Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 66 · 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 sensor would you use to start a fan when hot? (a) a sound sensor (b) a gas sensor (c) a distance sensor (d) a temperature sensor
2. 2.Which job needs a display? (a) show a status light (b) show the temperature (c) spin a robot’s wheels (d) turn to an exact angle
3. 3.🔍 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)?
4. 4.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a temperature sensor (c) a gas sensor (d) a sound sensor
5. 5.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a motor (c) a pump (d) an LED
6. 6.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
7. 7.Which job needs a buzzer? (a) turn to an exact angle (b) open a gate to 90° (c) beep an alarm (d) show a status light
8. 8.Which job needs a servo motor? (a) move water to plants (b) turn to an exact angle (c) beep an alarm (d) show a status light
9. 9.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a pump (c) a motor (d) a display
10. 10.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
11. 11.Which job needs a sound sensor? (a) switch on with a clap (b) open blinds at sunrise (c) stop a robot near walls (d) spot someone walking in
12. 12.Which job needs a servo motor? (a) show the temperature (b) spin a robot’s wheels (c) show a status light (d) open a gate to 90°
13. 13.Which job needs a motion sensor? (a) water a dry plant (b) spot someone walking in (c) stop a robot near walls (d) switch on with a clap
14. 14.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
15. 15.Which job needs a soil moisture sensor? (a) close a window in rain (b) start a fan when hot (c) water a dry plant (d) switch on with a clap
16. 16.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) an LED (c) a display (d) a pump
17. 17.Which job needs a sound sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) measure classroom noise (d) open blinds at sunrise
18. 18.Which job needs a motor? (a) spin a robot’s wheels (b) show a status light (c) move water to plants (d) turn to an exact angle
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a distance sensor (d) a rain sensor
21. 21.Which job needs a rain sensor? (a) measure classroom noise (b) start a fan when hot (c) close a window in rain (d) stop a robot near walls
22. 22.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a buzzer (c) a pump (d) an LED
23. 23.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
24. 24.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a rain sensor (c) a motion sensor (d) a temperature sensor
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.True or false: to open blinds at sunrise, use a motion sensor. (a) False (b) True
28. 28.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a buzzer (c) an LED (d) a motor
29. 29.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
30. 30.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
31. 31.Which job needs a pump? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) turn to an exact angle
32. 32.Which job needs a temperature sensor? (a) measure classroom noise (b) start a fan when hot (c) spot someone walking in (d) water a dry plant
33. 33.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
34. 34.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a gas sensor (c) a distance sensor (d) a temperature sensor
35. 35.True or false: to spot someone walking in, use a soil moisture sensor. (a) False (b) True
36. 36.Which job needs a light sensor? (a) stop a robot near walls (b) water a dry plant (c) switch on lamps at dusk (d) start a fan when hot
37. 37.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a light sensor (c) a motion sensor (d) a rain sensor
39. 39.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a soil moisture sensor
40. 40.Which job needs a distance sensor? (a) make a parking alarm (b) keep an incubator warm (c) spot someone walking in (d) switch on lamps at dusk

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