Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 237 · 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.⚙️ An 8-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
2. 2.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
4. 4.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
6. 6.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) tracks (c) propellers (d) legs
7. 7.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) under the left sensor (d) between the two sensors
8. 8.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.Which of these suits wheels? (a) a muddy building site (b) deep mud (c) a hospital corridor (d) loose sand dunes
10. 10.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.True or false: to stop before a wall, use a distance sensor. (a) False (b) True
12. 12.True or false: “flying over a field” suits propellers. (a) False (b) True
13. 13.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
15. 15.True or false: “a flat road” suits legs. (a) True (b) False
16. 16.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
17. 17.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
18. 18.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
19. 19.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 7/22 (c) 2/7 (d) 22
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
22. 22.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) tyre (d) driver gear
23. 23.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle + 20
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
25. 25.🧭 A robot should turn right 45°, but its gyro shows it turned 35°. How many degrees must it turn more to the right?
26. 26.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 41. What is under the sensor? (a) the white floor (b) the black line
27. 27.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
29. 29.🧭 A robot should turn right 90°, but its gyro shows it turned 80°. How many degrees must it turn more to the right?
30. 30.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
31. 31.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
32. 32.🦾 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 up and left (c) points right (d) points up and right
33. 33.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a flat wall (d) a soft foam cushion
34. 34.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
35. 35.🔍 Which sensor helps a robot warn if motors get hot? (a) a distance sensor (b) a camera (c) a light sensor (d) a temperature sensor
36. 36.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
37. 37.Which of these suits propellers? (a) deep mud (b) a smooth classroom floor (c) moving under water (d) a muddy building site
38. 38.🧭 A robot spins 15° every second. How many seconds does it take to turn 315°?
39. 39.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
40. 40.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False

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