Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 419 · 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.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) the same direction (d) they do not turn
2. 2.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
4. 4.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points right (b) points straight up (c) points up and right (d) points left
5. 5.🦾 A servo program runs:
   angle = 140
   angle = angle − 50
   angle = angle − 50
   angle = angle + 60
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
7. 7.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
8. 8.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) turns left (b) spins left on the spot (c) turns right (d) stays still
9. 9.⬛ 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 wet (d) black is hot
10. 10.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) the sensor is half (d) sound is slow
11. 11.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
12. 12.True or false: “loose sand dunes” suits tracks. (a) True (b) False
13. 13.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
14. 14.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) wheels (b) tracks (c) propellers (d) legs
15. 15.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
16. 16.True or false: to feel a bump into a wall, use a gyro sensor. (a) False (b) True
17. 17.⚙️ A motor makes 60 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
18. 18.Which job needs a gyro sensor? (a) start on a hand clap (b) read a QR code (c) measure a turn angle (d) warn if motors get hot
19. 19.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
20. 20.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🧭 A robot spins 30° every second. How many seconds does it take to turn 210°?
23. 23.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) south (b) north (c) east (d) west
24. 24.🧭 A robot spins 45° every second. How many seconds does it take to turn 270°?
25. 25.Which job needs a sound sensor? (a) feel a bump into a wall (b) find the brightest spot (c) hear a whistle (d) warn if motors get hot
26. 26.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.🛞 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)?
29. 29.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
31. 31.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
32. 32.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) radio music (d) sound too high to hear
33. 33.Which of these suits legs? (a) flying over a field (b) a long factory floor (c) crossing stepping-stones (d) moving under water
34. 34.📡 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)?
35. 35.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.🧭 A robot spins 15° every second. How many seconds does it take to turn 105°?
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
40. 40.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?

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