Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 335 · 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 temperature sensor? (a) close a window in rain (b) spot someone walking in (c) switch on lamps at dusk (d) keep an incubator warm
2. 2.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🔍 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?
4. 4.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a gas sensor (c) a soil moisture sensor (d) a distance sensor
5. 5.Which job needs a soil moisture sensor? (a) water a dry plant (b) warn of a gas leak (c) measure classroom noise (d) start a fan when hot
6. 6.Which job needs a motion sensor? (a) warn of a gas leak (b) spot someone walking in (c) switch on with a clap (d) switch on lamps at dusk
7. 7.Which job needs a gas sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) warn of a gas leak (d) make a parking alarm
8. 8.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a buzzer (d) a pump
9. 9.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
10. 10.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
11. 11.🔍 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)?
12. 12.Which job needs a distance sensor? (a) start a fan when hot (b) water a dry plant (c) switch on with a clap (d) stop a robot near walls
13. 13.Which job needs a light sensor? (a) close a window in rain (b) stop a robot near walls (c) open blinds at sunrise (d) switch on with a clap
14. 14.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor
15. 15.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
16. 16.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
17. 17.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a motor (c) a display (d) an LED
18. 18.Which job needs a servo motor? (a) move water to plants (b) turn to an exact angle (c) beep an alarm (d) spin a robot’s wheels
19. 19.Which job needs a display? (a) show a status light (b) beep an alarm (c) show the temperature (d) spin a robot’s wheels
20. 20.Which job needs a sound sensor? (a) make a parking alarm (b) warn of a gas leak (c) measure classroom noise (d) stop a robot near walls
21. 21.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) an LED (c) a servo motor (d) a motor
22. 22.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a pump (c) a servo motor (d) a motor
23. 23.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a distance sensor (c) a rain sensor (d) a light sensor
24. 24.Which job needs a servo motor? (a) show the temperature (b) spin a robot’s wheels (c) beep an alarm (d) open a gate to 90°
25. 25.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a gas sensor (c) a distance sensor (d) a light sensor
26. 26.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
27. 27.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
28. 28.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a pump (d) a display
29. 29.True or false: to stop a robot near walls, use a rain sensor. (a) True (b) False
30. 30.Which job needs a pump? (a) open a gate to 90° (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
31. 31.Which job needs a distance sensor? (a) make a parking alarm (b) start a fan when hot (c) switch on lamps at dusk (d) close a window in rain
32. 32.True or false: to water a dry plant, use a light sensor. (a) True (b) False
33. 33.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) an LED (c) a servo motor (d) a motor
34. 34.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a motion sensor
35. 35.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a soil moisture sensor (c) a sound sensor (d) a temperature sensor
36. 36.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
37. 37.True or false: to spot someone walking in, use a light sensor. (a) False (b) True
38. 38.Which job needs a rain sensor? (a) start a fan when hot (b) close a window in rain (c) warn of a gas leak (d) keep an incubator warm
39. 39.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a temperature sensor (c) a motion sensor (d) a light sensor
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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