Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 1 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) an output (d) a fuse
2. 2.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
3. 3.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a rain sensor (c) a light sensor (d) a motion sensor
4. 4.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
5. 5.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a soil moisture sensor (c) a gas sensor (d) a distance sensor
6. 6.Which job needs a distance sensor? (a) close a window in rain (b) switch on lamps at dusk (c) stop a robot near walls (d) switch on with a clap
7. 7.Which job needs a sound sensor? (a) switch on with a clap (b) open blinds at sunrise (c) water a dry plant (d) start a fan when hot
8. 8.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a light sensor (c) a soil moisture sensor (d) a temperature sensor
9. 9.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
11. 11.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a motion sensor (c) a distance sensor (d) a light sensor
12. 12.🔍 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)?
13. 13.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a motor (d) a servo motor
14. 14.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a buzzer (c) a display (d) an LED
15. 15.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a gas sensor (c) a rain sensor (d) a soil moisture sensor
16. 16.Which job needs a servo motor? (a) move water to plants (b) spin a robot’s wheels (c) show a status light (d) turn to an exact angle
17. 17.True or false: to make a parking alarm, use a light sensor. (a) False (b) True
18. 18.🔍 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?
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a buzzer (c) a servo motor (d) a display
21. 21.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
22. 22.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a display (c) a pump (d) a servo motor
23. 23.Which job needs a pump? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) move water to plants
24. 24.True or false: to start a fan when hot, use a sound sensor. (a) True (b) False
25. 25.Which job needs a soil moisture sensor? (a) water a dry plant (b) switch on lamps at dusk (c) measure classroom noise (d) start a fan when hot
26. 26.Which job needs a sound sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) measure classroom noise (d) keep an incubator warm
27. 27.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
28. 28.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a buzzer (c) a motor (d) a servo motor
29. 29.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a soil moisture sensor (d) a rain sensor
30. 30.Which job needs an LED? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) open a gate to 90°
31. 31.🔍 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?
32. 32.Which job needs a motion sensor? (a) warn of a gas leak (b) start a fan when hot (c) spot someone walking in (d) switch on with a clap
33. 33.🔍 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?
34. 34.🔍 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?
35. 35.⚙️ Which actuator would you use to move water to plants? (a) a display (b) an LED (c) a pump (d) a buzzer
36. 36.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a soil moisture sensor (c) a motion sensor (d) a sound sensor
38. 38.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
39. 39.🔍 An object is 272 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 temperature sensor? (a) water a dry plant (b) keep an incubator warm (c) warn of a gas leak (d) spot someone walking in

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