Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 45 · 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.🔦 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) No (b) Yes
2. 2.🔦 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 steel spoon. Does the bulb glow? (a) Yes (b) No
3. 3.True or false: “a motion sensor signal” is the process. (a) False (b) True
4. 4.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) both parts (c) neither part (d) the if part
5. 5.True or false: on a cell, “the longer symbol line” means the + (positive) end. (a) False (b) True
6. 6.🧩 Which component blows if current is high? (a) LED (b) transistor (c) fuse (d) capacitor
7. 7.🧩 Which component beeps for an alarm? (a) LED (b) transistor (c) buzzer (d) potentiometer
8. 8.Which of these is measured in amperes (A)? (a) energy used each second (b) power (c) the flow of charge (d) how much a part resists
9. 9.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. Does the bulb glow? (a) Yes (b) No
10. 10.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) a break stops every bulb (c) own switch for each bulb (d) one bulb out, all go out
11. 11.🔍 Which is the odd one out? (a) aluminium foil (b) a plastic straw (c) a graphite rod (d) a brass key
12. 12.🔁 What must there be for a current to flow? (a) a complete loop (b) one loose end (c) a broken path (d) a plastic gap
13. 13.🔺 In the V-I-R triangle, how do we find I? (a) I = V + R (b) I = R ÷ V (c) I = V × R (d) I = V ÷ R
14. 14.🔍 Which is the odd one out? (a) log out of shared phones (b) read app permissions (c) keep factory passwords (d) install software updates
15. 15.🌐 In an IoT system, which part measures the real world? (a) microcontroller (b) sensor (c) phone app (d) Wi-Fi
16. 16.🧮 Resistors of 10 Ω, 47 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
17. 17.🤖 How does a new program get onto a microcontroller board? (a) sent by sound (b) drawn with a pen (c) uploaded over USB (d) typed on the chip
18. 18.Which drawing is the symbol for an LED? (a) triangle against a bar (b) a circle with a cross (c) triangle, bar and arrows (d) many long-short pairs
19. 19.🔁 What do we call a circuit with a break in it? (a) a series circuit (b) a full circuit (c) a closed circuit (d) an open circuit
20. 20.🌈 Which band is read first on a resistor? (a) any band (b) the one nearest an end (c) the widest gap (d) the gold band
21. 21.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 16 °C. What is shown? (a) Hot (b) Warm (c) Cool
22. 22.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I × R (c) V = I + R (d) V = I ÷ R
23. 23.True or false: a motor turns a fan or wheels. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) share camera links (b) change default passwords (c) install software updates (d) turn off unused gadgets
25. 25.🔌 Most metals are good … (a) batteries (b) insulators (c) magnets only (d) conductors
26. 26.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
27. 27.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a light sensor
28. 28.🧩 Which component makes things spin? (a) fuse (b) buzzer (c) motor (d) resistor
29. 29.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
30. 30.🔍 Which is the odd one out? (a) a push button (b) a buzzer (c) a light sensor (d) a turning knob
31. 31.💡 Why does an LED need a resistor in series? (a) to change its colour (b) to limit the current (c) to store charge (d) to make it brighter
32. 32.True or false: to install software updates is a good habit. (a) False (b) True
33. 33.🏠 Which is a smart-home example? (a) a candle in a jar (b) a hand fan (c) lights on from an app (d) a printed map
34. 34.⚠️ Which power source should children use for electronics projects? (a) an inverter socket (b) a small battery pack (c) a mains extension board (d) a wall socket
35. 35.⏱️ loop forever { LED ON; wait 100 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 9 seconds?
36. 36.🌈 A resistor has the colour bands brown, blue, red. What is its value in kilo-ohms (kΩ)? =
37. 37.🔐 Is it a good or a risky habit to keep factory passwords? (a) risky habit (b) good habit
38. 38.🔺 A current of 0.2 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
39. 39.True or false: a resistor makes things spin. (a) True (b) False
40. 40.True or false: to use LED lamps wastes electricity. (a) True (b) False

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