Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 26 · 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.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
2. 2.🧭 How many degrees is a full turn? (a) 360° (b) 90° (c) 100° (d) 180°
3. 3.Which of these suits tracks? (a) soft snow (b) a smooth classroom floor (c) a field of tall boulders (d) flying over a field
4. 4.⚙️ A motor makes 40 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
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 3 times (in cm)?
6. 6.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 35. What is under the sensor? (a) the white floor (b) the black line
7. 7.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
8. 8.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) wheels (c) legs (d) tracks
10. 10.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a white surface (d) a black surface
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
12. 12.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
13. 13.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.🦾 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 up and left (b) points up and right (c) points straight up (d) points right
15. 15.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a distance sensor (c) a touch sensor (d) a sound sensor
16. 16.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
17. 17.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
19. 19.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
21. 21.📡 A robot is 100 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 2 seconds (in cm)?
22. 22.🦾 A servo moves from 100° to 60°. How many degrees does it turn?
23. 23.⚙️ A motor makes 100 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
24. 24.🛞 Which way of moving suits this best: “a hospital corridor”? (a) wheels (b) legs (c) propellers (d) tracks
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 49. What is under the sensor? (a) the black line (b) the white floor
26. 26.🦾 A servo moves from 100° to 40°. How many degrees does it turn?
27. 27.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) teeth (d) spokes
28. 28.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
29. 29.🔍 What does a gyro sensor measure? (a) colour (b) turning (rotation) (c) temperature (d) sound
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
31. 31.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
32. 32.⚙️ A 30-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
34. 34.⚙️ A motor makes 320 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
35. 35.Which of these suits tracks? (a) a field of tall boulders (b) crossing stepping-stones (c) a muddy building site (d) moving under water
36. 36.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
37. 37.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a light sensor (c) a touch sensor (d) a gyro sensor
38. 38.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 25. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
40. 40.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small

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