Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 432 · 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.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) motor volts (d) number of gears
2. 2.🛞 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)?
3. 3.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
4. 4.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
5. 5.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the wheel size (c) the battery size (d) the top speed
6. 6.True or false: “deep mud” suits wheels. (a) True (b) False
7. 7.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.🧭 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 270°. It turns right 30°, then left 90°. What does the gyro read now (0° to 359°)?
9. 9.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) too fast on floors (c) they are too cheap (d) they never tire
10. 10.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 28. What is under the sensor? (a) the white floor (b) the black line
11. 11.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
13. 13.True or false: “hovering over a roof” suits tracks. (a) True (b) False
14. 14.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
15. 15.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
16. 16.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
17. 17.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
18. 18.True or false: “loose sand dunes” suits legs. (a) False (b) True
19. 19.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
20. 20.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
21. 21.Which of these suits tracks? (a) a long factory floor (b) stepping over wide gaps (c) loose sand dunes (d) crossing stepping-stones
22. 22.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
23. 23.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and left (b) points straight up (c) points up and right (d) points right
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
25. 25.📡 Why do we halve the echo’s total path? (a) sound is slow (b) it goes there and back (c) the sensor is half (d) to make it smaller
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.Which of these suits propellers? (a) crossing stepping-stones (b) loose sand dunes (c) a smooth classroom floor (d) hovering over a roof
28. 28.⚙️ A 16-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
29. 29.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) black (d) the sky
32. 32.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
34. 34.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
35. 35.📡 A robot is 230 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)?
36. 36.🛞 Which way of moving suits this best: “soft snow”? (a) wheels (b) tracks (c) legs (d) propellers
37. 37.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) propellers (b) legs (c) tracks (d) wheels
38. 38.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
39. 39.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
40. 40.⚙️ An 8-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower

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