Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 541 · 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 light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
2. 2.True or false: to spot a red ball, use a camera. (a) False (b) True
3. 3.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
4. 4.🦾 A servo program runs:
   angle = 90
   angle = angle − 60
   angle = angle − 30
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
6. 6.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 3 seconds (in cm)?
7. 7.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
8. 8.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 8. What is under the sensor? (a) the black line (b) the white floor
9. 9.🧭 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 180°. It turns right 120°, then left 120°, then left 135°. What does the gyro read now (0° to 359°)?
10. 10.Which job needs a sound sensor? (a) know a button is pressed (b) start on a hand clap (c) find the brightest spot (d) warn if motors get hot
11. 11.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 66 cm?
12. 12.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
14. 14.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) spins right on the spot (b) turns right (c) turns left (d) goes straight back
15. 15.📡 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)?
16. 16.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
17. 17.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
18. 18.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the wheel size (d) the top speed
21. 21.Which of these suits tracks? (a) hovering over a roof (b) a field of tall boulders (c) deep mud (d) a long factory floor
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.Which job needs a touch sensor? (a) hear a whistle (b) feel a bump into a wall (c) measure how far a box is (d) stay balanced upright
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 95. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
25. 25.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.📡 A robot is 190 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 12 seconds (in cm)?
28. 28.True or false: to feel a bump into a wall, use a sound sensor. (a) True (b) False
29. 29.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
30. 30.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
31. 31.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
32. 32.🧭 A robot should turn right 45°, but its gyro shows it turned 41°. How many degrees must it turn more to the right?
33. 33.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is loud (d) black is hot
36. 36.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
37. 37.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
38. 38.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it stops for ever (d) it jumps
39. 39.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
40. 40.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size

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