Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 82 · 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.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
2. 2.Which job needs a soil moisture sensor? (a) water a dry plant (b) warn of a gas leak (c) start a fan when hot (d) make a parking alarm
3. 3.True or false: to stop a robot near walls, use a motion sensor. (a) True (b) False
4. 4.Which job needs a buzzer? (a) spin a robot’s wheels (b) turn to an exact angle (c) open a gate to 90° (d) beep an alarm
5. 5.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
6. 6.Which job needs a sound sensor? (a) spot someone walking in (b) switch on with a clap (c) stop a robot near walls (d) open blinds at sunrise
7. 7.Which job needs a sound sensor? (a) measure classroom noise (b) make a parking alarm (c) warn of a gas leak (d) start a fan when hot
8. 8.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
9. 9.🔍 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?
10. 10.Which job needs a distance sensor? (a) close a window in rain (b) start a fan when hot (c) spot someone walking in (d) make a parking alarm
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) an output (d) a fuse
12. 12.Which job needs a display? (a) move water to plants (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
13. 13.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.Which job needs a pump? (a) show the temperature (b) move water to plants (c) beep an alarm (d) spin a robot’s wheels
16. 16.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
17. 17.True or false: to spot someone walking in, use a distance sensor. (a) True (b) False
18. 18.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a gas sensor (c) a light sensor (d) a soil moisture sensor
19. 19.Which job needs a gas sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) water a dry plant (d) keep an incubator warm
20. 20.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a motion sensor (c) a rain sensor (d) a temperature sensor
21. 21.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a soil moisture sensor (c) a light sensor (d) a distance sensor
22. 22.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a sound sensor (c) a soil moisture sensor (d) a distance sensor
23. 23.🔍 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)?
24. 24.True or false: to spot someone walking in, use a gas sensor. (a) True (b) False
25. 25.🔍 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)?
26. 26.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) start a fan when hot (d) make a parking alarm
27. 27.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) a servo motor (d) a pump
29. 29.🔍 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)?
30. 30.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a sound sensor (c) a motion sensor (d) a light sensor
31. 31.Which job needs a light sensor? (a) close a window in rain (b) switch on lamps at dusk (c) warn of a gas leak (d) keep an incubator warm
32. 32.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a buzzer (c) an LED (d) a servo motor
33. 33.Which job needs a light sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) close a window in rain (d) keep an incubator warm
34. 34.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
35. 35.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a soil moisture sensor (c) a gas sensor (d) a distance sensor
36. 36.True or false: to keep an incubator warm, use a soil moisture sensor. (a) True (b) False
37. 37.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a display (c) a servo motor (d) a pump
38. 38.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) an LED (c) a display (d) a motor
39. 39.True or false: to stop a robot near walls, use a rain sensor. (a) True (b) False
40. 40.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True

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