Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 190 · 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 pump? (a) show the temperature (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
2. 2.Which job needs a gas sensor? (a) close a window in rain (b) measure classroom noise (c) open blinds at sunrise (d) warn of a gas leak
3. 3.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) a servo motor (d) a display
4. 4.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
5. 5.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a distance sensor (c) a rain sensor (d) a sound sensor
6. 6.Which job needs a motor? (a) open a gate to 90° (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
7. 7.Which job needs a temperature sensor? (a) stop a robot near walls (b) switch on with a clap (c) start a fan when hot (d) close a window in rain
8. 8.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.Which job needs a temperature sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) make a parking alarm (d) water a dry plant
10. 10.Which job needs an LED? (a) turn to an exact angle (b) beep an alarm (c) show a status light (d) move water to plants
11. 11.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a gas sensor
12. 12.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a motor (c) a display (d) a servo motor
13. 13.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
14. 14.Which job needs a rain sensor? (a) warn of a gas leak (b) stop a robot near walls (c) measure classroom noise (d) close a window in rain
15. 15.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
16. 16.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a soil moisture sensor (c) a gas sensor (d) a motion sensor
17. 17.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
18. 18.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
19. 19.Which job needs a soil moisture sensor? (a) spot someone walking in (b) water a dry plant (c) start a fan when hot (d) make a parking alarm
20. 20.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) True (b) False
21. 21.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
22. 22.Which job needs a light sensor? (a) water a dry plant (b) keep an incubator warm (c) open blinds at sunrise (d) warn of a gas leak
23. 23.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a distance sensor (c) a soil moisture sensor (d) a motion sensor
24. 24.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
25. 25.True or false: to open blinds at sunrise, use a gas sensor. (a) False (b) True
26. 26.True or false: to switch on lamps at dusk, use a temperature sensor. (a) False (b) True
27. 27.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
28. 28.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a buzzer (c) an LED (d) a display
29. 29.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
30. 30.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a rain sensor (c) a gas sensor (d) a sound sensor
31. 31.Which job needs a buzzer? (a) open a gate to 90° (b) turn to an exact angle (c) spin a robot’s wheels (d) beep an alarm
32. 32.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a motor (c) a servo motor (d) a pump
33. 33.⚙️ Which actuator would you use to show a status light? (a) a display (b) a motor (c) a pump (d) an LED
34. 34.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a servo motor (c) a buzzer (d) a display
35. 35.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
36. 36.Which job needs a servo motor? (a) spin a robot’s wheels (b) show the temperature (c) turn to an exact angle (d) move water to plants
37. 37.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a display (c) a motor (d) a pump
38. 38.🔍 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)?
39. 39.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a soil moisture sensor (c) a distance sensor (d) a sound sensor
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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