Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 904 · 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 robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
2. 2.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
3. 3.🔍 Which sensor helps a robot feel a bump into a wall? (a) a temperature sensor (b) a light sensor (c) a touch sensor (d) a sound sensor
4. 4.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
5. 5.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
6. 6.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) far behind it (d) under the right sensor
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.🛞 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
9. 9.🧭 A robot faces north. It does: turn around, turn right, turn left, turn around. Which way does it face now? (a) west (b) north (c) south (d) east
10. 10.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a gyro sensor (c) a camera (d) a temperature sensor
11. 11.🔍 Which sensor helps a robot read a QR code? (a) a temperature sensor (b) a light sensor (c) a camera (d) a sound sensor
12. 12.⚙️ A 40-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
13. 13.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
14. 14.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 352 cm?
15. 15.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 4 (c) 2 (d) 3
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 40. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
19. 19.📡 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)?
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
21. 21.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
22. 22.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 40
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
24. 24.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 45° (d) 180°
25. 25.🧭 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 90°. It turns right 135°, then right 45°. What does the gyro read now (0° to 359°)?
26. 26.Which of these suits tracks? (a) hovering over a roof (b) moving under water (c) a long factory floor (d) a muddy building site
27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
28. 28.🛞 Which way of moving suits this best: “a flat road”? (a) propellers (b) wheels (c) tracks (d) legs
29. 29.🛞 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 2 times. How far does the robot roll (in cm)?
30. 30.📡 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?
31. 31.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
33. 33.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
34. 34.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
35. 35.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
36. 36.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
37. 37.🧭 A robot spins 30° every second. How many seconds does it take to turn 210°?
38. 38.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 23. What is under the sensor? (a) the white floor (b) the black line
39. 39.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
40. 40.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True

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