Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 237 · 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.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
2. 2.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a distance sensor
3. 3.Which job needs a buzzer? (a) beep an alarm (b) show the temperature (c) move water to plants (d) turn to an exact angle
4. 4.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a pump (d) a buzzer
6. 6.Which job needs a rain sensor? (a) close a window in rain (b) switch on with a clap (c) start a fan when hot (d) measure classroom noise
7. 7.Which job needs a pump? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
8. 8.Which job needs a sound sensor? (a) open blinds at sunrise (b) switch on with a clap (c) water a dry plant (d) close a window in rain
9. 9.Which job needs a gas sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) start a fan when hot (d) stop a robot near walls
10. 10.🔍 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?
11. 11.Which job needs a distance sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) spot someone walking in (d) make a parking alarm
12. 12.Which job needs a light sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) keep an incubator warm (d) water a dry plant
13. 13.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a buzzer (c) a motor (d) a display
14. 14.True or false: to switch on lamps at dusk, use a gas sensor. (a) True (b) False
15. 15.🔍 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)?
16. 16.🔍 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?
17. 17.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
18. 18.Which job needs a display? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) turn to an exact angle
19. 19.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) switch on with a clap (c) spot someone walking in (d) water a dry plant
20. 20.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) beep an alarm (d) spin a robot’s wheels
21. 21.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a pump (c) a servo motor (d) a buzzer
22. 22.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a rain sensor (c) a distance sensor (d) a soil moisture sensor
23. 23.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
24. 24.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
25. 25.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) an LED (c) a display (d) a servo motor
26. 26.Which job needs a servo motor? (a) move water to plants (b) turn to an exact angle (c) spin a robot’s wheels (d) show the temperature
27. 27.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a display (c) a buzzer (d) a motor
28. 28.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
29. 29.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
30. 30.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a pump (c) a servo motor (d) a motor
31. 31.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
32. 32.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
33. 33.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) water a dry plant (d) start a fan when hot
34. 34.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
35. 35.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a rain sensor
36. 36.True or false: to switch on with a clap, use a distance sensor. (a) False (b) True
37. 37.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
38. 38.True or false: to stop a robot near walls, use a sound sensor. (a) False (b) True
39. 39.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
40. 40.True or false: to measure classroom noise, use a motion sensor. (a) False (b) True

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