Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 165 · 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 the temperature? (a) an LED (b) a display (c) a motor (d) a servo motor
2. 2.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a distance sensor (c) a rain sensor (d) a sound sensor
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a sound sensor (c) a temperature sensor (d) a gas sensor
4. 4.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
5. 5.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
6. 6.Which job needs a rain sensor? (a) measure classroom noise (b) close a window in rain (c) keep an incubator warm (d) switch on with a clap
7. 7.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a pump (c) an LED (d) a buzzer
8. 8.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.Which job needs a buzzer? (a) move water to plants (b) spin a robot’s wheels (c) beep an alarm (d) open a gate to 90°
10. 10.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a distance sensor (c) a gas sensor (d) a motion sensor
11. 11.Which job needs a light sensor? (a) open blinds at sunrise (b) switch on with a clap (c) water a dry plant (d) make a parking alarm
12. 12.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a display (c) a servo motor (d) a pump
13. 13.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) a fuse (d) an output
14. 14.Which job needs a sound sensor? (a) warn of a gas leak (b) spot someone walking in (c) make a parking alarm (d) switch on with a clap
15. 15.True or false: to measure classroom noise, use a gas sensor. (a) True (b) False
16. 16.Which job needs an LED? (a) move water to plants (b) beep an alarm (c) open a gate to 90° (d) show a status light
17. 17.🔍 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)?
18. 18.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a buzzer (c) a servo motor (d) a motor
19. 19.True or false: to warn of a gas leak, use a motion sensor. (a) True (b) False
20. 20.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a servo motor (c) a motor (d) a display
21. 21.Which job needs a motor? (a) show a status light (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
22. 22.True or false: to warn of a gas leak, use a soil moisture sensor. (a) False (b) True
23. 23.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
24. 24.🔍 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)?
25. 25.Which job needs a temperature sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) measure classroom noise (d) open blinds at sunrise
26. 26.🔍 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)?
27. 27.Which job needs a gas sensor? (a) make a parking alarm (b) switch on with a clap (c) warn of a gas leak (d) water a dry plant
28. 28.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a gas sensor
29. 29.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
30. 30.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a motion sensor (c) a distance sensor (d) a sound sensor
31. 31.Which job needs a distance sensor? (a) water a dry plant (b) stop a robot near walls (c) spot someone walking in (d) switch on with a clap
32. 32.Which job needs a servo motor? (a) show a status light (b) move water to plants (c) turn to an exact angle (d) show the temperature
33. 33.Which job needs a sound sensor? (a) make a parking alarm (b) measure classroom noise (c) warn of a gas leak (d) switch on lamps at dusk
34. 34.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a motion sensor
35. 35.Which job needs a motion sensor? (a) open blinds at sunrise (b) make a parking alarm (c) warn of a gas leak (d) spot someone walking in
36. 36.🔍 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)?
37. 37.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
38. 38.Which job needs a display? (a) show the temperature (b) beep an alarm (c) show a status light (d) move water to plants
39. 39.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a gas sensor (c) a rain sensor (d) a distance sensor
40. 40.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False

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