Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 296 · 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 pump? (a) spin a robot’s wheels (b) beep an alarm (c) move water to plants (d) show a status light
2. 2.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) a servo motor (d) a pump
3. 3.Which job needs a distance sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) start a fan when hot (d) open blinds at sunrise
4. 4.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) move water to plants (d) open a gate to 90°
5. 5.Which job needs a buzzer? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
6. 6.Which job needs a display? (a) turn to an exact angle (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
7. 7.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
8. 8.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) False (b) True
9. 9.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a soil moisture sensor (d) a rain sensor
10. 10.Which job needs a servo motor? (a) move water to plants (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
11. 11.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a display (c) a motor (d) an LED
12. 12.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a sound sensor
13. 13.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
14. 14.🔍 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?
15. 15.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a motion sensor (c) a soil moisture sensor (d) a sound sensor
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
18. 18.🔍 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)?
19. 19.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) close a window in rain (c) keep an incubator warm (d) warn of a gas leak
20. 20.Which job needs a soil moisture sensor? (a) water a dry plant (b) keep an incubator warm (c) switch on lamps at dusk (d) open blinds at sunrise
21. 21.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
22. 22.Which job needs a motor? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
23. 23.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.Which job needs a gas sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) warn of a gas leak (d) water a dry plant
25. 25.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a motor (c) a servo motor (d) a display
26. 26.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
27. 27.Which job needs a motion sensor? (a) spot someone walking in (b) keep an incubator warm (c) stop a robot near walls (d) open blinds at sunrise
28. 28.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
29. 29.Which job needs a light sensor? (a) measure classroom noise (b) water a dry plant (c) switch on lamps at dusk (d) start a fan when hot
30. 30.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) open a gate to 90° (d) spin a robot’s wheels
31. 31.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
32. 32.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) True (b) False
33. 33.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
34. 34.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a sound sensor (c) a distance sensor (d) a soil moisture sensor
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.True or false: to make a parking alarm, use a soil moisture sensor. (a) True (b) False
38. 38.True or false: to open blinds at sunrise, use a temperature sensor. (a) True (b) False
39. 39.True or false: to measure classroom noise, use a light sensor. (a) False (b) True
40. 40.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a pump (c) an LED (d) a display

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