Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 131 · 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 an LED? (a) spin a robot’s wheels (b) show a status light (c) show the temperature (d) move water to plants
2. 2.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
3. 3.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
4. 4.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a sound sensor (c) a gas sensor (d) a temperature sensor
5. 5.Which job needs a buzzer? (a) beep an alarm (b) show the temperature (c) open a gate to 90° (d) turn to an exact angle
6. 6.🔍 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)?
7. 7.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a soil moisture sensor (c) a sound sensor (d) a temperature sensor
8. 8.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) an LED (d) a motor
9. 9.⚙️ Which actuator would you use to show a status light? (a) a display (b) a pump (c) a buzzer (d) an LED
10. 10.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
11. 11.Which job needs a servo motor? (a) spin a robot’s wheels (b) move water to plants (c) open a gate to 90° (d) beep an alarm
12. 12.True or false: to spot someone walking in, use a distance sensor. (a) True (b) False
13. 13.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a distance sensor
14. 14.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a buzzer (c) a display (d) a servo motor
15. 15.Which job needs a display? (a) turn to an exact angle (b) show a status light (c) show the temperature (d) beep an alarm
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) a fuse (d) an output
17. 17.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a motion sensor (c) a rain sensor (d) a gas sensor
18. 18.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a light sensor (c) a sound sensor (d) a motion sensor
19. 19.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) water a dry plant (c) switch on with a clap (d) spot someone walking in
20. 20.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) show the temperature (d) show a status light
21. 21.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a servo motor (c) a buzzer (d) an LED
22. 22.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a light sensor (c) a gas sensor (d) a distance sensor
25. 25.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a distance sensor
26. 26.🔍 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)?
27. 27.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
28. 28.True or false: to spot someone walking in, use a light sensor. (a) True (b) False
29. 29.🔍 An object is 68 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) turn to an exact angle (b) beep an alarm (c) show a status light (d) spin a robot’s wheels
31. 31.Which job needs a sound sensor? (a) water a dry plant (b) start a fan when hot (c) switch on with a clap (d) stop a robot near walls
32. 32.Which job needs a light sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) stop a robot near walls (d) water a dry plant
33. 33.Which job needs a motion sensor? (a) close a window in rain (b) keep an incubator warm (c) open blinds at sunrise (d) spot someone walking in
34. 34.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
35. 35.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
36. 36.Which job needs a gas sensor? (a) make a parking alarm (b) start a fan when hot (c) switch on with a clap (d) warn of a gas leak
37. 37.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
38. 38.🔍 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)?
39. 39.🔍 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)?
40. 40.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False

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