Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 72 · 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 sensor would you use to warn of a gas leak? (a) a rain sensor (b) a distance sensor (c) a temperature sensor (d) a gas sensor
2. 2.🔍 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)?
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a buzzer (c) a display (d) a servo motor
4. 4.True or false: to water a dry plant, use a gas sensor. (a) False (b) True
5. 5.Which job needs a sound sensor? (a) start a fan when hot (b) measure classroom noise (c) open blinds at sunrise (d) keep an incubator warm
6. 6.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a pump (c) a servo motor (d) an LED
7. 7.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a servo motor (c) a motor (d) a display
8. 8.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
9. 9.True or false: to switch on lamps at dusk, use a temperature sensor. (a) False (b) True
10. 10.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
11. 11.🔍 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?
12. 12.Which job needs a rain sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) start a fan when hot (d) close a window in rain
13. 13.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
14. 14.Which job needs a distance sensor? (a) stop a robot near walls (b) water a dry plant (c) switch on lamps at dusk (d) keep an incubator warm
15. 15.Which job needs a motor? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) show a status light
16. 16.Which job needs a soil moisture sensor? (a) switch on with a clap (b) water a dry plant (c) warn of a gas leak (d) stop a robot near walls
17. 17.Which job needs an LED? (a) move water to plants (b) open a gate to 90° (c) spin a robot’s wheels (d) show a status light
18. 18.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
19. 19.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
20. 20.True or false: to make a parking alarm, use a temperature sensor. (a) False (b) True
21. 21.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a gas sensor (c) a soil moisture sensor (d) a temperature sensor
22. 22.Which job needs a temperature sensor? (a) water a dry plant (b) keep an incubator warm (c) open blinds at sunrise (d) close a window in rain
23. 23.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a pump (c) a motor (d) a servo motor
24. 24.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a sound sensor (c) a rain sensor (d) a light sensor
26. 26.True or false: to close a window in rain, use a motion sensor. (a) False (b) True
27. 27.Which job needs a pump? (a) move water to plants (b) open a gate to 90° (c) beep an alarm (d) show a status light
28. 28.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
29. 29.🔍 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)?
30. 30.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a sound sensor (c) a distance sensor (d) a gas sensor
31. 31.Which job needs a light sensor? (a) keep an incubator warm (b) switch on with a clap (c) warn of a gas leak (d) switch on lamps at dusk
32. 32.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
33. 33.Which job needs a sound sensor? (a) open blinds at sunrise (b) close a window in rain (c) switch on with a clap (d) water a dry plant
34. 34.🔍 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?
35. 35.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a motion sensor
36. 36.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a display (c) a pump (d) a motor
37. 37.Which job needs a motion sensor? (a) make a parking alarm (b) warn of a gas leak (c) measure classroom noise (d) spot someone walking in
38. 38.🔍 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?
39. 39.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a pump (d) a display
40. 40.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a rain sensor (c) a motion sensor (d) a light sensor

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