Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 525 · 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 uses electricity? (a) a power station (b) a solar panel (c) a bicycle dynamo (d) a washing machine
2. 2.🧮 A 470 Ω resistor is joined in series with two equal 220 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
3. 3.⚡ Which tiny particles drift along a metal wire to carry the current? (a) photons (b) water drops (c) electrons (d) dust particles
4. 4.⚡ What does a tube light mainly change electricity into? (a) light (b) movement (c) sound (d) heat
5. 5.📏 Which unit measures resistance? (a) watt (W) (b) ampere (A) (c) volt (V) (d) ohm (Ω)
6. 6.Which of these is a conductor? (a) a rubber eraser (b) a glass marble (c) a paper strip (d) a steel spoon
7. 7.Which of these uses electricity? (a) a television (b) a wind turbine (c) a battery (d) a cell
8. 8.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
9. 9.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
10. 10.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
11. 11.🔘 Which kind of switch stays where you flip it? (a) a slide switch (b) a reed switch (c) a toggle switch (d) a tilt switch
12. 12.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False
13. 13.🌈 In the resistor colour code, which number does violet stand for?
14. 14.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is OFF, B is OFF, C is ON and D is OFF. Does the bulb glow? (a) Yes (b) No
15. 15.⏱️ loop forever { LED ON; wait 550 ms; LED OFF; wait 850 ms }
    How many milliseconds does one blink (ON + OFF) take?
16. 16.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the input (b) the output (c) the battery (d) the process
17. 17.What does a reed switch do? (a) closes near a magnet (b) slides side to side (c) works only while pressed (d) closes when tipped over
18. 18.🤖 Microcontroller or laptop: which one runs one small program? (a) microcontroller (b) laptop
19. 19.🗺️ Before building a project, what should you write down first? (a) the box colour (b) nothing at all (c) inputs and outputs (d) the final price
20. 20.🤖 “if (A AND B)” is true when … (a) only A is true (b) both A and B are true (c) only B is true (d) both are false
21. 21.📏 How many ohms (Ω) is 5.2 kΩ?
22. 22.⚠️ About how many volts do home sockets in India supply? (a) 9 V (b) 230 V (c) 12 V (d) 1.5 V
23. 23.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) an open circuit (b) a safe circuit (c) a short circuit (d) a parallel circuit
24. 24.🔦 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
25. 25.🔢 To get a sensor reading onto a phone, which is the LAST step? (a) the board reads it (b) the cloud stores it (c) the sensor measures (d) the app shows it
26. 26.Which of these means the circuit is closed? (a) a wire has come loose (b) the switch is OFF (c) the bulb is unscrewed (d) all wires are joined
27. 27.True or false: triangle, bar and arrows is the symbol for a cell. (a) False (b) True
28. 28.🧮 Resistors of 50 Ω, 22 Ω, 50 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
29. 29.💡 2 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 2 is taken out of its holder. How many bulbs glow?
30. 30.True or false: a tube light mainly gives out light. (a) True (b) False
31. 31.⚠️ Is it safe to open a phone charger? (a) safe (b) not safe
32. 32.True or false: if a wire is cut, the circuit is closed and current flows. (a) True (b) False
33. 33.🔋 6 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
34. 34.⚠️ Is it safe to climb an electric pole? (a) safe (b) not safe
35. 35.🔐 Is it a good or a risky habit to cover unused cameras? (a) good habit (b) risky habit
36. 36.🌈 A resistor has the colour bands red, green, orange. What is its value in kilo-ohms (kΩ)? =
37. 37.🔌 Which part of a screwdriver should an electrician hold? (a) the metal tip (b) the steel shaft (c) the bare end (d) the plastic handle
38. 38.Which of these is an insulator? (a) a steel spoon (b) a copper wire (c) a glass marble (d) a safety pin
39. 39.🌈 In the resistor colour code, which number does blue stand for?
40. 40.Which of these is true of a series circuit? (a) many paths for current (b) a break stops every bulb (c) one out, the rest glow (d) used in house wiring

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