Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 51 · 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 sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
2. 2.🔍 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?
3. 3.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a soil moisture sensor (c) a rain sensor (d) a light sensor
4. 4.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a buzzer (c) an LED (d) a servo motor
5. 5.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a servo motor (c) a motor (d) an LED
6. 6.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
7. 7.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
8. 8.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
9. 9.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a motor (c) a display (d) an LED
10. 10.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) move water to plants
11. 11.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) open blinds at sunrise (d) stop a robot near walls
12. 12.Which job needs a sound sensor? (a) start a fan when hot (b) switch on with a clap (c) water a dry plant (d) make a parking alarm
13. 13.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a motion sensor (c) a temperature sensor (d) a sound sensor
14. 14.True or false: to switch on with a clap, use a distance sensor. (a) False (b) True
15. 15.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
16. 16.Which job needs a distance sensor? (a) stop a robot near walls (b) switch on with a clap (c) switch on lamps at dusk (d) water a dry plant
17. 17.Which job needs a light sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) start a fan when hot (d) stop a robot near walls
18. 18.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
19. 19.Which job needs a motion sensor? (a) spot someone walking in (b) keep an incubator warm (c) start a fan when hot (d) water a dry plant
20. 20.Which job needs a servo motor? (a) beep an alarm (b) show the temperature (c) open a gate to 90° (d) spin a robot’s wheels
21. 21.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a motor (c) a pump (d) a buzzer
22. 22.Which job needs a display? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) show the temperature
23. 23.Which job needs a rain sensor? (a) close a window in rain (b) switch on lamps at dusk (c) water a dry plant (d) keep an incubator warm
24. 24.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a soil moisture sensor (c) a light sensor (d) a gas sensor
25. 25.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a rain sensor (c) a motion sensor (d) a temperature sensor
26. 26.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
27. 27.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.Which job needs a pump? (a) show a status light (b) move water to plants (c) turn to an exact angle (d) show the temperature
29. 29.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a soil moisture sensor (c) a motion sensor (d) a light sensor
32. 32.Which job needs a temperature sensor? (a) close a window in rain (b) switch on lamps at dusk (c) water a dry plant (d) keep an incubator warm
33. 33.🔍 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)?
34. 34.True or false: to warn of a gas leak, use a soil moisture sensor. (a) True (b) False
35. 35.🔍 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?
36. 36.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) show a status light
37. 37.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a gas sensor (c) a light sensor (d) a sound sensor
38. 38.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a buzzer (c) a display (d) an LED

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