Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 176 · 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 0.25 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
2. 2.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
3. 3.🗺️ In an input → process → output plan, is “the pump turns on” the input, the process or the output? (a) input (b) process (c) output
4. 4.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
5. 5.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) in series (c) by Wi-Fi (d) in parallel
6. 6.🧩 Which component glows using little power? (a) capacitor (b) LED (c) fuse (d) resistor
7. 7.🤖 Microcontroller or laptop: which one has a built-in keyboard? (a) microcontroller (b) laptop
8. 8.True or false: a ceiling fan mainly makes movement. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) a servo motor (b) a turning knob (c) a motor (d) a speaker
10. 10.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they keep glowing (b) they explode (c) they all go out (d) they get dimmer
11. 11.🧩 Which component makes things spin? (a) motor (b) resistor (c) diode (d) LED
12. 12.What does a push button do? (a) closes when tipped over (b) slides side to side (c) stays where you flip it (d) works only while pressed
13. 13.🤖 Does a hand pump usually have a microcontroller inside? (a) No (b) Yes
14. 14.Which of these usually has a microcontroller inside? (a) a candle (b) a toy robot (c) a bicycle bell (d) a hand pump
15. 15.True or false: “count button presses” is the output. (a) True (b) False
16. 16.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
17. 17.True or false: a slide switch slides side to side. (a) False (b) True
18. 18.🔋 8 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
19. 19.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
20. 20.Which of these gives us electricity? (a) a water pump (b) an air conditioner (c) a solar panel (d) a washing machine
21. 21.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) spot someone walking in (d) stop a robot near walls
22. 22.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) No (b) Yes
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
24. 24.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a ceramic cup. Does the bulb glow? (a) Yes (b) No
25. 25.True or false: “count button presses” is the process. (a) False (b) True
26. 26.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a safe circuit (b) a parallel circuit (c) an open circuit (d) a short circuit
27. 27.Which of these is measured in amperes (A)? (a) resistance (b) current (c) voltage (d) how much a part resists
28. 28.🔘 Which kind of switch springs back when let go? (a) a slide switch (b) a tilt switch (c) a reed switch (d) a push button
29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
30. 30.True or false: “used in house wiring” is true of a series circuit. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) dry your hands first (b) use a cable with cuts (c) keep drinks far away (d) fly kites in open fields
32. 32.🔺 A current of 0.25 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
33. 33.What does a slide switch do? (a) closes near a magnet (b) springs back when let go (c) closes when tipped over (d) slides side to side
34. 34.🔺 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
35. 35.🌐 Is a battery torch an IoT device? (a) an IoT device (b) not an IoT device
36. 36.🔺 A current of 20 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
37. 37.⏱️ A program says “wait 3750 ms”. How many seconds is that? =
38. 38.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) it does not matter (b) both of them (c) only one (d) none
39. 39.🔗 Series or parallel circuit: “one out, the rest glow”? (a) series (b) parallel
40. 40.True or false: a circle with M inside is the symbol for a diode. (a) False (b) True

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