Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 878 · 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 is 210 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)?
2. 2.Which of these suits legs? (a) crossing stepping-stones (b) a hospital corridor (c) hovering over a roof (d) flying over a field
3. 3.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 90° (d) 360°
4. 4.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
5. 5.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
6. 6.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
7. 7.🦾 A servo program runs:
   angle = 70
   angle = angle − 30
   angle = angle + 40
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
9. 9.Which of these suits legs? (a) a muddy building site (b) stepping over wide gaps (c) a hospital corridor (d) deep mud
10. 10.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
11. 11.📡 A robot is 120 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 4 seconds (in cm)?
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
13. 13.🧭 A robot faces north. It does: turn around, turn right. Which way does it face now? (a) south (b) west (c) east (d) north
14. 14.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
15. 15.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
16. 16.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
17. 17.🧭 How many degrees is a right-angle turn? (a) 45° (b) 360° (c) 180° (d) 90°
18. 18.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
19. 19.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points right (c) points straight up (d) points up and left
20. 20.True or false: “a field of tall boulders” suits wheels. (a) False (b) True
21. 21.🧭 A robot faces west. It does: turn left, turn left, turn right, turn right. Which way does it face now? (a) west (b) south (c) north (d) east
22. 22.🧭 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 45°, then left 180°, then right 135°. What does the gyro read now (0° to 359°)?
23. 23.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.🛞 Which way of moving suits this best: “a flat road”? (a) propellers (b) tracks (c) wheels (d) legs
25. 25.🦾 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 up and right (b) points left (c) points right (d) points up and left
26. 26.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
29. 29.Which job needs a temperature sensor? (a) measure how far a box is (b) hear a whistle (c) stop before a wall (d) warn if motors get hot
30. 30.⚙️ A motor makes 330 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
31. 31.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
33. 33.True or false: to stop before a wall, use a distance sensor. (a) True (b) False
34. 34.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
35. 35.📡 A robot is 260 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)?
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 95. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
37. 37.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
38. 38.True or false: “a long factory floor” suits propellers. (a) True (b) False
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor

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