Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 85 · 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 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 180°, then right 45°. What does the gyro read now (0° to 359°)?
2. 2.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 360° (d) 90°
3. 3.📡 A robot is 240 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 12 seconds (in cm)?
4. 4.True or false: “crossing stepping-stones” suits legs. (a) False (b) True
5. 5.📡 A robot is 180 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 14 seconds (in cm)?
6. 6.🛞 Which way of moving suits this best: “hovering over a roof”? (a) wheels (b) tracks (c) propellers (d) legs
7. 7.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black is hot (d) black soaks up light
8. 8.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
9. 9.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 34. What is under the sensor? (a) the white floor (b) the black line
10. 10.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
11. 11.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) spins right on the spot (b) spins left on the spot (c) turns right (d) turns left
12. 12.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times slower (d) 3 times bigger
13. 13.🧭 A robot faces north. It does: turn right, turn left, turn around, turn around. Which way does it face now? (a) south (b) east (c) west (d) north
14. 14.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.📡 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 11 seconds (in cm)?
17. 17.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
18. 18.🧭 A robot spins 15° every second. How many seconds does it take to turn 15°?
19. 19.📡 A robot is 250 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 4 seconds (in cm)?
20. 20.⚙️ A motor makes 120 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
21. 21.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they spin in the air (d) they are round
22. 22.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
23. 23.True or false: “stepping over wide gaps” suits tracks. (a) False (b) True
24. 24.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.📡 A robot is 200 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 9 seconds (in cm)?
27. 27.🧭 A robot faces north. It does: turn left, turn around. Which way does it face now? (a) south (b) west (c) east (d) north
28. 28.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) a wheel (d) an output
29. 29.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 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
31. 31.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) under the right sensor (c) far behind it (d) between the two sensors
32. 32.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) goes straight back (b) stays still (c) turns right (d) spins right on the spot
33. 33.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 40. What is under the sensor? (a) the white floor (b) the black line
34. 34.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
35. 35.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
36. 36.⬛ The threshold of a light sensor is … (a) the battery size (b) the wheel size (c) the top speed (d) the black/white cut-off
37. 37.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
38. 38.🔍 Which sensor helps a robot find the brightest spot? (a) a gyro sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
39. 39.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.True or false: to warn if motors get hot, use a temperature sensor. (a) True (b) False

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