Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 312 · 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 an LED? (a) open a gate to 90° (b) show the temperature (c) spin a robot’s wheels (d) show a status light
2. 2.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a soil moisture sensor (c) a temperature sensor (d) a rain sensor
3. 3.Which job needs a sound sensor? (a) switch on with a clap (b) open blinds at sunrise (c) close a window in rain (d) keep an incubator warm
4. 4.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a display (c) a servo motor (d) a pump
5. 5.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a distance sensor (c) a gas sensor (d) a soil moisture sensor
6. 6.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
7. 7.🔍 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?
8. 8.True or false: to start a fan when hot, use a soil moisture sensor. (a) False (b) True
9. 9.Which job needs a motion sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) stop a robot near walls (d) spot someone walking in
10. 10.Which job needs a display? (a) show the temperature (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
11. 11.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a servo motor (d) a pump
12. 12.🔍 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?
13. 13.Which job needs a rain sensor? (a) open blinds at sunrise (b) close a window in rain (c) stop a robot near walls (d) start a fan when hot
14. 14.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a servo motor (d) a motor
15. 15.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a pump (c) a motor (d) an LED
16. 16.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
17. 17.Which job needs a buzzer? (a) beep an alarm (b) open a gate to 90° (c) show the temperature (d) move water to plants
18. 18.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) close a window in rain (d) water a dry plant
19. 19.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a rain sensor (c) a gas sensor (d) a distance sensor
20. 20.True or false: to warn of a gas leak, use a light sensor. (a) False (b) True
21. 21.True or false: to water a dry plant, use a distance sensor. (a) False (b) True
22. 22.Which job needs a pump? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
23. 23.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a motion sensor (c) a rain sensor (d) a soil moisture sensor
24. 24.Which job needs a servo motor? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
25. 25.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
26. 26.🔍 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)?
27. 27.🔍 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)?
28. 28.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False
29. 29.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
30. 30.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a sound sensor (c) a light sensor (d) a rain sensor
31. 31.True or false: to keep an incubator warm, use a sound sensor. (a) False (b) True
32. 32.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a temperature sensor (c) a soil moisture sensor (d) a light sensor
33. 33.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
34. 34.Which job needs a distance sensor? (a) warn of a gas leak (b) stop a robot near walls (c) water a dry plant (d) keep an incubator warm
35. 35.🔍 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)?
36. 36.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
37. 37.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a servo motor (c) a pump (d) a motor
38. 38.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a rain sensor (d) a light sensor
39. 39.🔍 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)?
40. 40.True or false: to spot someone walking in, use a temperature sensor. (a) False (b) True

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