Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 347 · 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.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.Which job needs a motor? (a) open a gate to 90° (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
3. 3.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
4. 4.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a sound sensor
5. 5.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a gas sensor (c) a rain sensor (d) a distance sensor
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a pump (d) a buzzer
7. 7.Which job needs a buzzer? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
8. 8.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
9. 9.🔍 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)?
10. 10.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) turn to an exact angle (d) spin a robot’s wheels
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
12. 12.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a rain sensor (c) a gas sensor (d) a light sensor
13. 13.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor
15. 15.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
16. 16.Which job needs a servo motor? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) show the temperature
17. 17.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a pump (c) a servo motor (d) a motor
19. 19.Which job needs a temperature sensor? (a) switch on with a clap (b) measure classroom noise (c) open blinds at sunrise (d) keep an incubator warm
20. 20.Which job needs a distance sensor? (a) measure classroom noise (b) water a dry plant (c) make a parking alarm (d) switch on lamps at dusk
21. 21.🔍 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)?
22. 22.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.Which job needs a soil moisture sensor? (a) water a dry plant (b) measure classroom noise (c) spot someone walking in (d) switch on lamps at dusk
24. 24.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a motion sensor
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.True or false: to make a parking alarm, use a gas sensor. (a) False (b) True
29. 29.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) show the temperature
30. 30.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor
31. 31.Which job needs a rain sensor? (a) switch on with a clap (b) open blinds at sunrise (c) switch on lamps at dusk (d) close a window in rain
32. 32.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a buzzer (c) a motor (d) a servo motor
34. 34.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a rain sensor (c) a temperature sensor (d) a gas sensor
35. 35.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.Which job needs a light sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) warn of a gas leak (d) keep an incubator warm
37. 37.Which job needs a light sensor? (a) spot someone walking in (b) measure classroom noise (c) switch on with a clap (d) open blinds at sunrise
38. 38.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
39. 39.True or false: to switch on with a clap, use a soil moisture sensor. (a) True (b) False
40. 40.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a buzzer (c) a motor (d) a display

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