Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 221 · 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 soil moisture sensor? (a) water a dry plant (b) open blinds at sunrise (c) close a window in rain (d) make a parking alarm
2. 2.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) an LED (c) a display (d) a motor
3. 3.Which job needs a rain sensor? (a) keep an incubator warm (b) close a window in rain (c) stop a robot near walls (d) switch on with a clap
4. 4.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.Which job needs a motor? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
8. 8.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
9. 9.Which job needs a light sensor? (a) keep an incubator warm (b) close a window in rain (c) open blinds at sunrise (d) spot someone walking in
10. 10.True or false: to open blinds at sunrise, use a motion sensor. (a) True (b) False
11. 11.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a rain sensor
12. 12.Which job needs a gas sensor? (a) water a dry plant (b) warn of a gas leak (c) close a window in rain (d) measure classroom noise
13. 13.Which job needs a light sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) start a fan when hot (d) spot someone walking in
14. 14.Which job needs a buzzer? (a) beep an alarm (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
15. 15.Which job needs a temperature sensor? (a) water a dry plant (b) start a fan when hot (c) stop a robot near walls (d) switch on with a clap
16. 16.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
17. 17.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a servo motor (c) a motor (d) an LED
19. 19.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
20. 20.Which job needs a distance sensor? (a) keep an incubator warm (b) stop a robot near walls (c) switch on lamps at dusk (d) open blinds at sunrise
21. 21.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
22. 22.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
23. 23.Which job needs a pump? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) move water to plants
24. 24.🔍 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?
25. 25.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
26. 26.Which job needs a motion sensor? (a) spot someone walking in (b) measure classroom noise (c) water a dry plant (d) keep an incubator warm
27. 27.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a gas sensor (c) a sound sensor (d) a distance sensor
28. 28.🔍 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?
29. 29.True or false: to keep an incubator warm, use a rain sensor. (a) True (b) False
30. 30.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) an LED (c) a servo motor (d) a buzzer
31. 31.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
32. 32.Which job needs a display? (a) show a status light (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
33. 33.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a servo motor (c) an LED (d) a pump
34. 34.Which job needs a servo motor? (a) move water to plants (b) beep an alarm (c) show a status light (d) open a gate to 90°
35. 35.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
36. 36.True or false: to close a window in rain, use a light sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
38. 38.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a sound sensor (c) a gas sensor (d) a motion sensor
39. 39.🔍 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?
40. 40.🔍 An object is 153 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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