Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 315 · 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.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
2. 2.Which job needs a display? (a) beep an alarm (b) open a gate to 90° (c) show the temperature (d) spin a robot’s wheels
3. 3.🔍 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)?
4. 4.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a sound sensor (c) a gas sensor (d) a motion sensor
7. 7.Which job needs a temperature sensor? (a) keep an incubator warm (b) measure classroom noise (c) switch on with a clap (d) spot someone walking in
8. 8.True or false: to stop a robot near walls, use a sound sensor. (a) False (b) True
9. 9.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a soil moisture sensor (c) a sound sensor (d) a rain sensor
10. 10.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a servo motor (c) an LED (d) a motor
11. 11.Which job needs a motion sensor? (a) switch on with a clap (b) warn of a gas leak (c) spot someone walking in (d) keep an incubator warm
12. 12.🔍 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?
13. 13.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False
14. 14.Which job needs a motor? (a) show a status light (b) turn to an exact angle (c) beep an alarm (d) spin a robot’s wheels
15. 15.Which job needs a temperature sensor? (a) water a dry plant (b) start a fan when hot (c) close a window in rain (d) stop a robot near walls
16. 16.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) an LED (c) a display (d) a motor
17. 17.Which job needs an LED? (a) beep an alarm (b) open a gate to 90° (c) show the temperature (d) show a status light
18. 18.Which job needs a light sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) water a dry plant (d) keep an incubator warm
19. 19.🔍 Which sensor would you use to water a dry plant? (a) a rain sensor (b) a sound sensor (c) a light sensor (d) a soil moisture sensor
20. 20.Which job needs a distance sensor? (a) keep an incubator warm (b) measure classroom noise (c) open blinds at sunrise (d) stop a robot near walls
21. 21.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a soil moisture sensor (c) a temperature sensor (d) a gas sensor
22. 22.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
23. 23.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a gas sensor (d) a temperature sensor
24. 24.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
25. 25.🔍 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?
26. 26.Which job needs a gas sensor? (a) start a fan when hot (b) keep an incubator warm (c) warn of a gas leak (d) stop a robot near walls
27. 27.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a distance sensor (c) a temperature sensor (d) a rain sensor
28. 28.Which job needs a pump? (a) open a gate to 90° (b) move water to plants (c) turn to an exact angle (d) spin a robot’s wheels
29. 29.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
30. 30.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
31. 31.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
32. 32.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) a motor (d) an LED
33. 33.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a rain sensor (c) a gas sensor (d) a motion sensor
34. 34.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) water a dry plant (d) stop a robot near walls
35. 35.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
36. 36.🔍 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?
37. 37.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) an LED (d) a display
38. 38.Which job needs a sound sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) switch on with a clap (d) warn of a gas leak
39. 39.🔍 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?
40. 40.🔍 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?

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