Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 44 · 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.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the right sensor (c) between the two sensors (d) under the left sensor
2. 2.True or false: “deep mud” suits wheels. (a) False (b) True
3. 3.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
4. 4.Which job needs a gyro sensor? (a) find the brightest spot (b) know a button is pressed (c) stay balanced upright (d) hear a whistle
5. 5.🦾 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 straight up (b) points left (c) points right (d) points up and right
6. 6.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
7. 7.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a gear (d) a wheel
9. 9.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) driver gear (d) tyre
11. 11.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 24. What is under the sensor? (a) the white floor (b) the black line
16. 16.🧭 A robot spins 45° every second. How many seconds does it take to turn 270°?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.🧭 A robot should turn right 180°, but its gyro shows it turned 181°. How many degrees must it turn back to the left?
19. 19.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
20. 20.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.🔍 Which sensor helps a robot spot a red ball? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a camera
23. 23.⚙️ A motor makes 20 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
24. 24.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 21. What is under the sensor? (a) the white floor (b) the black line
25. 25.Which job needs a touch sensor? (a) feel a bump into a wall (b) start on a hand clap (c) find the brightest spot (d) stay balanced upright
26. 26.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
28. 28.🔍 Why do robots need sensors? (a) to be heavier (b) to look colourful (c) to know their world (d) to use more power
29. 29.🔦 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) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
30. 30.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
31. 31.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
32. 32.📡 A robot is 200 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 6 seconds (in cm)?
33. 33.True or false: “a long factory floor” suits wheels. (a) True (b) False
34. 34.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 28 times. How many times does the driven gear turn?
36. 36.Which of these suits wheels? (a) flying over a field (b) a long factory floor (c) a field of tall boulders (d) loose sand dunes
37. 37.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times bigger (d) 3 times faster
38. 38.🧭 A robot spins 15° every second. How many seconds does it take to turn 225°?
39. 39.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🧭 A robot should turn right 45°, but its gyro shows it turned 39°. How many degrees must it turn more to the right?

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