Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 44 · 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 stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a gas sensor (d) a temperature sensor
2. 2.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a gas sensor (c) a distance sensor (d) a soil moisture sensor
3. 3.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) an LED (c) a servo motor (d) a buzzer
4. 4.Which job needs a gas sensor? (a) measure classroom noise (b) warn of a gas leak (c) spot someone walking in (d) switch on lamps at dusk
5. 5.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a servo motor (c) a pump (d) a motor
6. 6.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a temperature sensor (c) a sound sensor (d) a soil moisture sensor
7. 7.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a display (c) an LED (d) a servo motor
8. 8.Which job needs a servo motor? (a) move water to plants (b) spin a robot’s wheels (c) turn to an exact angle (d) beep an alarm
9. 9.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) measure classroom noise (c) water a dry plant (d) close a window in rain
10. 10.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.🔍 Which sensor would you use to water a dry plant? (a) a rain sensor (b) a soil moisture sensor (c) a distance sensor (d) a motion sensor
12. 12.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
13. 13.Which job needs a motor? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
14. 14.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
15. 15.Which job needs an LED? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) move water to plants
16. 16.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a display (c) a pump (d) a motor
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
19. 19.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
20. 20.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
22. 22.Which job needs a rain sensor? (a) keep an incubator warm (b) warn of a gas leak (c) open blinds at sunrise (d) close a window in rain
23. 23.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) a display (d) a servo motor
24. 24.🔍 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?
25. 25.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a rain sensor (c) a sound sensor (d) a light sensor
26. 26.True or false: to water a dry plant, use a temperature sensor. (a) True (b) False
27. 27.Which job needs a distance sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) measure classroom noise (d) make a parking alarm
28. 28.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
29. 29.Which job needs a light sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) switch on with a clap (d) measure classroom noise
30. 30.🔍 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)?
31. 31.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) open a gate to 90° (d) spin a robot’s wheels
32. 32.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a motion sensor
33. 33.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
34. 34.Which job needs a light sensor? (a) switch on with a clap (b) start a fan when hot (c) switch on lamps at dusk (d) keep an incubator warm
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a rain sensor (c) a motion sensor (d) a sound sensor
36. 36.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a buzzer (c) an LED (d) a display
37. 37.True or false: to keep an incubator warm, use a motion sensor. (a) True (b) False
38. 38.Which job needs a sound sensor? (a) make a parking alarm (b) measure classroom noise (c) warn of a gas leak (d) keep an incubator warm
39. 39.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
40. 40.Which job needs a temperature sensor? (a) start a fan when hot (b) stop a robot near walls (c) switch on lamps at dusk (d) switch on with a clap

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