Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 309 · 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) turn to an exact angle (b) beep an alarm (c) move water to plants (d) show a status light
2. 2.Which job needs a pump? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
3. 3.🔍 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?
4. 4.🔍 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)?
5. 5.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) close a window in rain (c) start a fan when hot (d) water a dry plant
6. 6.Which job needs a temperature sensor? (a) water a dry plant (b) make a parking alarm (c) start a fan when hot (d) switch on with a clap
7. 7.Which job needs a distance sensor? (a) keep an incubator warm (b) start a fan when hot (c) open blinds at sunrise (d) make a parking alarm
8. 8.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a light sensor (c) a rain sensor (d) a gas sensor
9. 9.Which job needs a light sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) start a fan when hot (d) switch on with a clap
10. 10.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
11. 11.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a motion sensor
12. 12.🔍 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?
13. 13.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a distance sensor (c) a soil moisture sensor (d) a temperature sensor
14. 14.Which job needs a rain sensor? (a) close a window in rain (b) water a dry plant (c) switch on with a clap (d) start a fan when hot
15. 15.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
16. 16.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) a display (d) a buzzer
17. 17.🔍 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?
18. 18.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
19. 19.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) an LED (d) a buzzer
20. 20.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
21. 21.🔍 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?
22. 22.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a temperature sensor (c) a gas sensor (d) a distance sensor
23. 23.🔍 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?
24. 24.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a buzzer (c) a servo motor (d) a motor
25. 25.Which job needs a motion sensor? (a) spot someone walking in (b) warn of a gas leak (c) make a parking alarm (d) start a fan when hot
26. 26.🔍 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?
27. 27.🔍 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)?
28. 28.Which job needs a distance sensor? (a) keep an incubator warm (b) stop a robot near walls (c) close a window in rain (d) measure classroom noise
29. 29.Which job needs a motor? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) move water to plants
30. 30.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a rain sensor (c) a motion sensor (d) a soil moisture sensor
31. 31.Which job needs a servo motor? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) move water to plants
32. 32.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
33. 33.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
34. 34.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a gas sensor (c) a soil moisture sensor (d) a temperature sensor
35. 35.Which job needs a servo motor? (a) show a status light (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants
36. 36.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
37. 37.Which job needs a display? (a) show the temperature (b) show a status light (c) beep an alarm (d) move water to plants
38. 38.🔍 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)?
39. 39.Which job needs a light sensor? (a) measure classroom noise (b) water a dry plant (c) open blinds at sunrise (d) stop a robot near walls
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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