Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 261 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
3. 3.Which of these suits propellers? (a) a smooth classroom floor (b) soft snow (c) a hospital corridor (d) flying over a field
4. 4.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
5. 5.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
6. 6.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) a wheel (d) an input
7. 7.🦾 A servo program runs:
   angle = 20
   angle = angle − 20
   angle = angle + 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
11. 11.🧭 A robot should turn right 45°, but its gyro shows it turned 51°. How many degrees must it turn back to the left?
12. 12.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
13. 13.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
15. 15.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
16. 16.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) temperature (d) turning (rotation)
17. 17.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the right sensor (d) under the left sensor
18. 18.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
19. 19.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 1 (d) 2
20. 20.📡 A robot is 200 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
22. 22.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 70. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
23. 23.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.Which job needs a light sensor? (a) know a button is pressed (b) feel a bump into a wall (c) follow a black line (d) hear a whistle
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
26. 26.True or false: to stay balanced upright, use a distance sensor. (a) False (b) True
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
28. 28.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) the same direction (d) in opposite directions
29. 29.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
30. 30.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
31. 31.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) legs (c) tracks (d) propellers
32. 32.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
33. 33.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.⚙️ A motor makes 360 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
36. 36.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
37. 37.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
38. 38.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
39. 39.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
40. 40.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True

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