (a) light (b) heat (c) movement (d) sound
23. 23.🔍 Which is the odd one out? (a) count button presses (b) compare with a limit (c) an LED lights up (d) decide if soil is dry
24. 24.True or false: “many paths for current” is true of a series circuit. (a) False (b) True
25. 25.🔋 How many 2 V cells must be joined in series to give 16 V?
26. 26.🤖 Does a plain wall switch usually have a microcontroller inside? (a) Yes (b) No
27. 27.True or false: an electric drill mainly makes movement. (a) True (b) False
28. 28.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a graphite rod across the gap. Does the bulb glow? (a) No (b) Yes
29. 29.🌈 A resistor has the colour bands violet, red, red. What is its value in kilo-ohms (kΩ)? =
30. 30.🤖 Microcontroller or laptop: which one has a built-in keyboard? (a) laptop (b) microcontroller
31. 31.🧮 A 2.5 V battery is joined to 2 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
32. 32.🔁 total = 0
    for i = 1 to 9 { total = total + i }
    What is total at the end?
33. 33.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) show the temperature (d) open a gate to 90°
34. 34.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 4 glow? (a) Yes (b) No
35. 35.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
36. 36.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 12 cm. What happens? (a) buzzer beeps (b) buzzer is silent
37. 37.🔺 A current of 1 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
38. 38.🧩 Which component limits the current? (a) resistor (b) potentiometer (c) motor (d) buzzer
39. 39.🗺️ In an input → process → output plan, is “the pump turns on” the input, the process or the output? (a) input (b) output (c) process
40. 40.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) stays the same (c) gets smaller (d) becomes zero

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