Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 316 · 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.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
2. 2.🔺 A current of 50 mA flows when 25 V is joined across a resistor. What is its resistance (in ohms)?
3. 3.Which of these uses electricity? (a) a generator (b) a washing machine (c) a power station (d) a bicycle dynamo
4. 4.Which of these mainly gives out light? (a) a torch (b) a room heater (c) an electric kettle (d) a buzzer
5. 5.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
6. 6.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) True (b) False
7. 7.🔗 Series or parallel circuit: “used in house wiring”? (a) series (b) parallel
8. 8.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) resistor (b) wire (c) cell (d) ammeter
9. 9.⏱️ How many milliseconds is a wait of 1.1 seconds?
10. 10.🔍 Which is the odd one out? (a) reuse one password (b) read app permissions (c) cover unused cameras (d) install software updates
11. 11.🔁 repeat 3 times { repeat 5 times { beep } }
    How many beeps are there?
12. 12.🔍 Which is the odd one out? (a) stop if a part gets hot (b) build with an adult near (c) open a phone charger (d) dry your hands first
13. 13.⏱️ What does “wait 500 ms” do? (a) pauses for half a second (b) waits 500 seconds (c) blinks 500 times (d) turns the LED off
14. 14.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 32 °C. What is shown? (a) Warm (b) Hot (c) Cool
15. 15.🌈 A resistor has the colour bands red, black, brown. What is its value (in ohms)?
16. 16.Which of these is a conductor? (a) an iron nail (b) a wooden stick (c) a paper strip (d) a plastic straw
17. 17.🔁 count = 4
    while (count < 44) { count = count + 5 }
    How many times does the loop run?
18. 18.🌐 Is a smart energy meter an IoT device? (a) an IoT device (b) not an IoT device
19. 19.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a dry cork. Does the bulb glow? (a) No (b) Yes
20. 20.True or false: a digital thermometer usually has a microcontroller inside. (a) True (b) False
21. 21.Which of these is an insulator? (a) a brass key (b) a copper wire (c) a woollen thread (d) aluminium foil
22. 22.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
23. 23.True or false: a potentiometer has coloured bands. (a) False (b) True
24. 24.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
25. 25.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
26. 26.🔺 In the V-I-R triangle, how do we find V? (a) V = I + R (b) V = R ÷ I (c) V = I × R (d) V = I ÷ R
27. 27.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 76. What happens? (a) green LED ON (b) red LED ON
28. 28.Which of these is not an IoT device? (a) an app-controlled bulb (b) a smart energy meter (c) a Wi-Fi weather station (d) a plain wall switch
29. 29.Which of these is an input? (a) a buzzer (b) a motor (c) a small display (d) a push button
30. 30.🔍 Which is the odd one out? (a) a graphite rod (b) a steel coin (c) a dry cork (d) a metal paper clip
31. 31.True or false: “HIGH or LOW only” is a digital signal. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
33. 33.🧮 A 1 V battery is joined to 2 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
34. 34.🔁 What does “count = count + 1” do? (a) takes 1 away (b) adds 1 to count (c) prints 1 (d) sets count to 1
35. 35.Which of these means the circuit is open? (a) the switch is ON (b) all wires are joined (c) the switch is OFF (d) the loop is complete
36. 36.Which of these is the input? (a) a temperature reading (b) an LED lights up (c) the pump turns on (d) decide if soil is dry
37. 37.🧮 Resistors of 50 Ω, 50 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
38. 38.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
39. 39.📏 How many kilo-ohms (kΩ) is 3400 Ω? =
40. 40.Which job needs a light sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) keep an incubator warm (d) close a window in rain

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