Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 71 · 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 sensor would you use to spot someone walking in? (a) a light sensor (b) a temperature sensor (c) a motion sensor (d) a gas sensor
2. 2.Which job needs a sound sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) open blinds at sunrise (d) measure classroom noise
3. 3.Which job needs a distance sensor? (a) open blinds at sunrise (b) spot someone walking in (c) start a fan when hot (d) make a parking alarm
4. 4.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) an LED (d) a buzzer
6. 6.True or false: to open blinds at sunrise, use a motion sensor. (a) True (b) False
7. 7.Which job needs a motor? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) spin a robot’s wheels
8. 8.🔍 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)?
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
10. 10.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a buzzer (c) an LED (d) a motor
11. 11.Which job needs a sound sensor? (a) switch on with a clap (b) make a parking alarm (c) start a fan when hot (d) spot someone walking in
12. 12.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a distance sensor (c) a motion sensor (d) a temperature sensor
13. 13.Which job needs a motion sensor? (a) spot someone walking in (b) open blinds at sunrise (c) switch on lamps at dusk (d) keep an incubator warm
14. 14.Which job needs a servo motor? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm
15. 15.True or false: to water a dry plant, use a light sensor. (a) False (b) True
16. 16.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) keep an incubator warm (d) stop a robot near walls
17. 17.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a gas sensor
18. 18.True or false: to start a fan when hot, use a distance sensor. (a) False (b) True
19. 19.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a motion sensor
21. 21.Which job needs a pump? (a) move water to plants (b) show a status light (c) show the temperature (d) turn to an exact angle
22. 22.🔍 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)?
23. 23.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a motion sensor (c) a rain sensor (d) a distance sensor
25. 25.Which job needs a gas sensor? (a) measure classroom noise (b) open blinds at sunrise (c) make a parking alarm (d) warn of a gas leak
26. 26.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a display (c) a servo motor (d) a buzzer
27. 27.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
28. 28.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 16 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 gas sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
31. 31.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
32. 32.Which job needs a distance sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) switch on lamps at dusk (d) start a fan when hot
33. 33.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a buzzer (c) a pump (d) an LED
34. 34.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a temperature sensor (c) a soil moisture sensor (d) a rain sensor
36. 36.True or false: to switch on with a clap, use a distance sensor. (a) True (b) False
37. 37.Which job needs a display? (a) show the temperature (b) spin a robot’s wheels (c) turn to an exact angle (d) beep an alarm
38. 38.🔍 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)?
39. 39.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False
40. 40.True or false: to close a window in rain, use a rain sensor. (a) True (b) False

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