Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 300 · 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 servo motor? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) turn to an exact angle
2. 2.Which job needs a gas sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) switch on lamps at dusk (d) measure classroom noise
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
4. 4.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a sound sensor (c) a temperature sensor (d) a soil moisture sensor
5. 5.Which job needs a pump? (a) show the temperature (b) beep an alarm (c) move water to plants (d) open a gate to 90°
6. 6.True or false: to close a window in rain, use a motion sensor. (a) True (b) False
7. 7.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
8. 8.Which job needs a motion sensor? (a) switch on with a clap (b) keep an incubator warm (c) spot someone walking in (d) warn of a gas leak
9. 9.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) an LED (d) a pump
10. 10.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a display (c) a buzzer (d) a servo motor
11. 11.Which job needs a light sensor? (a) spot someone walking in (b) open blinds at sunrise (c) make a parking alarm (d) water a dry plant
12. 12.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
13. 13.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.Which job needs a rain sensor? (a) water a dry plant (b) spot someone walking in (c) switch on lamps at dusk (d) close a window in rain
15. 15.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a display (c) a buzzer (d) a motor
16. 16.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
17. 17.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
18. 18.⚙️ Which actuator would you use to show a status light? (a) a motor (b) an LED (c) a pump (d) a servo motor
19. 19.Which job needs a light sensor? (a) spot someone walking in (b) close a window in rain (c) start a fan when hot (d) switch on lamps at dusk
20. 20.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
21. 21.Which job needs a distance sensor? (a) stop a robot near walls (b) switch on with a clap (c) open blinds at sunrise (d) spot someone walking in
22. 22.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a motion sensor (c) a gas sensor (d) a sound sensor
23. 23.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) move water to plants (d) show a status light
24. 24.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a servo motor (c) a buzzer (d) a display
25. 25.🔍 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)?
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.Which job needs a temperature sensor? (a) start a fan when hot (b) water a dry plant (c) open blinds at sunrise (d) close a window in rain
28. 28.🔍 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)?
29. 29.🔍 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)?
30. 30.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
31. 31.Which job needs a buzzer? (a) beep an alarm (b) open a gate to 90° (c) spin a robot’s wheels (d) turn to an exact angle
32. 32.🔍 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?
33. 33.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor
34. 34.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a gas sensor (d) a soil moisture sensor
35. 35.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a distance sensor (c) a soil moisture sensor (d) a light sensor
36. 36.True or false: to switch on with a clap, use a motion sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a sound sensor (c) a motion sensor (d) a soil moisture sensor
38. 38.Which job needs a display? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) open a gate to 90°
39. 39.🔍 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)?
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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