Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 260 · 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 pump? (a) beep an alarm (b) turn to an exact angle (c) spin a robot’s wheels (d) move water to plants
2. 2.🔍 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?
3. 3.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a distance sensor
4. 4.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.Which job needs an LED? (a) spin a robot’s wheels (b) turn to an exact angle (c) show the temperature (d) show a status light
6. 6.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a sound sensor (c) a motion sensor (d) a light sensor
7. 7.Which job needs a sound sensor? (a) close a window in rain (b) switch on with a clap (c) keep an incubator warm (d) stop a robot near walls
8. 8.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
9. 9.Which job needs a sound sensor? (a) spot someone walking in (b) keep an incubator warm (c) measure classroom noise (d) water a dry plant
10. 10.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a sound sensor
11. 11.True or false: to switch on with a clap, use a light sensor. (a) True (b) False
12. 12.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a display (d) an LED
13. 13.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) open blinds at sunrise (d) spot someone walking in
14. 14.True or false: to measure classroom noise, use a soil moisture sensor. (a) False (b) True
15. 15.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a soil moisture sensor (c) a rain sensor (d) a light sensor
16. 16.True or false: to measure classroom noise, use a gas sensor. (a) True (b) False
17. 17.Which job needs a soil moisture sensor? (a) water a dry plant (b) switch on with a clap (c) stop a robot near walls (d) switch on lamps at dusk
18. 18.Which job needs a buzzer? (a) turn to an exact angle (b) beep an alarm (c) open a gate to 90° (d) move water to plants
19. 19.Which job needs a servo motor? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) move water to plants
20. 20.Which job needs a motor? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
21. 21.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a soil moisture sensor (c) a light sensor (d) a gas sensor
22. 22.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
23. 23.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
24. 24.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) an LED (c) a pump (d) a servo motor
25. 25.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
27. 27.🔍 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?
28. 28.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
29. 29.🔍 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)?
30. 30.True or false: to measure classroom noise, use a rain sensor. (a) True (b) False
31. 31.🔍 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)?
32. 32.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a display (c) an LED (d) a servo motor
33. 33.🔍 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)?
34. 34.Which job needs a gas sensor? (a) measure classroom noise (b) warn of a gas leak (c) switch on with a clap (d) water a dry plant
35. 35.Which job needs a distance sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) warn of a gas leak (d) close a window in rain
36. 36.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a sound sensor (c) a gas sensor (d) a light sensor
37. 37.Which job needs a display? (a) beep an alarm (b) spin a robot’s wheels (c) move water to plants (d) show the temperature
38. 38.Which job needs a light sensor? (a) spot someone walking in (b) open blinds at sunrise (c) stop a robot near walls (d) water a dry plant
39. 39.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
40. 40.🔍 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)?

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