Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 45 · 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 motion sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) water a dry plant (d) spot someone walking in
2. 2.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
3. 3.🔍 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?
4. 4.Which job needs a pump? (a) show a status light (b) open a gate to 90° (c) move water to plants (d) spin a robot’s wheels
5. 5.Which job needs a sound sensor? (a) water a dry plant (b) make a parking alarm (c) switch on with a clap (d) switch on lamps at dusk
6. 6.Which job needs a rain sensor? (a) spot someone walking in (b) start a fan when hot (c) close a window in rain (d) open blinds at sunrise
7. 7.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a light sensor (c) a rain sensor (d) a gas sensor
8. 8.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
9. 9.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a servo motor (c) an LED (d) a buzzer
10. 10.Which job needs a servo motor? (a) beep an alarm (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
12. 12.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
13. 13.🔍 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)?
14. 14.Which job needs a distance sensor? (a) switch on with a clap (b) warn of a gas leak (c) measure classroom noise (d) make a parking alarm
15. 15.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a display (c) a pump (d) a buzzer
16. 16.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a gas sensor (c) a rain sensor (d) a sound sensor
17. 17.🔍 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)?
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) a pump (d) a display
19. 19.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
20. 20.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) show the temperature
21. 21.🔍 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)?
22. 22.Which job needs a buzzer? (a) beep an alarm (b) turn to an exact angle (c) show a status light (d) open a gate to 90°
23. 23.Which job needs a light sensor? (a) warn of a gas leak (b) switch on with a clap (c) switch on lamps at dusk (d) spot someone walking in
24. 24.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a rain sensor (c) a soil moisture sensor (d) a light sensor
25. 25.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
26. 26.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
27. 27.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
28. 28.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a pump (c) a motor (d) a buzzer
29. 29.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) False (b) True
30. 30.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) close a window in rain (c) start a fan when hot (d) spot someone walking in
31. 31.True or false: to switch on with a clap, use a motion sensor. (a) False (b) True
32. 32.Which job needs a display? (a) move water to plants (b) show a status light (c) turn to an exact angle (d) show the temperature
33. 33.True or false: to switch on lamps at dusk, use a temperature sensor. (a) False (b) True
34. 34.True or false: to keep an incubator warm, use a distance sensor. (a) False (b) True
35. 35.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a rain sensor
36. 36.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
37. 37.Which job needs a motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) show the temperature
38. 38.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
39. 39.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
40. 40.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a servo motor (c) a pump (d) a motor

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