Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 166 · 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 buzzer? (a) beep an alarm (b) turn to an exact angle (c) move water to plants (d) show the temperature
2. 2.Which job needs a soil moisture sensor? (a) switch on with a clap (b) close a window in rain (c) water a dry plant (d) keep an incubator warm
3. 3.True or false: to spot someone walking in, use a rain sensor. (a) False (b) True
4. 4.Which job needs a motion sensor? (a) stop a robot near walls (b) switch on with a clap (c) spot someone walking in (d) warn of a gas leak
5. 5.🔍 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)?
6. 6.🔍 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?
7. 7.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a rain sensor (c) a soil moisture sensor (d) a distance sensor
9. 9.Which job needs a motor? (a) beep an alarm (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
10. 10.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a light sensor (c) a soil moisture sensor (d) a rain sensor
11. 11.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False
12. 12.🔍 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?
13. 13.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a motor (c) an LED (d) a display
14. 14.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a sensor (d) a program
15. 15.Which job needs a light sensor? (a) start a fan when hot (b) stop a robot near walls (c) open blinds at sunrise (d) water a dry plant
16. 16.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a pump (c) a display (d) a servo motor
17. 17.Which job needs a distance sensor? (a) open blinds at sunrise (b) close a window in rain (c) stop a robot near walls (d) warn of a gas leak
18. 18.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) open a gate to 90° (d) spin a robot’s wheels
19. 19.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
20. 20.Which job needs a distance sensor? (a) water a dry plant (b) switch on with a clap (c) make a parking alarm (d) start a fan when hot
21. 21.Which job needs a pump? (a) spin a robot’s wheels (b) move water to plants (c) beep an alarm (d) open a gate to 90°
22. 22.Which job needs a temperature sensor? (a) stop a robot near walls (b) close a window in rain (c) keep an incubator warm (d) spot someone walking in
23. 23.🔍 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)?
24. 24.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.True or false: to warn of a gas leak, use a rain sensor. (a) False (b) True
26. 26.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a light sensor (c) a rain sensor (d) a distance sensor
27. 27.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a rain sensor (c) a distance sensor (d) a temperature sensor
29. 29.🔍 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?
30. 30.Which job needs a temperature sensor? (a) start a fan when hot (b) water a dry plant (c) close a window in rain (d) open blinds at sunrise
31. 31.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) an LED (c) a motor (d) a pump
33. 33.Which job needs a rain sensor? (a) open blinds at sunrise (b) spot someone walking in (c) close a window in rain (d) measure classroom noise
34. 34.True or false: to water a dry plant, use a rain sensor. (a) True (b) False
35. 35.🔍 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)?
36. 36.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a sound sensor (c) a rain sensor (d) a soil moisture sensor
38. 38.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
39. 39.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) an LED (d) a pump
40. 40.Which job needs a display? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) beep an alarm

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