Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 31 · 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 measure classroom noise? (a) a rain sensor (b) a temperature sensor (c) a sound sensor (d) a motion sensor
2. 2.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.Which job needs a temperature sensor? (a) make a parking alarm (b) close a window in rain (c) start a fan when hot (d) spot someone walking in
4. 4.Which job needs a soil moisture sensor? (a) start a fan when hot (b) stop a robot near walls (c) water a dry plant (d) switch on with a clap
5. 5.Which job needs a display? (a) show a status light (b) turn to an exact angle (c) show the temperature (d) move water to plants
6. 6.True or false: to spot someone walking in, use a distance sensor. (a) False (b) True
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) an output (d) a power source
8. 8.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a light sensor (c) a rain sensor (d) a gas sensor
9. 9.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.Which job needs a rain sensor? (a) measure classroom noise (b) open blinds at sunrise (c) switch on lamps at dusk (d) close a window in rain
11. 11.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a rain sensor (c) a light sensor (d) a distance sensor
12. 12.Which job needs a light sensor? (a) keep an incubator warm (b) spot someone walking in (c) open blinds at sunrise (d) make a parking alarm
13. 13.Which job needs a sound sensor? (a) spot someone walking in (b) switch on with a clap (c) keep an incubator warm (d) water a dry plant
14. 14.Which job needs a gas sensor? (a) warn of a gas leak (b) make a parking alarm (c) start a fan when hot (d) water a dry plant
15. 15.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
16. 16.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a buzzer (c) an LED (d) a servo motor
17. 17.Which job needs a temperature sensor? (a) make a parking alarm (b) open blinds at sunrise (c) stop a robot near walls (d) keep an incubator warm
18. 18.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) an LED (c) a servo motor (d) a motor
20. 20.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a gas sensor (c) a soil moisture sensor (d) a sound sensor
21. 21.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) a pump (d) a buzzer
22. 22.True or false: to open blinds at sunrise, use a sound sensor. (a) False (b) True
23. 23.🔍 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)?
24. 24.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
25. 25.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a rain sensor
26. 26.True or false: to water a dry plant, use a gas sensor. (a) True (b) False
27. 27.🔍 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)?
28. 28.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.Which job needs a pump? (a) show a status light (b) move water to plants (c) spin a robot’s wheels (d) open a gate to 90°
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.True or false: to water a dry plant, use a distance sensor. (a) False (b) True
32. 32.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) an LED (c) a display (d) a motor
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False
35. 35.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a display (c) an LED (d) a pump
36. 36.Which job needs a servo motor? (a) open a gate to 90° (b) show the temperature (c) spin a robot’s wheels (d) move water to plants
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 lamps at dusk? (a) a motion sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
39. 39.🔍 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?
40. 40.Which job needs a distance sensor? (a) keep an incubator warm (b) measure classroom noise (c) open blinds at sunrise (d) make a parking alarm

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