Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 156 · 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 soil moisture sensor? (a) switch on with a clap (b) water a dry plant (c) spot someone walking in (d) keep an incubator warm
2. 2.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a sensor (d) a battery
3. 3.Which job needs a motor? (a) spin a robot’s wheels (b) show the temperature (c) beep an alarm (d) turn to an exact angle
4. 4.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
5. 5.Which job needs a display? (a) show the temperature (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
6. 6.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
7. 7.Which job needs a rain sensor? (a) start a fan when hot (b) switch on with a clap (c) close a window in rain (d) water a dry plant
8. 8.Which job needs a pump? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
10. 10.True or false: to switch on with a clap, use a distance sensor. (a) True (b) False
11. 11.🔍 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?
12. 12.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
13. 13.Which job needs a gas sensor? (a) close a window in rain (b) measure classroom noise (c) stop a robot near walls (d) warn of a gas leak
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.True or false: to warn of a gas leak, use a temperature sensor. (a) False (b) True
16. 16.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
17. 17.🔍 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)?
18. 18.🔍 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?
19. 19.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a temperature sensor (c) a gas sensor (d) a soil moisture sensor
20. 20.🔍 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?
21. 21.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
22. 22.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
23. 23.Which job needs a temperature sensor? (a) spot someone walking in (b) water a dry plant (c) start a fan when hot (d) switch on with a clap
24. 24.Which job needs a sound sensor? (a) switch on with a clap (b) spot someone walking in (c) switch on lamps at dusk (d) open blinds at sunrise
25. 25.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
26. 26.Which job needs a buzzer? (a) beep an alarm (b) spin a robot’s wheels (c) open a gate to 90° (d) show the temperature
27. 27.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
28. 28.Which job needs a distance sensor? (a) start a fan when hot (b) switch on with a clap (c) stop a robot near walls (d) switch on lamps at dusk
29. 29.🔍 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)?
30. 30.Which job needs a temperature sensor? (a) make a parking alarm (b) water a dry plant (c) open blinds at sunrise (d) keep an incubator warm
31. 31.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
32. 32.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) an LED (c) a display (d) a servo motor
33. 33.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a servo motor (c) a buzzer (d) an LED
34. 34.🔍 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?
35. 35.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) an LED (c) a servo motor (d) a buzzer
36. 36.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) an LED (c) a motor (d) a pump
37. 37.Which job needs a light sensor? (a) make a parking alarm (b) start a fan when hot (c) open blinds at sunrise (d) close a window in rain
38. 38.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a distance sensor (c) a gas sensor (d) a motion sensor
39. 39.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
40. 40.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor

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