Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 231 · 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 wooden stick (b) a steel spoon (c) aluminium foil (d) a safety pin
2. 2.True or false: a dry cork is a conductor. (a) True (b) False
3. 3.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
4. 4.🔺 A 6 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
5. 5.🔺 A current of 2 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
6. 6.🌐 A weather station sends one reading every 15 seconds. How many readings does it send in 9 minutes?
7. 7.Which of these is true of a parallel circuit? (a) a single current path (b) bulbs share the voltage (c) one bulb out, all go out (d) each gets the full volts
8. 8.Which of these is measured in amperes (A)? (a) resistance (b) the push of a cell (c) energy used each second (d) the flow of charge
9. 9.🔋 A 12 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
10. 10.🔁 What does “count = count + 1” do? (a) adds 1 to count (b) prints 1 (c) sets count to 1 (d) takes 1 away
11. 11.🗺️ In an input → process → output plan, is “a button press” the input, the process or the output? (a) input (b) process (c) output
12. 12.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) not joined (c) in series (d) by Wi-Fi
13. 13.🔋 Does an air conditioner give electricity or use electricity? (a) gives electricity (b) uses electricity
14. 14.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) no voltage (c) half the voltage (d) double the voltage
15. 15.🌈 A resistor has the colour bands orange, green, red. What is its value in kilo-ohms (kΩ)? =
16. 16.🔌 Is a cotton thread a conductor or an insulator? (a) an insulator (b) a conductor
17. 17.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 16 cm. What happens? (a) buzzer beeps (b) buzzer is silent
18. 18.Which of these means the circuit is open? (a) the switch is OFF (b) all wires are joined (c) the switch is ON (d) the loop is complete
19. 19.True or false: “many paths for current” is true of a series circuit. (a) True (b) False
20. 20.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.🧮 Resistors of 100 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
22. 22.True or false: on an LED, the longer leg is the anode (+). (a) True (b) False
23. 23.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 1000 (c) 60 (d) 100
24. 24.True or false: many long-short pairs is the symbol for a battery. (a) False (b) True
25. 25.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
26. 26.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) the if part (c) neither part (d) both parts
27. 27.True or false: a potentiometer is a resistance knob. (a) False (b) True
28. 28.True or false: a digital thermometer usually has a microcontroller inside. (a) False (b) True
29. 29.🔺 A current of 10 mA flows when 4 V is joined across a resistor. What is its resistance (in ohms)?
30. 30.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
31. 31.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 43 Ω resistor? (a) yellow-orange-black (b) orange-yellow-black (c) green-orange-black (d) yellow-orange-brown
32. 32.Which drawing is the symbol for a bulb? (a) a circle with a cross (b) a circle with M inside (c) a circle with A inside (d) many long-short pairs
33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) unplug idle chargers (d) run fans in empty rooms
34. 34.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 50 % (c) 0 % (d) 5 %
35. 35.True or false: many long-short pairs is the symbol for a voltmeter. (a) False (b) True
36. 36.True or false: “a single current path” is true of a parallel circuit. (a) False (b) True
37. 37.True or false: two or more cell symbols is the symbol for a battery. (a) False (b) True
38. 38.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
39. 39.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
40. 40.Which of these is the input? (a) an alert on the phone (b) a light level reading (c) count button presses (d) an LED lights up

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