Electronics Worksheet: Sensors and Actuators

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

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