Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 664 · 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.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
2. 2.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
4. 4.🧭 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 180°, then right 120°. What does the gyro read now (0° to 359°)?
5. 5.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) goes straight back (b) goes straight forward (c) turns left (d) spins right on the spot
6. 6.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
7. 7.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) in opposite directions (c) the same direction (d) they do not turn
8. 8.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) tracks (c) wheels (d) propellers
9. 9.📡 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?
10. 10.🔍 Which sensor helps a robot measure how far a box is? (a) a light sensor (b) a camera (c) a distance sensor (d) a sound sensor
11. 11.Which job needs a camera? (a) stay balanced upright (b) feel a bump into a wall (c) spot a red ball (d) follow a black line
12. 12.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
13. 13.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
15. 15.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a light sensor (c) a touch sensor (d) a distance sensor
16. 16.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black soaks up light (d) black is hot
17. 17.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 19. What is under the sensor? (a) the black line (b) the white floor
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
21. 21.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are round (c) they spread the weight (d) they are shiny
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
24. 24.🦾 A servo moves from 50° to 130°. How many degrees does it turn?
25. 25.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
26. 26.True or false: to read a QR code, use a sound sensor. (a) False (b) True
27. 27.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
28. 28.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) between the two sensors (c) under the right sensor (d) under the left sensor
29. 29.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
30. 30.True or false: “moving under water” suits wheels. (a) False (b) True
31. 31.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
32. 32.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 50
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.True or false: to measure how far a box is, use a sound sensor. (a) False (b) True
35. 35.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
36. 36.🧭 A robot faces east. It does: turn right, turn around, turn left, turn around. Which way does it face now? (a) west (b) north (c) south (d) east
37. 37.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
38. 38.🧭 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 0°. It turns left 180°, then right 135°. What does the gyro read now (0° to 359°)?
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors

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