Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 463 · 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.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) gets smaller (c) becomes zero (d) stays the same
2. 2.🔋 How many 1.5 V cells must be joined in series to give 10.5 V?
3. 3.True or false: power is measured in watts (W). (a) False (b) True
4. 4.🌈 A resistor has the colour bands grey, grey, orange. What is its value (in ohms)?
5. 5.True or false: the ammeter is joined across a part. (a) True (b) False
6. 6.⚠️ Is it safe to stop if a part gets hot? (a) safe (b) not safe
7. 7.⚠️ Is it safe to take cells out after use? (a) not safe (b) safe
8. 8.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) to make it colourful (c) to hide the circuit (d) quick and clear for all
9. 9.Which job needs a motor? (a) open a gate to 90° (b) turn to an exact angle (c) show a status light (d) spin a robot’s wheels
10. 10.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
11. 11.Which of these is measured in ohms (Ω)? (a) energy used each second (b) the flow of charge (c) how much a part resists (d) current
12. 12.🔦 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 rubber band. Does the bulb glow? (a) Yes (b) No
13. 13.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) movement energy (b) sound energy (c) chemical energy (d) light energy
14. 14.⚠️ Which power source should children use for electronics projects? (a) a small battery pack (b) a wall socket (c) an inverter socket (d) a mains extension board
15. 15.⚡ A cell changes stored chemical energy into which kind of energy? (a) electrical energy (b) sound energy (c) nuclear energy (d) wind energy
16. 16.✏️ In a circuit diagram, which part is drawn as many long-short pairs? (a) junction (b) LED (c) bulb (d) battery
17. 17.🔍 Which is the odd one out? (a) a keypad (b) a sound sensor (c) a small display (d) a motion sensor
18. 18.🔋 Does a bicycle dynamo give electricity or use electricity? (a) uses electricity (b) gives electricity
19. 19.🔌 Is a steel spoon a conductor or an insulator? (a) an insulator (b) a conductor
20. 20.🌈 In the resistor colour code, which number does red stand for?
21. 21.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 5 V (d) 230 V
22. 22.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) used in house wiring (c) a single current path (d) bulbs share the voltage
23. 23.True or false: to cover unused cameras is a good habit. (a) True (b) False
24. 24.⏱️ repeat 9 times { buzzer ON; wait 700 ms; buzzer OFF; wait 200 ms }
    How many milliseconds does this take in all?
25. 25.Which of these mainly gives out light? (a) a buzzer (b) a torch (c) an exhaust fan (d) a room heater
26. 26.💡 5 identical bulbs are joined in series with a 10 V battery (ideal wires). How many volts does each bulb get? =
27. 27.🔺 An 8.25 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
28. 28.What does a push button do? (a) closes near a magnet (b) stays where you flip it (c) springs back when let go (d) flips up or down
29. 29.Which of these is a good habit? (a) keep factory passwords (b) share camera links (c) post your live location (d) change default passwords
30. 30.True or false: a potentiometer is a resistance knob. (a) True (b) False
31. 31.🔺 A current of 10 mA flows when 1.5 V is joined across a resistor. What is its resistance (in ohms)?
32. 32.🔺 A current of 1.5 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
33. 33.🗺️ Before building a project, what should you write down first? (a) the final price (b) nothing at all (c) inputs and outputs (d) the box colour
34. 34.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
35. 35.🔺 A current of 50 mA flows when 15 V is joined across a resistor. What is its resistance (in ohms)?
36. 36.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
37. 37.Which of these means the circuit is closed? (a) the switch is OFF (b) all wires are joined (c) the bulb is unscrewed (d) a wire has come loose
38. 38.True or false: the voltmeter is joined in series. (a) True (b) False
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
40. 40.🔺 A current of 2.5 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =

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