Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 785 · 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.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size
2. 2.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
3. 3.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
4. 4.🧭 A robot spins 15° every second. How many seconds does it take to turn 15°?
5. 5.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
6. 6.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spin in the air (c) they are round (d) they spread the weight
7. 7.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
9. 9.🦾 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 straight up (b) points left (c) points up and left (d) points right
10. 10.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
11. 11.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
12. 12.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) in opposite directions (d) one up, one down
14. 14.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
15. 15.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
16. 16.⚙️ A motor makes 200 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
18. 18.Which job needs a sound sensor? (a) find the brightest spot (b) warn if motors get hot (c) start on a hand clap (d) stay balanced upright
19. 19.📡 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?
20. 20.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) legs (c) wheels (d) propellers
21. 21.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
23. 23.🦾 A servo moves from 160° to 20°. How many degrees does it turn?
24. 24.📡 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?
25. 25.⚙️ A motor makes 330 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
26. 26.🧭 A robot should turn right 180°, but its gyro shows it turned 173°. How many degrees must it turn more to the right?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
28. 28.🛞 Which way of moving suits this best: “soft snow”? (a) legs (b) wheels (c) tracks (d) propellers
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 3 cm (d) 34 cm
31. 31.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
32. 32.⚙️ 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
33. 33.True or false: “a smooth classroom floor” suits legs. (a) True (b) False
34. 34.🧭 A robot faces south. It does: turn left, turn right, turn around, turn right. Which way does it face now? (a) east (b) north (c) west (d) south
35. 35.Which of these suits wheels? (a) a smooth classroom floor (b) a muddy building site (c) flying over a field (d) loose sand dunes
36. 36.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
37. 37.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
38. 38.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.Which of these suits tracks? (a) a muddy building site (b) a long factory floor (c) moving under water (d) hovering over a roof
40. 40.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?

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