Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 19 · 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 gas sensor (c) a temperature sensor (d) a light sensor
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) an LED (c) a display (d) a motor
3. 3.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
4. 4.Which job needs a light sensor? (a) water a dry plant (b) spot someone walking in (c) warn of a gas leak (d) open blinds at sunrise
5. 5.Which job needs a pump? (a) turn to an exact angle (b) spin a robot’s wheels (c) show the temperature (d) move water to plants
6. 6.Which job needs a motion sensor? (a) start a fan when hot (b) warn of a gas leak (c) spot someone walking in (d) switch on with a clap
7. 7.Which job needs a display? (a) move water to plants (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
8. 8.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a soil moisture sensor (c) a light sensor (d) a gas sensor
9. 9.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) an LED (c) a display (d) a buzzer
10. 10.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
11. 11.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a temperature sensor (c) a sound sensor (d) a gas sensor
12. 12.Which job needs a gas sensor? (a) warn of a gas leak (b) measure classroom noise (c) stop a robot near walls (d) open blinds at sunrise
13. 13.Which job needs a light sensor? (a) switch on with a clap (b) keep an incubator warm (c) water a dry plant (d) switch on lamps at dusk
14. 14.Which job needs a sound sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) make a parking alarm (d) open blinds at sunrise
15. 15.Which job needs a temperature sensor? (a) stop a robot near walls (b) measure classroom noise (c) start a fan when hot (d) warn of a gas leak
16. 16.Which job needs a distance sensor? (a) stop a robot near walls (b) close a window in rain (c) keep an incubator warm (d) spot someone walking in
17. 17.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
19. 19.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) keep an incubator warm (d) close a window in rain
20. 20.🔍 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)?
21. 21.Which job needs a soil moisture sensor? (a) switch on with a clap (b) make a parking alarm (c) water a dry plant (d) start a fan when hot
22. 22.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a motion sensor (d) a distance sensor
23. 23.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a servo motor (c) a pump (d) a motor
24. 24.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
26. 26.Which job needs a motor? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) beep an alarm
27. 27.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a sound sensor (c) a soil moisture sensor (d) a rain sensor
29. 29.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a soil moisture sensor (c) a sound sensor (d) a temperature sensor
30. 30.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
31. 31.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
33. 33.🔍 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)?
34. 34.True or false: to warn of a gas leak, use a soil moisture sensor. (a) True (b) False
35. 35.🔍 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?
36. 36.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False
37. 37.True or false: to water a dry plant, use a motion sensor. (a) True (b) False
38. 38.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) move water to plants (d) beep an alarm
39. 39.🔍 An object is 68 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 rain sensor? (a) spot someone walking in (b) open blinds at sunrise (c) keep an incubator warm (d) close a window in rain

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