Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 292 · 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 actuator would you use to show a status light? (a) an LED (b) a display (c) a pump (d) a motor
2. 2.Which job needs a distance sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) spot someone walking in (d) switch on with a clap
3. 3.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a light sensor (c) a distance sensor (d) a rain sensor
4. 4.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor
5. 5.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
7. 7.Which job needs a gas sensor? (a) switch on with a clap (b) stop a robot near walls (c) keep an incubator warm (d) warn of a gas leak
8. 8.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) an LED (c) a pump (d) a buzzer
9. 9.🔍 Which sensor would you use to switch on with a clap? (a) a light sensor (b) a motion sensor (c) a rain sensor (d) a sound sensor
10. 10.Which job needs a servo motor? (a) beep an alarm (b) open a gate to 90° (c) move water to plants (d) spin a robot’s wheels
11. 11.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a display (c) an LED (d) a buzzer
12. 12.True or false: to start a fan when hot, use a sound sensor. (a) True (b) False
13. 13.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
14. 14.🔍 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)?
15. 15.Which job needs a temperature sensor? (a) warn of a gas leak (b) switch on with a clap (c) stop a robot near walls (d) keep an incubator warm
16. 16.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) True (b) False
17. 17.Which job needs a sound sensor? (a) measure classroom noise (b) warn of a gas leak (c) keep an incubator warm (d) start a fan when hot
18. 18.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
19. 19.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a pump (c) an LED (d) a servo motor
20. 20.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.Which job needs a motion sensor? (a) switch on with a clap (b) keep an incubator warm (c) start a fan when hot (d) spot someone walking in
22. 22.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a rain sensor (c) a soil moisture sensor (d) a distance sensor
23. 23.Which job needs a display? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) show a status light
24. 24.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False
25. 25.🔍 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)?
26. 26.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a distance sensor (c) a motion sensor (d) a temperature sensor
27. 27.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a buzzer (c) a motor (d) a display
28. 28.Which job needs a motor? (a) show a status light (b) spin a robot’s wheels (c) beep an alarm (d) move water to plants
29. 29.🔍 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?
30. 30.Which job needs a servo motor? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) show the temperature
31. 31.True or false: to keep an incubator warm, use a motion sensor. (a) True (b) False
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
34. 34.🔍 An object is 238 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 start a fan when hot? (a) a soil moisture sensor (b) a temperature sensor (c) a gas sensor (d) a rain sensor
36. 36.Which job needs a buzzer? (a) beep an alarm (b) move water to plants (c) show a status light (d) spin a robot’s wheels
37. 37.Which job needs a light sensor? (a) keep an incubator warm (b) measure classroom noise (c) switch on lamps at dusk (d) start a fan when hot
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a temperature sensor (c) a sound sensor (d) a soil moisture sensor
39. 39.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a display (d) a buzzer
40. 40.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True

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