Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 97 · 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 stop a robot near walls? (a) a sound sensor (b) a rain sensor (c) a distance sensor (d) a light sensor
2. 2.True or false: to close a window in rain, use a motion sensor. (a) True (b) False
3. 3.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
5. 5.True or false: to keep an incubator warm, use a gas sensor. (a) False (b) True
6. 6.Which job needs a servo motor? (a) spin a robot’s wheels (b) beep an alarm (c) open a gate to 90° (d) move water to plants
7. 7.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a rain sensor (c) a light sensor (d) a soil moisture sensor
8. 8.Which job needs a gas sensor? (a) switch on with a clap (b) keep an incubator warm (c) warn of a gas leak (d) close a window in rain
9. 9.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.Which job needs a buzzer? (a) move water to plants (b) turn to an exact angle (c) beep an alarm (d) spin a robot’s wheels
11. 11.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
12. 12.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a rain sensor (c) a light sensor (d) a temperature sensor
13. 13.Which job needs a display? (a) move water to plants (b) beep an alarm (c) open a gate to 90° (d) show the temperature
14. 14.True or false: to start a fan when hot, use a rain sensor. (a) True (b) False
15. 15.Which job needs a distance sensor? (a) switch on with a clap (b) spot someone walking in (c) stop a robot near walls (d) start a fan when hot
16. 16.Which job needs a pump? (a) show the temperature (b) beep an alarm (c) show a status light (d) move water to plants
17. 17.Which job needs a soil moisture sensor? (a) close a window in rain (b) warn of a gas leak (c) stop a robot near walls (d) water a dry plant
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a display (c) a buzzer (d) a servo motor
19. 19.Which job needs a temperature sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) start a fan when hot (d) close a window in rain
20. 20.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
21. 21.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a motion sensor (c) a gas sensor (d) a distance sensor
22. 22.🔍 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)?
23. 23.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a temperature sensor (c) a rain sensor (d) a distance sensor
24. 24.Which job needs a temperature sensor? (a) measure classroom noise (b) switch on with a clap (c) spot someone walking in (d) keep an incubator warm
25. 25.🔍 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)?
26. 26.Which job needs a motion sensor? (a) switch on with a clap (b) measure classroom noise (c) keep an incubator warm (d) spot someone walking in
27. 27.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
28. 28.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a servo motor (c) a buzzer (d) a pump
29. 29.🔍 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?
30. 30.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🔍 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)?
32. 32.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
33. 33.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) False (b) True
34. 34.Which job needs a rain sensor? (a) water a dry plant (b) spot someone walking in (c) stop a robot near walls (d) close a window in rain
35. 35.Which job needs a light sensor? (a) switch on lamps at dusk (b) close a window in rain (c) switch on with a clap (d) keep an incubator warm
36. 36.Which job needs an LED? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) open a gate to 90°
37. 37.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a motor (c) an LED (d) a display
38. 38.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a servo motor (c) a buzzer (d) an LED
39. 39.Which job needs a light sensor? (a) measure classroom noise (b) switch on with a clap (c) open blinds at sunrise (d) stop a robot near walls
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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