Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 701 · 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 of these is an insulator? (a) a safety pin (b) a dry cork (c) a copper wire (d) a metal paper clip
2. 2.🤖 “if (A AND B)” is true when … (a) only A is true (b) both are false (c) only B is true (d) both A and B are true
3. 3.📶 Digital or analog: how loud a sound is? (a) analog (b) digital
4. 4.True or false: on a cell, “the flat end” means the + (positive) end. (a) False (b) True
5. 5.🔺 In the V-I-R triangle, how do we find I? (a) I = V ÷ R (b) I = V + R (c) I = R ÷ V (d) I = V × R
6. 6.🔘 Two switches are in series. When does the bulb glow? (a) when both are ON (b) never (c) when both are OFF (d) when either is ON
7. 7.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = V × I (d) P = I ÷ V
8. 8.🔐 A smart speaker is always listening for its wake word. What is a sensible habit? (a) tell it your passwords (b) let strangers use it (c) mute it when not in use (d) put it in the bathroom
9. 9.🔺 A 3 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
10. 10.🔺 A current of 0.25 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
11. 11.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
12. 12.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
13. 13.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
14. 14.🔁 count = 7
    repeat 4 times { count = count + 8 }
    What is count at the end?
15. 15.🔍 Which is the odd one out? (a) a steel coin (b) a brass key (c) a woollen thread (d) a metal paper clip
16. 16.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a pump (c) a servo motor (d) an LED
17. 17.🌈 A resistor has the colour bands violet, white, black. What is its value (in ohms)?
18. 18.⚠️ Is it safe to use mains for a project? (a) safe (b) not safe
19. 19.🔍 Which is the odd one out? (a) a buzzer beeps (b) check if temp > 30 (c) the pump turns on (d) the fan starts
20. 20.⚠️ Is it safe to dry your hands first? (a) safe (b) not safe
21. 21.Which of these is not safe? (a) use small battery cells (b) keep drinks far away (c) stay away from pylons (d) use a cable with cuts
22. 22.⚠️ Why must we never touch switches with wet hands? (a) water makes it cold (b) it is just untidy (c) it spoils the paint (d) water carries current
23. 23.📏 Which unit measures the push of a cell? (a) watt (W) (b) ampere (A) (c) ohm (Ω) (d) volt (V)
24. 24.Which of these is an insulator? (a) aluminium foil (b) a ceramic cup (c) a steel coin (d) a copper wire
25. 25.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the battery (b) the output (c) the input (d) the process
26. 26.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown? (a) Warm (b) Hot (c) Cool
27. 27.🔘 Which kind of switch works only while pressed? (a) a toggle switch (b) a tilt switch (c) a push button (d) a slide switch
28. 28.🔐 Is it a good or a risky habit to post your live location? (a) risky habit (b) good habit
29. 29.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
30. 30.💡 2 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
31. 31.🔦 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
32. 32.🔁 x = 2
    repeat 5 times { x = x × 2 }
    What is x at the end?
33. 33.🔐 Is it a good or a risky habit to share only needed data? (a) good habit (b) risky habit
34. 34.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
35. 35.🤖 if (temperature > 30) { fan ON } else { fan OFF }
    The temperature sensor reads 35 °C. What happens? (a) fan ON (b) fan OFF
36. 36.💡 4 identical bulbs are joined in series with an 8 V battery (ideal wires). How many volts does each bulb get? =
37. 37.📏 How many ohms (Ω) is 6.8 kΩ?
38. 38.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) none (b) only one (c) it does not matter (d) both of them
39. 39.Which job is done by the power LED? (a) runs the program (b) connect sensors and LEDs (c) restarts the program (d) shows the board is on
40. 40.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) iron one shirt at a time

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