Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 21 · 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 job needs a gas sensor? (a) open blinds at sunrise (b) close a window in rain (c) warn of a gas leak (d) switch on lamps at dusk
2. 2.🔍 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)?
3. 3.Which job needs a temperature sensor? (a) close a window in rain (b) switch on lamps at dusk (c) switch on with a clap (d) keep an incubator warm
4. 4.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.🔍 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?
6. 6.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
7. 7.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
9. 9.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a gas sensor
10. 10.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
11. 11.Which job needs a rain sensor? (a) stop a robot near walls (b) spot someone walking in (c) make a parking alarm (d) close a window in rain
12. 12.Which job needs a sound sensor? (a) warn of a gas leak (b) start a fan when hot (c) switch on with a clap (d) keep an incubator warm
13. 13.Which job needs an LED? (a) spin a robot’s wheels (b) beep an alarm (c) show the temperature (d) show a status light
14. 14.Which job needs a buzzer? (a) beep an alarm (b) spin a robot’s wheels (c) open a gate to 90° (d) turn to an exact angle
15. 15.Which job needs a motion sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) measure classroom noise (d) spot someone walking in
16. 16.Which job needs a servo motor? (a) show a status light (b) beep an alarm (c) turn to an exact angle (d) spin a robot’s wheels
17. 17.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a soil moisture sensor
18. 18.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a soil moisture sensor
19. 19.Which job needs a soil moisture sensor? (a) spot someone walking in (b) switch on with a clap (c) start a fan when hot (d) water a dry plant
20. 20.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) an LED (d) a servo motor
22. 22.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a servo motor (c) a pump (d) a buzzer
23. 23.🔍 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?
24. 24.Which job needs a temperature sensor? (a) make a parking alarm (b) open blinds at sunrise (c) stop a robot near walls (d) start a fan when hot
25. 25.🔍 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?
26. 26.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a motor (c) a buzzer (d) a pump
27. 27.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) a servo motor (d) a pump
28. 28.🔍 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?
29. 29.Which job needs a distance sensor? (a) start a fan when hot (b) water a dry plant (c) close a window in rain (d) stop a robot near walls
30. 30.Which job needs a motor? (a) show the temperature (b) show a status light (c) move water to plants (d) spin a robot’s wheels
31. 31.🔍 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?
32. 32.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.Which job needs a pump? (a) beep an alarm (b) show the temperature (c) open a gate to 90° (d) move water to plants
34. 34.Which job needs a servo motor? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm
35. 35.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a motion sensor (c) a temperature sensor (d) a light sensor
36. 36.Which job needs a display? (a) spin a robot’s wheels (b) open a gate to 90° (c) show the temperature (d) show a status light
37. 37.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a rain sensor (c) a sound sensor (d) a gas sensor
38. 38.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
39. 39.Which job needs a light sensor? (a) switch on with a clap (b) water a dry plant (c) close a window in rain (d) switch on lamps at dusk
40. 40.🔍 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?

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