Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 96 · 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.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a light sensor (c) a soil moisture sensor (d) a motion sensor
3. 3.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a gas sensor (c) a soil moisture sensor (d) a sound sensor
4. 4.Which job needs a motor? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) show the temperature
5. 5.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
6. 6.Which job needs a servo motor? (a) turn to an exact angle (b) show a status light (c) show the temperature (d) spin a robot’s wheels
7. 7.Which job needs a sound sensor? (a) water a dry plant (b) open blinds at sunrise (c) spot someone walking in (d) measure classroom noise
8. 8.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) an LED (c) a motor (d) a pump
9. 9.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a display (c) a motor (d) a servo motor
11. 11.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a rain sensor (c) a soil moisture sensor (d) a sound sensor
12. 12.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
13. 13.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) a pump
14. 14.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
15. 15.Which job needs an LED? (a) show a status light (b) move water to plants (c) show the temperature (d) open a gate to 90°
16. 16.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
17. 17.🔍 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)?
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🔍 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)?
20. 20.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
21. 21.True or false: to stop a robot near walls, use a soil moisture sensor. (a) False (b) True
22. 22.Which job needs a display? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) show the temperature
23. 23.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) an LED (d) a servo motor
24. 24.True or false: to stop a robot near walls, use a rain sensor. (a) True (b) False
25. 25.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a distance sensor (c) a motion sensor (d) a soil moisture sensor
26. 26.Which job needs a sound sensor? (a) stop a robot near walls (b) start a fan when hot (c) switch on with a clap (d) keep an incubator warm
27. 27.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a servo motor (c) a buzzer (d) a pump
28. 28.Which job needs a soil moisture sensor? (a) measure classroom noise (b) switch on with a clap (c) spot someone walking in (d) water a dry plant
29. 29.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
30. 30.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a sound sensor (c) a gas sensor (d) a distance sensor
31. 31.Which job needs a pump? (a) beep an alarm (b) show the temperature (c) move water to plants (d) turn to an exact angle
32. 32.Which job needs a distance sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) stop a robot near walls (d) spot someone walking in
33. 33.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
34. 34.True or false: to water a dry plant, use a sound sensor. (a) True (b) False
35. 35.True or false: to close a window in rain, use a soil moisture sensor. (a) True (b) False
36. 36.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
37. 37.🔍 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)?
38. 38.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a pump (c) a servo motor (d) a buzzer
39. 39.Which job needs a rain sensor? (a) switch on with a clap (b) warn of a gas leak (c) switch on lamps at dusk (d) close a window in rain
40. 40.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids