Electronics Worksheet: Sensors and Actuators

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

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