Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 553 · 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 is the odd one out? (a) a loudspeaker (b) a torch (c) a night lamp (d) a tube light
2. 2.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a woollen thread. Does the bulb glow? (a) Yes (b) No
3. 3.🔁 total = 0
   for i = 1 to 12 { total = total + i }
   What is total at the end?
4. 4.True or false: to stay away from pylons is not safe. (a) False (b) True
5. 5.True or false: many long-short pairs is the symbol for a battery. (a) False (b) True
6. 6.Which of these gives us electricity? (a) a refrigerator (b) a television (c) a generator (d) an air conditioner
7. 7.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
8. 8.🔘 A cell and a bulb are joined to 3 side-by-side paths with one switch on each path — A, B and C (parallel). A is ON, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
9. 9.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
10. 10.✏️ In a circuit diagram, which part is drawn as a straight line? (a) diode (b) battery (c) wire (d) voltmeter
11. 11.🔺 A 9 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
12. 12.🔢 To plan an electronics project, which is the FIRST step? (a) list inputs and outputs (b) pick a problem to solve (c) draw the circuit diagram (d) build it with an adult
13. 13.What does the phone app do? (a) measures the real world (b) reads values, decides (c) shows data to you (d) stores data online
14. 14.🔺 A current of 0.2 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
15. 15.True or false: to start a fan when hot, use a soil moisture sensor. (a) True (b) False
16. 16.True or false: a laptop runs one small program. (a) False (b) True
17. 17.What does a push button do? (a) closes when tipped over (b) stays where you flip it (c) works only while pressed (d) flips up or down
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
19. 19.Which of these is an output? (a) a keypad (b) a motion sensor (c) a buzzer (d) a sound sensor
20. 20.🔍 Which is the odd one out? (a) touch a switch when wet (b) build with an adult near (c) touch a fallen wire (d) use a cable with cuts
21. 21.🤖 if (sound > 70) { red LED ON } else { green LED ON }
    The sound sensor reads 57. What happens? (a) red LED ON (b) green LED ON
22. 22.🧩 Which component glows using little power? (a) diode (b) LED (c) thermistor (d) fuse
23. 23.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
24. 24.⚠️ Is it safe to throw cells in a fire? (a) safe (b) not safe
25. 25.Which of these is safe? (a) touch a switch when wet (b) use mains for a project (c) fly kites in open fields (d) use a cable with cuts
26. 26.📏 How many ohms (Ω) is 9.7 kΩ?
27. 27.💡 5 identical bulbs are joined in series with a 12.5 V battery (ideal wires). How many volts does each bulb get? =
28. 28.True or false: a circle with an X in it is the symbol for a bulb. (a) False (b) True
29. 29.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
30. 30.🔁 count = 3
    while (count < 33) { count = count + 5 }
    How many times does the loop run?
31. 31.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the input (b) the process (c) the battery (d) the output
32. 32.True or false: an LED is a resistance knob. (a) True (b) False
33. 33.💡 An LED is joined to a 6 V battery through a 470 Ω resistor; its long leg goes to the + side and its short leg to the − side. What happens? (a) lights up (b) does not light (c) may burn out
34. 34.True or false: if the loop is complete, the circuit is closed and current flows. (a) False (b) True
35. 35.True or false: “decide if soil is dry” is the output. (a) False (b) True
36. 36.🔌 Is a steel spoon a conductor or an insulator? (a) an insulator (b) a conductor
37. 37.🌈 A gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 0 % (c) 5 % (d) 25 %
38. 38.True or false: a steel spoon is a conductor. (a) True (b) False
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 woollen thread. Does the bulb glow? (a) No (b) Yes
40. 40.🤖 What is a microcontroller? (a) a kind of bulb (b) a type of battery (c) a computer on one chip (d) a big desktop computer

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