Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 289 · 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) water a dry plant (b) keep an incubator warm (c) make a parking alarm (d) spot someone walking in
2. 2.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
3. 3.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) warn of a gas leak (c) water a dry plant (d) open blinds at sunrise
5. 5.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a motor (c) a pump (d) an LED
6. 6.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a display (c) a servo motor (d) a buzzer
7. 7.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
9. 9.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a rain sensor
10. 10.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
11. 11.Which job needs a temperature sensor? (a) start a fan when hot (b) stop a robot near walls (c) measure classroom noise (d) make a parking alarm
12. 12.Which job needs a display? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) show the temperature
13. 13.🔍 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?
14. 14.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a rain sensor (c) a distance sensor (d) a temperature sensor
15. 15.True or false: to open blinds at sunrise, use a temperature sensor. (a) True (b) False
16. 16.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) an LED (d) a buzzer
17. 17.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a rain sensor (c) a gas sensor (d) a temperature sensor
18. 18.Which job needs a distance sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) stop a robot near walls (d) start a fan when hot
19. 19.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
20. 20.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a temperature sensor (c) a motion sensor (d) a soil moisture sensor
21. 21.Which job needs a sound sensor? (a) spot someone walking in (b) start a fan when hot (c) warn of a gas leak (d) measure classroom noise
22. 22.Which job needs a buzzer? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
23. 23.Which job needs a rain sensor? (a) start a fan when hot (b) close a window in rain (c) make a parking alarm (d) switch on lamps at dusk
24. 24.Which job needs a pump? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
25. 25.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
26. 26.True or false: to spot someone walking in, use a light sensor. (a) False (b) True
27. 27.Which job needs a motor? (a) beep an alarm (b) show the temperature (c) open a gate to 90° (d) spin a robot’s wheels
28. 28.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
29. 29.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
30. 30.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
31. 31.Which job needs a light sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) measure classroom noise (d) stop a robot near walls
32. 32.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a buzzer (d) a servo motor
33. 33.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
34. 34.True or false: to close a window in rain, use a distance sensor. (a) True (b) False
35. 35.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
36. 36.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a gas sensor (c) a light sensor (d) a distance sensor
37. 37.Which job needs an LED? (a) move water to plants (b) open a gate to 90° (c) show a status light (d) beep an alarm
38. 38.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a light sensor (c) a rain sensor (d) a sound sensor
39. 39.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a servo motor (c) a pump (d) a motor
40. 40.🔍 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?

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