Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 737 · 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.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
2. 2.What does a push button do? (a) stays where you flip it (b) works only while pressed (c) slides side to side (d) flips up or down
3. 3.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) no voltage (c) the same voltage (d) a bigger voltage
4. 4.Which of these gives us electricity? (a) a mobile phone (b) a wind turbine (c) a water pump (d) a washing machine
5. 5.Which drawing is the symbol for a junction? (a) one tall, one short bar (b) a dot where wires meet (c) a plain rectangle (d) a circle with a cross
6. 6.💡 Why does an LED need a resistor in series? (a) to limit the current (b) to change its colour (c) to make it brighter (d) to store charge
7. 7.🔢 To get a sensor reading onto a phone, which is the LAST step? (a) the sensor measures (b) the app shows it (c) the cloud stores it (d) it is sent by Wi-Fi
8. 8.🔺 A current of 20 mA flows when 4 V is joined across a resistor. What is its resistance (in ohms)?
9. 9.🔺 A current of 1 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) iron one shirt at a time
11. 11.🔁 repeat 5 times { repeat 5 times { beep } }
    How many beeps are there?
12. 12.🔦 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) No (b) Yes
13. 13.True or false: the ammeter measures voltage. (a) True (b) False
14. 14.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
15. 15.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) switch (b) voltmeter (c) diode (d) motor
16. 16.🔌 A gap of dry air between two wires acts as … (a) an insulator (b) a cell (c) a switch that is ON (d) a conductor
17. 17.⚡ What does a tube light mainly change electricity into? (a) sound (b) movement (c) light (d) heat
18. 18.🔁 Is the circuit closed or open if a wire is cut? (a) closed (b) open
19. 19.🌐 Is a battery torch an IoT device? (a) an IoT device (b) not an IoT device
20. 20.💡 In a series circuit, how many paths does the current have? (a) none (b) one for each bulb (c) one (d) two
21. 21.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
22. 22.⏱️ loop forever { LED ON; wait 100 ms; LED OFF; wait 100 ms }
    How many times does the LED blink in 8 seconds?
23. 23.🔍 Which is the odd one out? (a) a button press (b) a light level reading (c) a temperature reading (d) count button presses
24. 24.⏱️ repeat 3 times { buzzer ON; wait 700 ms; buzzer OFF; wait 700 ms }
    How many milliseconds does this take in all?
25. 25.🌈 A resistor has the colour bands grey, orange, orange. What is its value (in ohms)?
26. 26.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 59. What happens? (a) red LED ON (b) green LED ON
27. 27.Which of these mainly makes sound? (a) a loudspeaker (b) a street light (c) a ceiling fan (d) a table fan
28. 28.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
29. 29.🤖 How does a new program get onto a microcontroller board? (a) uploaded over USB (b) sent by sound (c) drawn with a pen (d) typed on the chip
30. 30.🔍 Which is the odd one out? (a) a copper wire (b) a brass key (c) a rubber band (d) a steel coin
31. 31.🤖 “if (A AND B)” is true when … (a) only A is true (b) both A and B are true (c) both are false (d) only B is true
32. 32.🔺 A current of 0.5 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
33. 33.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) a wire has come loose (c) the switch is ON (d) a cell is taken out
34. 34.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark an 81 Ω resistor? (a) brown-grey-black (b) grey-brown-brown (c) grey-brown-black (d) white-brown-black
35. 35.📏 Voltmeter or ammeter: which one is joined across a part? (a) voltmeter (b) ammeter
36. 36.Which drawing is the symbol for a cell? (a) one tall, one short bar (b) triangle against a bar (c) a straight line (d) a circle with V inside
37. 37.True or false: a push button stays where you flip it. (a) False (b) True
38. 38.What does the sensor do? (a) carries the data (b) reads values, decides (c) measures the real world (d) acts on a command
39. 39.🧮 A 22 Ω resistor is joined in series with two equal 470 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
40. 40.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a sensor (d) a battery

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