Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 15 · 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 turn to an exact angle? (a) an LED (b) a buzzer (c) a servo motor (d) a pump
2. 2.Which job needs a pump? (a) move water to plants (b) show the temperature (c) spin a robot’s wheels (d) turn to an exact angle
3. 3.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a buzzer (c) a display (d) a motor
4. 4.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a light sensor (c) a gas sensor (d) a sound sensor
5. 5.🔍 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?
6. 6.Which job needs an LED? (a) open a gate to 90° (b) move water to plants (c) spin a robot’s wheels (d) show a status light
7. 7.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
8. 8.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a motion sensor (c) a sound sensor (d) a distance sensor
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
10. 10.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a motion sensor (c) a gas sensor (d) a soil moisture sensor
11. 11.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) start a fan when hot (d) stop a robot near walls
12. 12.True or false: to warn of a gas leak, use a motion sensor. (a) False (b) True
13. 13.Which job needs a rain sensor? (a) close a window in rain (b) measure classroom noise (c) switch on lamps at dusk (d) make a parking alarm
14. 14.Which job needs a buzzer? (a) open a gate to 90° (b) beep an alarm (c) move water to plants (d) show a status light
15. 15.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
16. 16.🔍 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?
17. 17.True or false: to water a dry plant, use a rain sensor. (a) True (b) False
18. 18.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
19. 19.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.True or false: to start a fan when hot, use a motion sensor. (a) False (b) True
21. 21.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a light sensor (c) a rain sensor (d) a sound sensor
22. 22.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a sound sensor (c) a distance sensor (d) a gas sensor
23. 23.Which job needs a gas sensor? (a) warn of a gas leak (b) spot someone walking in (c) close a window in rain (d) stop a robot near walls
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
26. 26.Which job needs a temperature sensor? (a) keep an incubator warm (b) warn of a gas leak (c) water a dry plant (d) stop a robot near walls
27. 27.True or false: to switch on lamps at dusk, use a gas sensor. (a) False (b) True
28. 28.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
29. 29.🔍 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?
30. 30.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a motion sensor
31. 31.True or false: to water a dry plant, use a gas sensor. (a) False (b) True
32. 32.True or false: to make a parking alarm, use a temperature sensor. (a) True (b) False
33. 33.Which job needs a servo motor? (a) turn to an exact angle (b) show the temperature (c) move water to plants (d) show a status light
34. 34.🔍 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)?
35. 35.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a motor (c) a display (d) a buzzer
36. 36.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
37. 37.True or false: to spot someone walking in, use a gas sensor. (a) True (b) False
38. 38.Which job needs a light sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) warn of a gas leak (d) make a parking alarm
39. 39.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) a display (d) a motor
40. 40.True or false: to close a window in rain, use a distance sensor. (a) True (b) False

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