Electronics Worksheet: Sensors and Actuators

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

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