Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 8 · 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.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
2. 2.Which of these suits propellers? (a) a long factory floor (b) loose sand dunes (c) hovering over a roof (d) a flat road
3. 3.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) propellers (c) wheels (d) tracks
4. 4.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
6. 6.True or false: “a smooth classroom floor” suits tracks. (a) False (b) True
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 90. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
8. 8.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) sound is slow (d) it goes there and back
9. 9.🦾 A servo program runs:
   angle = 150
   angle = angle − 40
   angle = angle − 30
   angle = angle − 30
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
11. 11.Which of these suits wheels? (a) hovering over a roof (b) loose sand dunes (c) a long factory floor (d) a field of tall boulders
12. 12.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
14. 14.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
15. 15.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
16. 16.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
17. 17.🛞 Circumference = π × … (a) weight (b) radius only (c) speed (d) diameter
18. 18.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) black (d) white
20. 20.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.⚙️ A 12-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
22. 22.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 12. What is under the sensor? (a) the black line (b) the white floor
23. 23.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
24. 24.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
25. 25.Which of these suits tracks? (a) loose sand dunes (b) a field of tall boulders (c) crossing stepping-stones (d) a hospital corridor
26. 26.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
28. 28.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
29. 29.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
30. 30.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) an output (d) a wheel
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.⚙️ 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
33. 33.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
37. 37.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
39. 39.📡 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)?
40. 40.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 60. What is under the sensor? (a) the white floor (b) the black line

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