Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 5 · 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.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
2. 2.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
3. 3.Which job needs a temperature sensor? (a) make a parking alarm (b) stop a robot near walls (c) start a fan when hot (d) switch on lamps at dusk
4. 4.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.True or false: to switch on with a clap, use a light sensor. (a) False (b) True
6. 6.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
7. 7.Which job needs a rain sensor? (a) make a parking alarm (b) close a window in rain (c) start a fan when hot (d) warn of a gas leak
8. 8.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a buzzer (c) a display (d) an LED
9. 9.Which job needs a sound sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) water a dry plant (d) start a fan when hot
10. 10.🔍 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?
11. 11.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) a motor (d) a display
12. 12.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.True or false: to open blinds at sunrise, use a rain sensor. (a) False (b) True
14. 14.True or false: to water a dry plant, use a light sensor. (a) True (b) False
15. 15.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.Which job needs a motion sensor? (a) switch on with a clap (b) warn of a gas leak (c) water a dry plant (d) spot someone walking in
17. 17.Which job needs a light sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) start a fan when hot (d) make a parking alarm
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a fuse (d) a power source
19. 19.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) an LED (d) a pump
20. 20.Which job needs a gas sensor? (a) measure classroom noise (b) warn of a gas leak (c) switch on lamps at dusk (d) switch on with a clap
21. 21.🔍 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)?
22. 22.🔍 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?
23. 23.Which job needs a distance sensor? (a) spot someone walking in (b) close a window in rain (c) make a parking alarm (d) open blinds at sunrise
24. 24.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) a servo motor (d) a buzzer
25. 25.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a display (c) a buzzer (d) an LED
26. 26.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a display (c) a servo motor (d) a buzzer
28. 28.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
29. 29.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a rain sensor (c) a light sensor (d) a motion sensor
30. 30.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a temperature sensor (c) a motion sensor (d) a gas sensor
31. 31.Which job needs a display? (a) spin a robot’s wheels (b) beep an alarm (c) show the temperature (d) turn to an exact angle
32. 32.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a distance sensor (c) a soil moisture sensor (d) a temperature sensor
33. 33.Which job needs a temperature sensor? (a) water a dry plant (b) close a window in rain (c) make a parking alarm (d) keep an incubator warm
34. 34.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a soil moisture sensor
35. 35.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a sound sensor (c) a soil moisture sensor (d) a light sensor
36. 36.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
37. 37.🔍 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)?
38. 38.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a motion sensor (c) a soil moisture sensor (d) a rain sensor
39. 39.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a sound sensor (c) a gas sensor (d) a rain sensor
40. 40.🔍 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?

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