Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 257 · 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 rain sensor. (a) False (b) True
2. 2.Which job needs an LED? (a) open a gate to 90° (b) move water to plants (c) beep an alarm (d) show a status light
3. 3.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
4. 4.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
5. 5.Which job needs a pump? (a) move water to plants (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
6. 6.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a soil moisture sensor (c) a rain sensor (d) a gas sensor
7. 7.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
8. 8.Which job needs a buzzer? (a) show a status light (b) turn to an exact angle (c) beep an alarm (d) move water to plants
9. 9.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
10. 10.Which job needs a temperature sensor? (a) make a parking alarm (b) stop a robot near walls (c) warn of a gas leak (d) keep an incubator warm
11. 11.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a motor (c) a buzzer (d) a servo motor
12. 12.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a motion sensor
13. 13.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
14. 14.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
15. 15.🔍 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)?
16. 16.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a display (c) a motor (d) a pump
17. 17.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) an output (d) a power source
18. 18.Which job needs a rain sensor? (a) stop a robot near walls (b) switch on with a clap (c) close a window in rain (d) keep an incubator warm
19. 19.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.Which job needs a distance sensor? (a) stop a robot near walls (b) start a fan when hot (c) spot someone walking in (d) close a window in rain
21. 21.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a sound sensor (c) a distance sensor (d) a rain sensor
22. 22.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) an LED (d) a pump
23. 23.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a servo motor (c) a display (d) a pump
24. 24.True or false: to make a parking alarm, use a sound sensor. (a) False (b) True
25. 25.Which job needs a light sensor? (a) spot someone walking in (b) make a parking alarm (c) open blinds at sunrise (d) measure classroom noise
26. 26.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True
27. 27.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a light sensor (c) a distance sensor (d) a gas sensor
28. 28.🔍 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)?
29. 29.True or false: to measure classroom noise, use a light sensor. (a) False (b) True
30. 30.Which job needs a temperature sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) close a window in rain (d) start a fan when hot
31. 31.True or false: to start a fan when hot, use a soil moisture sensor. (a) True (b) False
32. 32.Which job needs a servo motor? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) beep an alarm
33. 33.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a pump (c) a buzzer (d) a display
34. 34.🔍 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)?
35. 35.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
36. 36.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
39. 39.Which job needs a gas sensor? (a) measure classroom noise (b) close a window in rain (c) warn of a gas leak (d) water a dry plant
40. 40.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor

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