Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 271 · 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.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
2. 2.Which job needs a light sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) water a dry plant (d) spot someone walking in
3. 3.⚙️ Which actuator would you use to show a status light? (a) a display (b) a motor (c) an LED (d) a buzzer
4. 4.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) water a dry plant (d) measure classroom noise
5. 5.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
6. 6.True or false: to keep an incubator warm, use a motion sensor. (a) False (b) True
7. 7.True or false: to warn of a gas leak, use a soil moisture sensor. (a) True (b) False
8. 8.Which job needs a sound sensor? (a) make a parking alarm (b) start a fan when hot (c) warn of a gas leak (d) switch on with a clap
9. 9.True or false: to switch on with a clap, use a gas sensor. (a) True (b) False
10. 10.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
12. 12.🔍 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)?
13. 13.True or false: to switch on with a clap, use a rain sensor. (a) False (b) True
14. 14.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a distance sensor (c) a rain sensor (d) a soil moisture sensor
15. 15.Which job needs a pump? (a) show the temperature (b) move water to plants (c) turn to an exact angle (d) beep an alarm
16. 16.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) turn to an exact angle (d) open a gate to 90°
17. 17.🔍 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?
18. 18.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a display (d) a pump
20. 20.Which job needs a distance sensor? (a) warn of a gas leak (b) close a window in rain (c) switch on lamps at dusk (d) make a parking alarm
21. 21.🔍 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)?
22. 22.🔍 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)?
23. 23.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a servo motor (c) a pump (d) a buzzer
24. 24.True or false: to open blinds at sunrise, use a gas sensor. (a) False (b) True
25. 25.Which job needs a gas sensor? (a) start a fan when hot (b) switch on with a clap (c) warn of a gas leak (d) spot someone walking in
26. 26.Which job needs a sound sensor? (a) close a window in rain (b) start a fan when hot (c) warn of a gas leak (d) measure classroom noise
27. 27.Which job needs a temperature sensor? (a) keep an incubator warm (b) water a dry plant (c) stop a robot near walls (d) open blinds at sunrise
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🔍 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?
30. 30.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a distance sensor (c) a gas sensor (d) a rain sensor
31. 31.Which job needs a servo motor? (a) open a gate to 90° (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
32. 32.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a soil moisture sensor (c) a light sensor (d) a motion sensor
33. 33.🔍 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?
34. 34.True or false: to water a dry plant, use a gas sensor. (a) False (b) True
35. 35.Which job needs a buzzer? (a) move water to plants (b) show a status light (c) beep an alarm (d) spin a robot’s wheels
36. 36.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a temperature sensor (c) a rain sensor (d) a distance sensor
37. 37.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a gas sensor (c) a motion sensor (d) a sound sensor
38. 38.Which job needs a rain sensor? (a) close a window in rain (b) measure classroom noise (c) stop a robot near walls (d) water a dry plant
39. 39.Which job needs a soil moisture sensor? (a) switch on with a clap (b) water a dry plant (c) measure classroom noise (d) spot someone walking in
40. 40.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) an LED (c) a pump (d) a motor

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