Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 253 · 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 robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
2. 2.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
4. 4.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) sound too high to hear (d) radio music
6. 6.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
8. 8.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 5 seconds (in cm)?
9. 9.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
10. 10.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
11. 11.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black soaks up light (d) black is wet
12. 12.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 32. What is under the sensor? (a) the black line (b) the white floor
13. 13.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) the same direction (d) one up, one down
14. 14.Which of these suits legs? (a) soft snow (b) a hospital corridor (c) a flat road (d) stepping over wide gaps
15. 15.🛞 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) goes straight back (b) spins right on the spot (c) turns right (d) stays still
16. 16.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 45° (d) 180°
17. 17.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
18. 18.Which of these suits tracks? (a) a long factory floor (b) a hospital corridor (c) loose sand dunes (d) a smooth classroom floor
19. 19.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 36. What is under the sensor? (a) the white floor (b) the black line
20. 20.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22 (c) 22/7 (d) 7/22
21. 21.🧭 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 left 120°, then right 30°, then right 120°. What does the gyro read now (0° to 359°)?
22. 22.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
23. 23.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
24. 24.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points straight up (c) points right (d) points up and left
25. 25.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
26. 26.📡 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?
27. 27.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: to follow a black line, use a light sensor. (a) False (b) True
30. 30.Which job needs a camera? (a) stop before a wall (b) read a QR code (c) stay balanced upright (d) measure a turn angle
31. 31.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) under the left sensor (c) between the two sensors (d) far behind it
32. 32.Which job needs a light sensor? (a) follow a black line (b) stay balanced upright (c) read a QR code (d) measure how far a box is
33. 33.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
34. 34.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 40
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
37. 37.🧭 A robot spins 15° every second. How many seconds does it take to turn 90°?
38. 38.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
39. 39.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
40. 40.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?

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