Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 705 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.📡 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)?
2. 2.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 34 cm (d) 3 cm
3. 3.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an input (c) a gear (d) an output
4. 4.🛞 Which way of moving suits this best: “flying over a field”? (a) propellers (b) wheels (c) legs (d) tracks
5. 5.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 47. What is under the sensor? (a) the white floor (b) the black line
6. 6.🦾 A servo moves from 70° to 120°. How many degrees does it turn?
7. 7.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 616 cm?
8. 8.⚙️ A motor makes 330 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
9. 9.🔍 Why do robots need sensors? (a) to look colourful (b) to use more power (c) to know their world (d) to be heavier
10. 10.🔍 Which sensor helps a robot warn if motors get hot? (a) a sound sensor (b) a temperature sensor (c) a touch sensor (d) a gyro sensor
11. 11.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns left 120°, then left 30°, then right 45°. What does the gyro read now (0° to 359°)?
12. 12.Which job needs a temperature sensor? (a) stop before a wall (b) follow a black line (c) start on a hand clap (d) warn if motors get hot
13. 13.True or false: “hovering over a roof” suits propellers. (a) True (b) False
14. 14.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
15. 15.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
17. 17.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
18. 18.Which of these suits tracks? (a) a hospital corridor (b) loose sand dunes (c) stepping over wide gaps (d) moving under water
19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
20. 20.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a camera (c) a distance sensor (d) a gyro sensor
21. 21.⚙️ A 16-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
22. 22.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
23. 23.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
24. 24.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
25. 25.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) legs (c) tracks (d) propellers
26. 26.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a servo (c) a gear (d) a caster wheel
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
28. 28.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the wheel size (c) the battery size (d) the top speed
29. 29.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.True or false: to stop before a wall, use a light sensor. (a) False (b) True
31. 31.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 90°. It turns right 30°, then right 60°. What does the gyro read now (0° to 359°)?
32. 32.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22 (d) 22/7
33. 33.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) one up, one down (d) they do not turn
34. 34.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
36. 36.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black soaks up light (c) black is hot (d) black is wet
37. 37.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
39. 39.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 90°. It turns right 180°, then right 60°, then right 45°. What does the gyro read now (0° to 359°)?

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