Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 250 · 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 sound sensor? (a) spot someone walking in (b) switch on with a clap (c) water a dry plant (d) make a parking alarm
2. 2.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) True (b) False
3. 3.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) move water to plants
4. 4.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
5. 5.Which job needs a servo motor? (a) open a gate to 90° (b) beep an alarm (c) move water to plants (d) show a status light
6. 6.Which job needs an LED? (a) move water to plants (b) turn to an exact angle (c) spin a robot’s wheels (d) show a status light
7. 7.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
8. 8.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a servo motor (c) an LED (d) a pump
9. 9.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
11. 11.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
12. 12.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a soil moisture sensor (c) a rain sensor (d) a motion sensor
13. 13.🔍 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)?
14. 14.Which job needs a rain sensor? (a) spot someone walking in (b) close a window in rain (c) make a parking alarm (d) measure classroom noise
15. 15.Which job needs a buzzer? (a) turn to an exact angle (b) beep an alarm (c) move water to plants (d) open a gate to 90°
16. 16.Which job needs a motion sensor? (a) keep an incubator warm (b) start a fan when hot (c) measure classroom noise (d) spot someone walking in
17. 17.Which job needs a distance sensor? (a) warn of a gas leak (b) start a fan when hot (c) keep an incubator warm (d) make a parking alarm
18. 18.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a soil moisture sensor (c) a rain sensor (d) a temperature sensor
19. 19.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a pump (d) a servo motor
20. 20.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a soil moisture sensor (c) a motion sensor (d) a temperature sensor
21. 21.True or false: to make a parking alarm, use a light sensor. (a) True (b) False
22. 22.Which job needs a light sensor? (a) start a fan when hot (b) water a dry plant (c) stop a robot near walls (d) switch on lamps at dusk
23. 23.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) turn to an exact angle (d) beep an alarm
24. 24.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a temperature sensor (c) a motion sensor (d) a rain sensor
25. 25.Which job needs a display? (a) show the temperature (b) move water to plants (c) turn to an exact angle (d) show a status light
26. 26.True or false: to switch on with a clap, use a temperature sensor. (a) True (b) False
27. 27.🔍 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?
28. 28.Which job needs a soil moisture sensor? (a) start a fan when hot (b) warn of a gas leak (c) water a dry plant (d) switch on lamps at dusk
29. 29.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a motion sensor (c) a temperature sensor (d) a sound sensor
30. 30.True or false: to measure classroom noise, use a soil moisture sensor. (a) False (b) True
31. 31.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
32. 32.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a motion sensor
33. 33.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
34. 34.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a display (c) a motor (d) a buzzer
35. 35.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
37. 37.Which job needs a distance sensor? (a) stop a robot near walls (b) close a window in rain (c) measure classroom noise (d) water a dry plant
38. 38.🔍 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?
39. 39.True or false: to close a window in rain, use a distance sensor. (a) True (b) False
40. 40.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a temperature sensor

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