Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 185 · 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.🔍 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?
2. 2.Which job needs a buzzer? (a) beep an alarm (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
3. 3.🔍 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?
4. 4.Which job needs a pump? (a) move water to plants (b) show the temperature (c) spin a robot’s wheels (d) turn to an exact angle
5. 5.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
6. 6.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a gas sensor (c) a temperature sensor (d) a sound sensor
7. 7.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
8. 8.Which job needs a servo motor? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) beep an alarm
9. 9.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
10. 10.🔍 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)?
11. 11.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.Which job needs a servo motor? (a) show the temperature (b) spin a robot’s wheels (c) open a gate to 90° (d) beep an alarm
14. 14.Which job needs a display? (a) turn to an exact angle (b) spin a robot’s wheels (c) open a gate to 90° (d) show the temperature
15. 15.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.True or false: to water a dry plant, use a temperature sensor. (a) True (b) False
18. 18.🔍 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?
19. 19.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
20. 20.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
21. 21.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.⚙️ Which actuator would you use to show a status light? (a) a display (b) an LED (c) a pump (d) a servo motor
23. 23.🔍 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?
24. 24.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
25. 25.True or false: to measure classroom noise, use a distance sensor. (a) True (b) False
26. 26.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
27. 27.Which job needs a rain sensor? (a) close a window in rain (b) switch on lamps at dusk (c) stop a robot near walls (d) make a parking alarm
28. 28.True or false: to spot someone walking in, use a rain sensor. (a) True (b) False
29. 29.Which job needs a soil moisture sensor? (a) water a dry plant (b) warn of a gas leak (c) stop a robot near walls (d) keep an incubator warm
30. 30.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.Which job needs a motor? (a) show the temperature (b) show a status light (c) spin a robot’s wheels (d) move water to plants
32. 32.Which job needs a light sensor? (a) keep an incubator warm (b) make a parking alarm (c) switch on lamps at dusk (d) switch on with a clap
33. 33.🔍 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)?
34. 34.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
35. 35.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a motor (c) an LED (d) a servo motor
36. 36.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
38. 38.🔍 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)?
39. 39.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) an LED (d) a buzzer
40. 40.Which job needs an LED? (a) show a status light (b) open a gate to 90° (c) beep an alarm (d) turn to an exact angle

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