Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 60 · 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 switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a rain sensor (d) a distance sensor
2. 2.🔍 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)?
3. 3.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor
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.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
6. 6.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
8. 8.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a buzzer (c) an LED (d) a motor
9. 9.🔍 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)?
10. 10.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
12. 12.🔍 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)?
13. 13.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) an LED (d) a pump
14. 14.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
15. 15.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
16. 16.True or false: to switch on with a clap, use a rain sensor. (a) True (b) False
17. 17.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
18. 18.🔍 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)?
19. 19.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
20. 20.Which job needs a motion sensor? (a) switch on lamps at dusk (b) water a dry plant (c) spot someone walking in (d) make a parking alarm
21. 21.Which job needs a sound sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) measure classroom noise (d) water a dry plant
22. 22.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
23. 23.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
24. 24.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a motor (c) a servo motor (d) an LED
25. 25.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a gas sensor (c) a sound sensor (d) a rain sensor
26. 26.True or false: to warn of a gas leak, use a sound sensor. (a) False (b) True
27. 27.Which job needs a gas sensor? (a) switch on with a clap (b) keep an incubator warm (c) stop a robot near walls (d) warn of a gas leak
28. 28.Which job needs a light sensor? (a) water a dry plant (b) keep an incubator warm (c) switch on lamps at dusk (d) measure classroom noise
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.True or false: to keep an incubator warm, use a gas sensor. (a) True (b) False
31. 31.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
32. 32.Which job needs a motor? (a) show the temperature (b) spin a robot’s wheels (c) beep an alarm (d) turn to an exact angle
33. 33.Which job needs a distance sensor? (a) open blinds at sunrise (b) make a parking alarm (c) water a dry plant (d) measure classroom noise
34. 34.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
35. 35.Which job needs a rain sensor? (a) water a dry plant (b) keep an incubator warm (c) close a window in rain (d) stop a robot near walls
36. 36.🔍 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?
37. 37.Which job needs a pump? (a) open a gate to 90° (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
38. 38.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
39. 39.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a display (c) a motor (d) a pump
40. 40.🔍 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)?

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