Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 697 · 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 battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
2. 2.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
3. 3.True or false: to throw cells in a fire is safe. (a) False (b) True
4. 4.⏱️ A program says “wait 2500 ms”. How many seconds is that? =
5. 5.💡 3 identical bulbs are joined in parallel across a 9 V battery (ideal wires). How many volts does each bulb get? =
6. 6.⚠️ Is it safe to use mains for a project? (a) safe (b) not safe
7. 7.🔍 Which is the odd one out? (a) a fitness band with app (b) a smart energy meter (c) a wind-up clock (d) a Wi-Fi weather station
8. 8.🔘 Which kind of switch works only while pressed? (a) a slide switch (b) a reed switch (c) a push button (d) a toggle switch
9. 9.⏱️ How many milliseconds is a wait of 4.9 seconds?
10. 10.🌈 A resistor has the colour bands violet, blue, red. What is its value in kilo-ohms (kΩ)? =
11. 11.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a sound sensor (c) a gas sensor (d) a light sensor
12. 12.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) True (b) False
13. 13.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
14. 14.🔍 Which is the odd one out? (a) a torch (b) a tube light (c) a night lamp (d) an exhaust fan
15. 15.🧩 A capacitor in a circuit can … (a) make light (b) store charge briefly (c) spin a wheel (d) measure heat
16. 16.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a sound sensor (c) a gas sensor (d) a distance sensor
18. 18.🌈 Which band is read first on a resistor? (a) the gold band (b) the widest gap (c) any band (d) the one nearest an end
19. 19.🧩 Which component stores a little charge? (a) resistor (b) LDR (c) potentiometer (d) capacitor
20. 20.🔋 Does a generator give electricity or use electricity? (a) gives electricity (b) uses electricity
21. 21.🧩 Which component senses how hot it is? (a) capacitor (b) transistor (c) thermistor (d) motor
22. 22.💡 A battery lights 4 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
23. 23.True or false: “a single current path” is true of a series circuit. (a) True (b) False
24. 24.🔘 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 ON and C is OFF. Does the bulb glow? (a) Yes (b) No
25. 25.True or false: triangle, bar and arrows is the symbol for a bulb. (a) False (b) True
26. 26.🧮 A 33 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)?
27. 27.Which job needs a temperature sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) keep an incubator warm (d) measure classroom noise
28. 28.Which of these is an insulator? (a) a metal paper clip (b) a safety pin (c) a woollen thread (d) a copper wire
29. 29.Which of these is an IoT device? (a) a paper calendar (b) a Wi-Fi doorbell camera (c) a battery torch (d) a plain wall switch
30. 30.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) only one (b) none (c) both of them (d) it does not matter
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
32. 32.⚡ What does a street light mainly change electricity into? (a) sound (b) movement (c) light (d) heat
33. 33.💡 4 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. All the bulbs are in place. How many bulbs glow?
34. 34.⚡ A solar panel changes which kind of energy into electricity? (a) light energy (b) chemical energy (c) wind energy (d) sound energy
35. 35.Which of these is a conductor? (a) a plastic ruler (b) a rubber band (c) an iron nail (d) a paper strip
36. 36.What does the sensor do? (a) measures the real world (b) carries the data (c) shows data to you (d) reads values, decides
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
39. 39.🔦 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 graphite rod. Does the bulb glow? (a) No (b) Yes
40. 40.🔘 What does a switch do in a circuit? (a) stores current (b) changes the voltage (c) opens or closes the loop (d) makes electricity

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