Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 222 · 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 sensor would you use to make a parking alarm? (a) a sound sensor (b) a distance sensor (c) a soil moisture sensor (d) a gas sensor
2. 2.🔍 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?
3. 3.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a buzzer (c) a servo motor (d) an LED
4. 4.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a motion sensor (c) a soil moisture sensor (d) a light sensor
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a fuse (d) a power source
6. 6.Which job needs a motion sensor? (a) spot someone walking in (b) stop a robot near walls (c) switch on with a clap (d) measure classroom noise
7. 7.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
9. 9.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a light sensor (c) a rain sensor (d) a temperature sensor
10. 10.Which job needs a temperature sensor? (a) keep an incubator warm (b) warn of a gas leak (c) open blinds at sunrise (d) switch on lamps at dusk
11. 11.Which job needs a motor? (a) open a gate to 90° (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
12. 12.Which job needs a rain sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) close a window in rain (d) make a parking alarm
13. 13.Which job needs a sound sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) keep an incubator warm (d) switch on with a clap
14. 14.Which job needs a display? (a) move water to plants (b) open a gate to 90° (c) beep an alarm (d) show the temperature
15. 15.Which job needs a gas sensor? (a) switch on lamps at dusk (b) water a dry plant (c) warn of a gas leak (d) start a fan when hot
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) a pump (d) a motor
18. 18.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a servo motor (c) a pump (d) a buzzer
19. 19.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a temperature sensor (c) a rain sensor (d) a gas sensor
20. 20.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
21. 21.Which job needs a pump? (a) spin a robot’s wheels (b) show the temperature (c) turn to an exact angle (d) move water to plants
22. 22.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
23. 23.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a display (d) a pump
24. 24.Which job needs a servo motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) move water to plants (d) show the temperature
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a sound sensor (c) a motion sensor (d) a soil moisture sensor
27. 27.🔍 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)?
28. 28.Which job needs a buzzer? (a) show a status light (b) beep an alarm (c) open a gate to 90° (d) move water to plants
29. 29.Which job needs an LED? (a) spin a robot’s wheels (b) show a status light (c) turn to an exact angle (d) move water to plants
30. 30.🔍 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?
31. 31.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a rain sensor (c) a sound sensor (d) a light sensor
32. 32.Which job needs a temperature sensor? (a) measure classroom noise (b) start a fan when hot (c) close a window in rain (d) make a parking alarm
33. 33.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a motor (c) a buzzer (d) a servo motor
34. 34.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a light sensor (c) a rain sensor (d) a sound sensor
35. 35.🔍 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?
36. 36.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
37. 37.Which job needs a distance sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) stop a robot near walls (d) keep an incubator warm
38. 38.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a motion sensor (c) a distance sensor (d) a sound sensor
39. 39.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
40. 40.🔍 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)?

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