Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 751 · 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.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) the sensor is half (d) sound is slow
2. 2.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
4. 4.📡 A robot is 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 16 seconds (in cm)?
5. 5.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
6. 6.📡 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?
7. 7.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) one up, one down (d) in opposite directions
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 20. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
9. 9.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
10. 10.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
11. 11.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 180° (d) 360°
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
15. 15.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) goes straight back (b) stays still (c) turns left (d) spins right on the spot
16. 16.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
18. 18.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 60. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
20. 20.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) propellers (c) tracks (d) legs
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🔍 Which sensor helps a robot hear a whistle? (a) a touch sensor (b) a sound sensor (c) a camera (d) a light sensor
23. 23.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 25. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
26. 26.Which of these suits legs? (a) a long factory floor (b) moving under water (c) stepping over wide gaps (d) loose sand dunes
27. 27.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
28. 28.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
29. 29.🛞 Circumference = π × … (a) radius only (b) speed (c) diameter (d) weight
30. 30.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a servo (d) a gear
31. 31.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 28 times. How many times does the driven gear turn?
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
33. 33.🧭 A robot faces north. It does: turn right, turn right, turn right, turn right. Which way does it face now? (a) east (b) north (c) south (d) west
34. 34.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
35. 35.🦾 A servo moves from 80° to 100°. How many degrees does it turn?
36. 36.📡 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?
37. 37.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
38. 38.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
40. 40.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?

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