Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 215 · 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 servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and left (b) points left (c) points straight up (d) points right
2. 2.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a light sensor (c) a temperature sensor (d) a gyro sensor
3. 3.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
6. 6.Which of these suits wheels? (a) deep mud (b) soft snow (c) loose sand dunes (d) a flat road
7. 7.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
8. 8.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
9. 9.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a touch sensor (c) a gyro sensor (d) a sound sensor
10. 10.🧭 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 270°. It turns right 60°, then left 45°, then right 180°. What does the gyro read now (0° to 359°)?
11. 11.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its radius (c) its weight (d) its diameter
12. 12.True or false: to read a QR code, use a light sensor. (a) True (b) False
13. 13.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
14. 14.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
15. 15.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) water (d) white
16. 16.🔍 Which sensor helps a robot measure how far a box is? (a) a distance sensor (b) a gyro sensor (c) a touch sensor (d) a temperature sensor
17. 17.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
18. 18.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 7 seconds (in cm)?
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
20. 20.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
21. 21.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) legs (c) tracks (d) wheels
23. 23.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
26. 26.Which of these suits tracks? (a) loose sand dunes (b) flying over a field (c) crossing stepping-stones (d) a field of tall boulders
27. 27.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 3 (c) 1 (d) 4
28. 28.🦾 A servo program runs:
    angle = 100
    angle = angle + 60
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “crossing stepping-stones” suits tracks. (a) False (b) True
30. 30.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.🧭 A robot faces east. It does: turn left, turn left. Which way does it face now? (a) east (b) south (c) west (d) north
32. 32.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
34. 34.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 33. What is under the sensor? (a) the black line (b) the white floor
35. 35.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) wheels (c) tracks (d) legs
36. 36.Which of these suits wheels? (a) loose sand dunes (b) a hospital corridor (c) moving under water (d) a muddy building site
37. 37.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 32. What is under the sensor? (a) the white floor (b) the black line
38. 38.📡 A robot is 130 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 6 seconds (in cm)?
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =

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