Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 346 · 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 stop a robot near walls? (a) a distance sensor (b) a rain sensor (c) a light sensor (d) a motion sensor
2. 2.Which job needs a display? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) beep an alarm
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a light sensor (c) a motion sensor (d) a temperature sensor
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
5. 5.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
6. 6.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a distance sensor (c) a soil moisture sensor (d) a gas sensor
7. 7.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) a motor (d) a buzzer
8. 8.Which job needs a distance sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) close a window in rain (d) stop a robot near walls
9. 9.Which job needs a motion sensor? (a) measure classroom noise (b) spot someone walking in (c) keep an incubator warm (d) switch on lamps at dusk
10. 10.Which job needs a buzzer? (a) show the temperature (b) show a status light (c) turn to an exact angle (d) beep an alarm
11. 11.🔍 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)?
12. 12.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
13. 13.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) an LED (c) a pump (d) a servo motor
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
16. 16.Which job needs a rain sensor? (a) close a window in rain (b) switch on lamps at dusk (c) switch on with a clap (d) warn of a gas leak
17. 17.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) an LED (d) a servo motor
19. 19.🔍 An object is 136 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 keep an incubator warm? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a sound sensor
21. 21.Which job needs a temperature sensor? (a) water a dry plant (b) measure classroom noise (c) start a fan when hot (d) make a parking alarm
22. 22.Which job needs a sound sensor? (a) switch on with a clap (b) start a fan when hot (c) make a parking alarm (d) spot someone walking in
23. 23.Which job needs a pump? (a) turn to an exact angle (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants
24. 24.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a light sensor (c) a motion sensor (d) a gas sensor
25. 25.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a temperature sensor (c) a sound sensor (d) a soil moisture sensor
26. 26.🔍 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?
27. 27.Which job needs a gas sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) make a parking alarm (d) measure classroom noise
28. 28.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a display (c) a pump (d) a servo motor
29. 29.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a pump (c) a motor (d) a servo motor
30. 30.Which job needs a temperature sensor? (a) spot someone walking in (b) switch on with a clap (c) keep an incubator warm (d) stop a robot near walls
31. 31.Which job needs a sound sensor? (a) spot someone walking in (b) measure classroom noise (c) water a dry plant (d) warn of a gas leak
32. 32.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a motion sensor (c) a temperature sensor (d) a rain sensor
33. 33.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) turn to an exact angle (d) beep an alarm
34. 34.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a rain sensor (c) a temperature sensor (d) a distance sensor
36. 36.🔍 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)?
37. 37.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a light sensor (c) a distance sensor (d) a sound sensor
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
39. 39.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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