Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 935 · 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 wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
3. 3.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 44. What is under the sensor? (a) the white floor (b) the black line
4. 4.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a sound sensor (c) a camera (d) a light sensor
5. 5.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) between the two sensors (c) under the left sensor (d) under the right sensor
6. 6.Which of these suits legs? (a) a long factory floor (b) a hospital corridor (c) a field of tall boulders (d) a flat road
7. 7.🦾 A servo program runs:
   angle = 10
   angle = angle + 50
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
8. 8.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 18. What is under the sensor? (a) the black line (b) the white floor
9. 9.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
10. 10.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 36. What is under the sensor? (a) the white floor (b) the black line
11. 11.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) propellers (c) tracks (d) legs
12. 12.🛞 Circumference = π × … (a) weight (b) diameter (c) radius only (d) speed
13. 13.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they are shiny (c) they spin in the air (d) they spread the weight
14. 14.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
15. 15.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
16. 16.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
17. 17.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 47. What is under the sensor? (a) the white floor (b) the black line
18. 18.🔍 Which sensor helps a robot read a QR code? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a light sensor
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points up and left (c) points right (d) points up and right
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
23. 23.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
24. 24.True or false: to stay balanced upright, use a temperature sensor. (a) True (b) False
25. 25.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
26. 26.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.🧭 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 90°. It turns right 135°, then right 180°, then left 45°. What does the gyro read now (0° to 359°)?
29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
30. 30.🛞 Which way of moving suits this best: “a hospital corridor”? (a) wheels (b) propellers (c) tracks (d) legs
31. 31.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) propellers (c) tracks (d) legs
32. 32.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 4 (c) 3 (d) 2
33. 33.Which job needs a sound sensor? (a) follow a black line (b) spot a red ball (c) know a button is pressed (d) start on a hand clap
34. 34.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) legs (c) propellers (d) wheels
35. 35.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
37. 37.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
38. 38.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
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 small driver gear (b) a big driver gear

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