Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 177 · 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.🔍 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)?
2. 2.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a motor (d) a servo motor
3. 3.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
4. 4.Which job needs an LED? (a) open a gate to 90° (b) turn to an exact angle (c) beep an alarm (d) show a status light
5. 5.Which job needs a rain sensor? (a) warn of a gas leak (b) make a parking alarm (c) start a fan when hot (d) close a window in rain
6. 6.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
7. 7.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
8. 8.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a sensor (d) a program
9. 9.Which job needs a light sensor? (a) close a window in rain (b) keep an incubator warm (c) measure classroom noise (d) switch on lamps at dusk
10. 10.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
11. 11.Which job needs a motor? (a) turn to an exact angle (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
12. 12.Which job needs a motion sensor? (a) make a parking alarm (b) stop a robot near walls (c) spot someone walking in (d) close a window in rain
13. 13.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) a display (d) a motor
15. 15.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a temperature sensor (c) a light sensor (d) a motion sensor
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
17. 17.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a servo motor (c) a display (d) a buzzer
18. 18.Which job needs a light sensor? (a) measure classroom noise (b) switch on with a clap (c) open blinds at sunrise (d) start a fan when hot
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a pump (c) a motor (d) an LED
20. 20.True or false: to switch on lamps at dusk, use a gas sensor. (a) False (b) True
21. 21.Which job needs a pump? (a) move water to plants (b) show the temperature (c) show a status light (d) beep an alarm
22. 22.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
23. 23.True or false: to close a window in rain, use a soil moisture sensor. (a) False (b) True
24. 24.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a servo motor (c) a display (d) an LED
25. 25.🔍 An object is 221 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) warn of a gas leak (b) switch on lamps at dusk (c) make a parking alarm (d) start a fan when hot
27. 27.Which job needs a servo motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) move water to plants (d) beep an alarm
28. 28.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) a display (d) a servo motor
29. 29.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a temperature sensor (c) a soil moisture sensor (d) a distance sensor
30. 30.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
31. 31.True or false: to warn of a gas leak, use a distance sensor. (a) False (b) True
32. 32.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a distance sensor (c) a soil moisture sensor (d) a sound sensor
33. 33.🔍 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?
34. 34.🔍 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)?
35. 35.🔍 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
36. 36.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a sound sensor (c) a distance sensor (d) a motion sensor
37. 37.🔍 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?
38. 38.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
39. 39.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) water a dry plant (c) warn of a gas leak (d) start a fan when hot
40. 40.Which job needs a temperature sensor? (a) measure classroom noise (b) stop a robot near walls (c) water a dry plant (d) keep an incubator warm

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