Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 277 · 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 program runs:
   angle = 0
   angle = angle + 30
   angle = angle + 10
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
3. 3.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) propellers (c) wheels (d) legs
4. 4.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) legs (c) wheels (d) propellers
5. 5.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
6. 6.🦾 A servo program runs:
   angle = 110
   angle = angle − 30
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
9. 9.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
10. 10.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) hear claps (d) turn by exact angles
11. 11.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 85. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
12. 12.🛞 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)?
13. 13.True or false: “soft snow” suits tracks. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
15. 15.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
17. 17.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 180° (d) 45°
18. 18.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) turns left (b) stays still (c) turns right (d) spins left on the spot
19. 19.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
20. 20.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
21. 21.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
22. 22.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
23. 23.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they are too cheap (d) they never tire
24. 24.⚙️ A 10-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
25. 25.⚙️ 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
26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
27. 27.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 56. What is under the sensor? (a) the white floor (b) the black line
28. 28.Which job needs a touch sensor? (a) measure a turn angle (b) read a QR code (c) feel a bump into a wall (d) stop before a wall
29. 29.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.🧭 A robot spins 15° every second. How many seconds does it take to turn 45°?
32. 32.🔍 Which sensor helps a robot measure how far a box is? (a) a gyro sensor (b) a sound sensor (c) a temperature sensor (d) a distance sensor
33. 33.True or false: “a long factory floor” suits tracks. (a) True (b) False
34. 34.🧭 A robot faces south. It does: turn around, turn right. Which way does it face now? (a) west (b) east (c) south (d) north
35. 35.True or false: to read a QR code, use a touch sensor. (a) True (b) False
36. 36.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 85. What is under the sensor? (a) the black line (b) the white floor
37. 37.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
38. 38.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left 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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