Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 76 · 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 a light sensor? (a) spot someone walking in (b) measure classroom noise (c) switch on lamps at dusk (d) warn of a gas leak
2. 2.True or false: to keep an incubator warm, use a soil moisture sensor. (a) False (b) True
3. 3.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a distance sensor (c) a gas sensor (d) a light sensor
4. 4.Which job needs a display? (a) beep an alarm (b) spin a robot’s wheels (c) turn to an exact angle (d) show the temperature
5. 5.Which job needs a buzzer? (a) show the temperature (b) turn to an exact angle (c) beep an alarm (d) open a gate to 90°
6. 6.Which job needs a rain sensor? (a) warn of a gas leak (b) close a window in rain (c) stop a robot near walls (d) start a fan when hot
7. 7.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
8. 8.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) an LED (d) a display
9. 9.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) an LED (d) a buzzer
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) an output (d) a power source
11. 11.🔍 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?
12. 12.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a soil moisture sensor
13. 13.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
14. 14.🔍 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)?
15. 15.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
17. 17.Which job needs a sound sensor? (a) switch on with a clap (b) open blinds at sunrise (c) stop a robot near walls (d) make a parking alarm
18. 18.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
19. 19.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a light sensor (c) a soil moisture sensor (d) a temperature sensor
20. 20.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) move water to plants (d) turn to an exact angle
21. 21.Which job needs a temperature sensor? (a) close a window in rain (b) start a fan when hot (c) warn of a gas leak (d) make a parking alarm
22. 22.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
23. 23.Which job needs a motion sensor? (a) spot someone walking in (b) make a parking alarm (c) keep an incubator warm (d) switch on lamps at dusk
24. 24.🔍 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?
25. 25.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.Which job needs a motor? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
27. 27.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
28. 28.Which job needs a sound sensor? (a) spot someone walking in (b) start a fan when hot (c) open blinds at sunrise (d) measure classroom noise
29. 29.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
30. 30.🔍 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)?
31. 31.True or false: to warn of a gas leak, use a temperature sensor. (a) False (b) True
32. 32.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
33. 33.Which job needs a temperature sensor? (a) open blinds at sunrise (b) spot someone walking in (c) keep an incubator warm (d) switch on with a clap
34. 34.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
35. 35.True or false: to open blinds at sunrise, use a rain sensor. (a) False (b) True
36. 36.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
37. 37.Which job needs a pump? (a) move water to plants (b) show a status light (c) open a gate to 90° (d) spin a robot’s wheels
38. 38.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
39. 39.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) water a dry plant (d) stop a robot near walls
40. 40.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a pump (d) a motor

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