Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 102 · 40 questions

Remember (Measure it, then move it): Match the sensor to the quantity: light, heat, distance, movement, soil wetness, sound, gas or rain. Match the actuator to the action: spin (motor), exact angle (servo), beep (buzzer), light (LED), water (pump), numbers (display). Echo distance = 17 × echo time in ms (cm), because the sound goes there and back.

1. 1.Which job needs a rain sensor? (a) keep an incubator warm (b) make a parking alarm (c) switch on with a clap (d) close a window in rain
2. 2.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) an LED (c) a servo motor (d) a buzzer
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a distance sensor (c) a rain sensor (d) a motion sensor
4. 4.Which job needs a light sensor? (a) start a fan when hot (b) stop a robot near walls (c) keep an incubator warm (d) open blinds at sunrise
5. 5.Which job needs a temperature sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) switch on lamps at dusk (d) measure classroom noise
6. 6.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
7. 7.Which job needs a temperature sensor? (a) stop a robot near walls (b) make a parking alarm (c) open blinds at sunrise (d) start a fan when hot
8. 8.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a buzzer (c) a display (d) a motor
9. 9.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
10. 10.True or false: to water a dry plant, use a gas sensor. (a) True (b) False
11. 11.Which job needs a gas sensor? (a) make a parking alarm (b) warn of a gas leak (c) close a window in rain (d) switch on with a clap
12. 12.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
13. 13.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
14. 14.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.True or false: to stop a robot near walls, use a gas sensor. (a) True (b) False
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.Which job needs an LED? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) open a gate to 90°
19. 19.True or false: to open blinds at sunrise, use a distance sensor. (a) False (b) True
20. 20.Which job needs a display? (a) spin a robot’s wheels (b) show a status light (c) show the temperature (d) turn to an exact angle
21. 21.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
22. 22.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a distance sensor (c) a sound sensor (d) a motion sensor
23. 23.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
24. 24.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a distance sensor (c) a motion sensor (d) a rain sensor
25. 25.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a motion sensor
26. 26.Which job needs a buzzer? (a) spin a robot’s wheels (b) move water to plants (c) beep an alarm (d) show the temperature
27. 27.Which job needs a soil moisture sensor? (a) spot someone walking in (b) water a dry plant (c) make a parking alarm (d) switch on lamps at dusk
28. 28.Which job needs a distance sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) make a parking alarm (d) close a window in rain
29. 29.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a servo motor (c) a motor (d) an LED
30. 30.Which job needs a pump? (a) turn to an exact angle (b) move water to plants (c) show a status light (d) spin a robot’s wheels
31. 31.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a display (c) a pump (d) a servo motor
33. 33.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
35. 35.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a buzzer (c) an LED (d) a motor
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.Which job needs a motion sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) warn of a gas leak (d) spot someone walking in
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
40. 40.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False

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