Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 802 · 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 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) legs (c) propellers (d) tracks
3. 3.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
4. 4.🧭 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 right 120°, then left 135°. What does the gyro read now (0° to 359°)?
5. 5.⚙️ A 30-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
6. 6.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
7. 7.Which of these suits wheels? (a) soft snow (b) hovering over a roof (c) a field of tall boulders (d) a flat road
8. 8.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
11. 11.True or false: to measure how far a box is, use a camera. (a) True (b) False
12. 12.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
13. 13.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
15. 15.🔍 Which sensor helps a robot spot a red ball? (a) a gyro sensor (b) a touch sensor (c) a camera (d) a sound sensor
16. 16.Which of these suits tracks? (a) a long factory floor (b) a hospital corridor (c) hovering over a roof (d) deep mud
17. 17.Which job needs a distance sensor? (a) find the brightest spot (b) know a button is pressed (c) stop before a wall (d) measure a turn angle
18. 18.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
19. 19.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
20. 20.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
22. 22.Which of these suits wheels? (a) hovering over a roof (b) moving under water (c) a long factory floor (d) flying over a field
23. 23.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a touch sensor (c) a camera (d) a distance sensor
24. 24.🧭 A robot spins 15° every second. How many seconds does it take to turn 75°?
25. 25.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster and weaker
26. 26.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
27. 27.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
28. 28.Which of these suits legs? (a) moving under water (b) soft snow (c) a muddy building site (d) a field of tall boulders
29. 29.True or false: to feel a bump into a wall, use a camera. (a) True (b) False
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
31. 31.🛞 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 forward. What does the robot do? (a) turns right (b) goes straight back (c) goes straight forward (d) spins right on the spot
32. 32.🧭 A robot faces north. It does: turn around, turn right, turn right, turn left. Which way does it face now? (a) north (b) west (c) south (d) east
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
34. 34.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
35. 35.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 2/7 (d) 22/7
36. 36.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
37. 37.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
38. 38.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.⚙️ 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

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