Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 83 · 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 make a parking alarm? (a) a soil moisture sensor (b) a temperature sensor (c) a distance sensor (d) a motion sensor
2. 2.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
3. 3.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
4. 4.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
5. 5.Which job needs a display? (a) beep an alarm (b) turn to an exact angle (c) move water to plants (d) show the temperature
6. 6.Which job needs a light sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) switch on with a clap (d) spot someone walking in
7. 7.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
8. 8.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a light sensor (c) a motion sensor (d) a soil moisture sensor
9. 9.Which job needs a rain sensor? (a) keep an incubator warm (b) measure classroom noise (c) spot someone walking in (d) close a window in rain
10. 10.True or false: to stop a robot near walls, use a motion sensor. (a) True (b) False
11. 11.🔍 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
12. 12.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
13. 13.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a display (c) a pump (d) a servo motor
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
15. 15.Which job needs a temperature sensor? (a) stop a robot near walls (b) spot someone walking in (c) close a window in rain (d) keep an incubator warm
16. 16.Which job needs a motion sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) spot someone walking in (d) warn of a gas leak
17. 17.Which job needs a distance sensor? (a) close a window in rain (b) stop a robot near walls (c) open blinds at sunrise (d) switch on lamps at dusk
18. 18.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a pump (c) an LED (d) a motor
19. 19.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
20. 20.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
22. 22.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
23. 23.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
24. 24.🔍 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?
25. 25.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False
26. 26.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a rain sensor (c) a temperature sensor (d) a sound sensor
27. 27.Which job needs a sound sensor? (a) warn of a gas leak (b) close a window in rain (c) start a fan when hot (d) switch on with a clap
28. 28.True or false: to start a fan when hot, use a soil moisture sensor. (a) False (b) True
29. 29.Which job needs a light sensor? (a) start a fan when hot (b) warn of a gas leak (c) open blinds at sunrise (d) water a dry plant
30. 30.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a display (c) a servo motor (d) a motor
31. 31.True or false: to close a window in rain, use a motion sensor. (a) True (b) False
32. 32.Which job needs a motor? (a) beep an alarm (b) move water to plants (c) open a gate to 90° (d) spin a robot’s wheels
33. 33.True or false: to spot someone walking in, use a light sensor. (a) False (b) True
34. 34.Which job needs a pump? (a) open a gate to 90° (b) show a status light (c) beep an alarm (d) move water to plants
35. 35.🔍 Which sensor would you use to water a dry plant? (a) a temperature sensor (b) a sound sensor (c) a soil moisture sensor (d) a motion sensor
36. 36.True or false: to keep an incubator warm, use a soil moisture sensor. (a) False (b) True
37. 37.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a soil moisture sensor (c) a temperature sensor (d) a light sensor
38. 38.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
39. 39.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a light sensor
40. 40.Which job needs a servo motor? (a) move water to plants (b) open a gate to 90° (c) spin a robot’s wheels (d) show the temperature

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