Electronics Worksheet: Sensors and Actuators

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

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