Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 17 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
2. 2.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) an LED (d) a buzzer
3. 3.Which job needs a rain sensor? (a) close a window in rain (b) start a fan when hot (c) water a dry plant (d) measure classroom noise
4. 4.Which job needs a display? (a) spin a robot’s wheels (b) move water to plants (c) turn to an exact angle (d) show the temperature
5. 5.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a motor (d) a buzzer
6. 6.Which job needs a sound sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) measure classroom noise (d) water a dry plant
7. 7.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
8. 8.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
9. 9.True or false: to stop a robot near walls, use a gas sensor. (a) False (b) True
10. 10.Which job needs a light sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) spot someone walking in (d) keep an incubator warm
11. 11.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a light sensor
12. 12.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a gas sensor (c) a temperature sensor (d) a sound sensor
13. 13.True or false: to switch on with a clap, use a temperature sensor. (a) True (b) False
14. 14.Which job needs a pump? (a) show a status light (b) move water to plants (c) spin a robot’s wheels (d) beep an alarm
15. 15.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a temperature sensor (c) a gas sensor (d) a distance sensor
16. 16.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a servo motor (c) a buzzer (d) a motor
17. 17.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a servo motor (c) an LED (d) a display
18. 18.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.Which job needs a motion sensor? (a) open blinds at sunrise (b) spot someone walking in (c) keep an incubator warm (d) measure classroom noise
20. 20.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a motion sensor
21. 21.Which job needs a temperature sensor? (a) warn of a gas leak (b) measure classroom noise (c) water a dry plant (d) keep an incubator warm
22. 22.🔍 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)?
23. 23.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
24. 24.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
25. 25.Which job needs a motor? (a) show the temperature (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
26. 26.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) switch on with a clap (c) spot someone walking in (d) water a dry plant
27. 27.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.Which job needs a gas sensor? (a) water a dry plant (b) keep an incubator warm (c) warn of a gas leak (d) start a fan when hot
29. 29.🔍 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)?
30. 30.Which job needs a distance sensor? (a) warn of a gas leak (b) water a dry plant (c) switch on with a clap (d) stop a robot near walls
31. 31.Which job needs a sound sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) start a fan when hot (d) switch on with a clap
32. 32.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a gas sensor
33. 33.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a motion sensor (c) a temperature sensor (d) a light sensor
34. 34.🔍 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?
35. 35.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a gas sensor
36. 36.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
37. 37.🔍 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)?
38. 38.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a gas sensor (d) a sound sensor
39. 39.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a display (c) a pump (d) an LED
40. 40.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a rain sensor

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