Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 93 · 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 actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a buzzer (d) a display
2. 2.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a motion sensor (c) a temperature sensor (d) a sound sensor
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
4. 4.🔍 Which sensor would you use to water a dry plant? (a) a temperature sensor (b) a light sensor (c) a distance sensor (d) a soil moisture sensor
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.Which job needs a motion sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) spot someone walking in (d) measure classroom noise
7. 7.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a light sensor (c) a distance sensor (d) a soil moisture sensor
8. 8.Which job needs a servo motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) show a status light (d) show the temperature
9. 9.🔍 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)?
10. 10.🔍 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?
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.Which job needs a pump? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) move water to plants
13. 13.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
14. 14.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a servo motor (c) a pump (d) a motor
15. 15.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
16. 16.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) an LED (d) a servo motor
17. 17.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a gas sensor (c) a light sensor (d) a rain sensor
18. 18.True or false: to water a dry plant, use a light sensor. (a) False (b) True
19. 19.Which job needs a display? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) show a status light
20. 20.🔍 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?
21. 21.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.True or false: to keep an incubator warm, use a distance sensor. (a) False (b) True
23. 23.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a gas sensor (d) a temperature sensor
24. 24.Which job needs a temperature sensor? (a) start a fan when hot (b) open blinds at sunrise (c) switch on with a clap (d) stop a robot near walls
25. 25.True or false: to spot someone walking in, use a rain sensor. (a) True (b) False
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor
29. 29.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.Which job needs a buzzer? (a) show a status light (b) beep an alarm (c) show the temperature (d) spin a robot’s wheels
31. 31.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a servo motor (c) a buzzer (d) an LED
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a pump (c) a display (d) a buzzer
34. 34.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a rain sensor
35. 35.Which job needs a soil moisture sensor? (a) measure classroom noise (b) close a window in rain (c) switch on lamps at dusk (d) water a dry plant
36. 36.Which job needs a motor? (a) spin a robot’s wheels (b) show the temperature (c) open a gate to 90° (d) turn to an exact angle
37. 37.Which job needs a sound sensor? (a) spot someone walking in (b) start a fan when hot (c) switch on lamps at dusk (d) measure classroom noise
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a distance sensor (c) a motion sensor (d) a light sensor
39. 39.Which job needs a rain sensor? (a) start a fan when hot (b) make a parking alarm (c) switch on with a clap (d) close a window in rain
40. 40.True or false: to close a window in rain, use a rain sensor. (a) True (b) False

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