Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 26 · 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 display? (a) beep an alarm (b) move water to plants (c) show the temperature (d) turn to an exact angle
2. 2.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) water a dry plant (c) switch on with a clap (d) open blinds at sunrise
3. 3.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a sound sensor
4. 4.Which job needs a buzzer? (a) beep an alarm (b) show a status light (c) move water to plants (d) show the temperature
5. 5.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a soil moisture sensor
6. 6.Which job needs a motion sensor? (a) keep an incubator warm (b) make a parking alarm (c) close a window in rain (d) spot someone walking in
7. 7.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
8. 8.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a distance sensor (c) a light sensor (d) a gas sensor
9. 9.Which job needs a temperature sensor? (a) switch on with a clap (b) start a fan when hot (c) make a parking alarm (d) close a window in rain
10. 10.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a rain sensor (c) a light sensor (d) a soil moisture sensor
11. 11.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
12. 12.Which job needs a motor? (a) show a status light (b) turn to an exact angle (c) open a gate to 90° (d) spin a robot’s wheels
13. 13.Which job needs a sound sensor? (a) spot someone walking in (b) keep an incubator warm (c) measure classroom noise (d) start a fan when hot
14. 14.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a sensor (d) a battery
15. 15.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) move water to plants (d) open a gate to 90°
16. 16.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
17. 17.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a sound sensor (d) a gas sensor
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 14 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) close a window in rain (b) keep an incubator warm (c) spot someone walking in (d) water a dry plant
20. 20.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a display (d) a motor
21. 21.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a motor (c) an LED (d) a display
22. 22.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a buzzer (c) a pump (d) a servo motor
23. 23.Which job needs a servo motor? (a) show the temperature (b) move water to plants (c) turn to an exact angle (d) show a status light
24. 24.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
27. 27.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a motor (d) an LED
28. 28.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
29. 29.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) an LED (c) a buzzer (d) a motor
30. 30.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a rain sensor
31. 31.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
33. 33.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) a display (d) a buzzer
34. 34.Which job needs a gas sensor? (a) close a window in rain (b) spot someone walking in (c) stop a robot near walls (d) warn of a gas leak
35. 35.🔍 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?
36. 36.🔍 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?
37. 37.Which job needs a pump? (a) show the temperature (b) open a gate to 90° (c) turn to an exact angle (d) move water to plants
38. 38.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) an LED (d) a pump
39. 39.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.Which job needs an LED? (a) spin a robot’s wheels (b) beep an alarm (c) open a gate to 90° (d) show a status light

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