Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 842 · 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 below 40 over a black line and above 40 over the white floor. It reads 20. What is under the sensor? (a) the white floor (b) the black line
2. 2.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
3. 3.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 90° (d) 360°
4. 4.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
5. 5.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it stops for ever (d) it uses a sail
6. 6.🦾 A servo moves from 0° to 120°. How many degrees does it turn?
7. 7.🧭 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 0°. It turns left 45°, then left 120°. What does the gyro read now (0° to 359°)?
8. 8.📡 A robot is 180 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 10 seconds (in cm)?
9. 9.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
10. 10.🦾 A servo moves from 60° to 150°. How many degrees does it turn?
11. 11.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a gear (c) a caster wheel (d) a track
12. 12.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
13. 13.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
15. 15.🧭 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 left 60°, then left 135°, then right 30°. What does the gyro read now (0° to 359°)?
16. 16.🦾 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 right (b) points left (c) points right (d) points straight up
17. 17.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
18. 18.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a camera (c) a sound sensor (d) a gyro sensor
19. 19.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points right (c) points straight up (d) points up and right
20. 20.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 5. What is under the sensor? (a) the black line (b) the white floor
21. 21.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
22. 22.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
23. 23.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22 (d) 22/7
24. 24.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
25. 25.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a sound sensor (c) a distance sensor (d) a touch sensor
26. 26.True or false: to feel a bump into a wall, use a camera. (a) True (b) False
27. 27.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) spokes (d) teeth
28. 28.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo moves from 110° to 20°. How many degrees does it turn?
30. 30.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
31. 31.⚙️ A 16-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
32. 32.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
33. 33.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
35. 35.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) propellers (c) wheels (d) legs
36. 36.📡 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?
37. 37.📡 A robot is 210 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 4 seconds (in cm)?
38. 38.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
39. 39.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
40. 40.⚙️ 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 big driver gear (b) a small driver gear

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