Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 42 · 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 display? (a) show the temperature (b) show a status light (c) beep an alarm (d) spin a robot’s wheels
2. 2.Which job needs a distance sensor? (a) open blinds at sunrise (b) close a window in rain (c) switch on with a clap (d) make a parking alarm
3. 3.Which job needs a servo motor? (a) show the temperature (b) spin a robot’s wheels (c) show a status light (d) open a gate to 90°
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
5. 5.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a rain sensor (c) a motion sensor (d) a temperature sensor
6. 6.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a buzzer (c) an LED (d) a motor
7. 7.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.Which job needs a pump? (a) turn to an exact angle (b) move water to plants (c) show a status light (d) beep an alarm
9. 9.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a soil moisture sensor (c) a sound sensor (d) a rain sensor
10. 10.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
11. 11.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a soil moisture sensor (c) a gas sensor (d) a rain sensor
12. 12.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🔍 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)?
14. 14.Which job needs a motion sensor? (a) switch on with a clap (b) spot someone walking in (c) make a parking alarm (d) stop a robot near walls
15. 15.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) an LED (c) a display (d) a servo motor
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.Which job needs an LED? (a) turn to an exact angle (b) open a gate to 90° (c) show a status light (d) spin a robot’s wheels
18. 18.Which job needs a rain sensor? (a) keep an incubator warm (b) close a window in rain (c) warn of a gas leak (d) stop a robot near walls
19. 19.Which job needs a servo motor? (a) show the temperature (b) beep an alarm (c) turn to an exact angle (d) spin a robot’s wheels
20. 20.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
21. 21.Which job needs a motor? (a) show the temperature (b) turn to an exact angle (c) beep an alarm (d) spin a robot’s wheels
22. 22.Which job needs a buzzer? (a) beep an alarm (b) show a status light (c) show the temperature (d) turn to an exact angle
23. 23.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
24. 24.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
26. 26.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a light sensor (c) a motion sensor (d) a sound sensor
27. 27.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
28. 28.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
29. 29.Which job needs a sound sensor? (a) make a parking alarm (b) water a dry plant (c) switch on with a clap (d) spot someone walking in
30. 30.Which job needs a soil moisture sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) open blinds at sunrise (d) water a dry plant
31. 31.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a gas sensor (c) a light sensor (d) a soil moisture sensor
32. 32.Which job needs a distance sensor? (a) keep an incubator warm (b) start a fan when hot (c) measure classroom noise (d) stop a robot near walls
33. 33.True or false: to spot someone walking in, use a gas sensor. (a) True (b) False
34. 34.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
37. 37.🔍 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?
38. 38.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
39. 39.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
40. 40.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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