Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 935 · 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 resistors in parallel give a total that is … (a) more than either one (b) always zero (c) less than either one (d) their sum
2. 2.🏠 Which is a smart-home example? (a) a candle in a jar (b) a printed map (c) lights on from an app (d) a hand fan
3. 3.🌈 A resistor has the colour bands green, yellow, orange. What is its value in kilo-ohms (kΩ)? =
4. 4.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
6. 6.Which drawing is the symbol for a motor? (a) two equal parallel lines (b) a circle with an X in it (c) a circle with M inside (d) many long-short pairs
7. 7.🔢 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
8. 8.True or false: energy used each second is measured in watts (W). (a) True (b) False
9. 9.Which of these gives us electricity? (a) a washing machine (b) a bicycle dynamo (c) a refrigerator (d) a computer
10. 10.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 636. What happens? (a) lamp ON (b) lamp OFF
11. 11.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) battery (b) ammeter (c) bulb (d) voltmeter
12. 12.🔍 Which is the odd one out? (a) use mains for a project (b) dry your hands first (c) fly kites in open fields (d) build with an adult near
13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
14. 14.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) show a status light
15. 15.⚡ What does a tube light mainly change electricity into? (a) movement (b) sound (c) light (d) heat
16. 16.🌐 Is a battery torch an IoT device? (a) an IoT device (b) not an IoT device
17. 17.⚠️ Is it safe to fly a kite near wires? (a) safe (b) not safe
18. 18.🔌 Why are electric wires covered in plastic? (a) plastic is a conductor (b) plastic is an insulator (c) plastic makes current (d) to make them heavy
19. 19.🔁 count = 4
    repeat 6 times { count = count + 2 }
    What is count at the end?
20. 20.True or false: an LED makes things spin. (a) True (b) False
21. 21.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) a break stops every bulb (c) many paths for current (d) one bulb out, all go out
22. 22.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
23. 23.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a display (c) an LED (d) a servo motor
24. 24.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: a potentiometer glows using little power. (a) False (b) True
26. 26.Which of these is a good habit? (a) share camera links (b) set a strong password (c) accept every permission (d) keep factory passwords
27. 27.True or false: a microcontroller has a built-in keyboard. (a) True (b) False
28. 28.Which of these is measured in watts (W)? (a) the push of a cell (b) power (c) how much a part resists (d) current
29. 29.🔺 A current of 2 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
30. 30.Which of these is an output? (a) a light sensor (b) a sound sensor (c) a turning knob (d) a motor
31. 31.⚡ Power tells us … (a) the size of a cell (b) the length of a wire (c) energy used each second (d) the colour of light
32. 32.🧮 Four equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
33. 33.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 43 °C. What is shown? (a) Warm (b) Hot (c) Cool
34. 34.🌈 A resistor has the colour bands green, orange, orange. What is its value (in ohms)?
35. 35.🌈 A gold fourth band on a resistor means the value may be off by … (a) 5 % (b) 50 % (c) 0 % (d) 25 %
36. 36.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
37. 37.True or false: a slide switch springs back when let go. (a) True (b) False
38. 38.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 600 ms }
    How many milliseconds does one blink (ON + OFF) take?
39. 39.✏️ In a circuit diagram, which part is drawn as a straight line? (a) cell (b) wire (c) battery (d) junction
40. 40.📏 How many ohms (Ω) is 3.3 kΩ?

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