Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 294 · 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 motor? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) show a status light
2. 2.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a rain sensor (c) a temperature sensor (d) a gas sensor
4. 4.Which job needs a temperature sensor? (a) water a dry plant (b) keep an incubator warm (c) measure classroom noise (d) close a window in rain
5. 5.Which job needs a display? (a) move water to plants (b) beep an alarm (c) turn to an exact angle (d) show the temperature
6. 6.Which job needs a distance sensor? (a) spot someone walking in (b) keep an incubator warm (c) switch on with a clap (d) stop a robot near walls
7. 7.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a pump (c) a display (d) a buzzer
8. 8.🔍 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?
9. 9.Which job needs a distance sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) measure classroom noise (d) make a parking alarm
10. 10.Which job needs a gas sensor? (a) spot someone walking in (b) stop a robot near walls (c) warn of a gas leak (d) start a fan when hot
11. 11.Which job needs a motion sensor? (a) keep an incubator warm (b) measure classroom noise (c) spot someone walking in (d) start a fan when hot
12. 12.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
14. 14.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a sound sensor (c) a soil moisture sensor (d) a temperature sensor
15. 15.Which job needs an LED? (a) beep an alarm (b) show a status light (c) move water to plants (d) open a gate to 90°
16. 16.🔍 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?
17. 17.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
18. 18.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a pump (c) a display (d) a servo motor
19. 19.🔍 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)?
20. 20.Which job needs a pump? (a) show the temperature (b) show a status light (c) beep an alarm (d) move water to plants
21. 21.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) an LED (c) a pump (d) a servo motor
22. 22.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a distance sensor
23. 23.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
24. 24.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a pump (c) a buzzer (d) a display
25. 25.Which job needs a soil moisture sensor? (a) measure classroom noise (b) water a dry plant (c) spot someone walking in (d) start a fan when hot
26. 26.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a pump (c) an LED (d) a display
27. 27.🔍 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)?
28. 28.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
29. 29.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
30. 30.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
31. 31.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a pump (c) a servo motor (d) a motor
32. 32.Which job needs a rain sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) close a window in rain (d) spot someone walking in
33. 33.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
34. 34.🔍 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)?
35. 35.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
36. 36.Which job needs a light sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) start a fan when hot (d) measure classroom noise
37. 37.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a light sensor (c) a gas sensor (d) a distance sensor
38. 38.🔍 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)?
39. 39.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
40. 40.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a distance sensor (c) a motion sensor (d) a sound sensor

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