Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 2 · 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 motor? (a) show a status light (b) turn to an exact angle (c) beep an alarm (d) spin a robot’s wheels
2. 2.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a pump (c) an LED (d) a motor
3. 3.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
4. 4.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
5. 5.Which job needs a pump? (a) turn to an exact angle (b) move water to plants (c) beep an alarm (d) show a status light
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
7. 7.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a rain sensor
8. 8.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a rain sensor
9. 9.Which job needs a light sensor? (a) measure classroom noise (b) water a dry plant (c) keep an incubator warm (d) switch on lamps at dusk
10. 10.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) a motor (d) a pump
11. 11.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
12. 12.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a buzzer (c) a pump (d) a display
14. 14.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a temperature sensor (c) a rain sensor (d) a soil moisture sensor
15. 15.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a motion sensor (d) a sound sensor
16. 16.Which job needs a servo motor? (a) show the temperature (b) show a status light (c) beep an alarm (d) turn to an exact angle
17. 17.Which job needs a rain sensor? (a) measure classroom noise (b) close a window in rain (c) water a dry plant (d) switch on lamps at dusk
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a light sensor (c) a rain sensor (d) a motion sensor
20. 20.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a gas sensor
21. 21.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
22. 22.🔍 A distance sensor sends a sound pulse and hears the echo 18 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 stop a robot near walls? (a) a rain sensor (b) a motion sensor (c) a distance sensor (d) a gas sensor
24. 24.Which job needs an LED? (a) show a status light (b) move water to plants (c) beep an alarm (d) open a gate to 90°
25. 25.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a distance sensor (c) a motion sensor (d) a rain sensor
26. 26.🔍 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)?
27. 27.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a buzzer (c) a display (d) an LED
28. 28.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
29. 29.🔍 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)?
30. 30.True or false: to measure classroom noise, use a rain sensor. (a) False (b) True
31. 31.🔍 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)?
32. 32.Which job needs a display? (a) show a status light (b) spin a robot’s wheels (c) open a gate to 90° (d) show the temperature
33. 33.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a buzzer (c) a motor (d) a servo motor
34. 34.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a pump (d) a buzzer
35. 35.Which job needs a temperature sensor? (a) spot someone walking in (b) stop a robot near walls (c) keep an incubator warm (d) measure classroom noise
36. 36.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) an LED (c) a servo motor (d) a pump
37. 37.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a distance sensor (c) a gas sensor (d) a soil moisture sensor
38. 38.Which job needs a soil moisture sensor? (a) measure classroom noise (b) keep an incubator warm (c) water a dry plant (d) make a parking alarm
39. 39.🔍 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)?
40. 40.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False

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