Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 779 · 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.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 22/7 (d) 2/7
2. 2.Which of these suits legs? (a) flying over a field (b) crossing stepping-stones (c) hovering over a roof (d) loose sand dunes
3. 3.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 41. What is under the sensor? (a) the white floor (b) the black line
7. 7.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
8. 8.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) spins right on the spot (b) turns left (c) turns right (d) goes straight back
9. 9.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
10. 10.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
11. 11.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight back (b) turns left (c) stays still (d) goes straight forward
12. 12.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
13. 13.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 37. What is under the sensor? (a) the black line (b) the white floor
14. 14.📡 A robot is 160 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 25 seconds (in cm)?
15. 15.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
16. 16.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) tracks (c) wheels (d) propellers
17. 17.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
18. 18.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) in opposite directions (d) one up, one down
19. 19.🧭 A robot should turn right 45°, but its gyro shows it turned 60°. How many degrees must it turn back to the left?
20. 20.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
21. 21.🛞 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) turns right (b) goes straight forward (c) turns left (d) spins left on the spot
22. 22.Which of these suits propellers? (a) crossing stepping-stones (b) hovering over a roof (c) a long factory floor (d) a field of tall boulders
23. 23.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
24. 24.🧭 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 left 90°, then right 90°, then left 60°. What does the gyro read now (0° to 359°)?
25. 25.📡 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
26. 26.🧭 A robot faces east. It does: turn right, turn left. Which way does it face now? (a) west (b) south (c) east (d) north
27. 27.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
28. 28.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
29. 29.Which of these suits wheels? (a) stepping over wide gaps (b) a long factory floor (c) deep mud (d) a muddy building site
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.⬛ The threshold of a light sensor is … (a) the top speed (b) the black/white cut-off (c) the battery size (d) the wheel size
32. 32.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a gyro sensor (c) a sound sensor (d) a camera
33. 33.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) propellers (c) wheels (d) legs
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 10. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
35. 35.🧭 A robot faces west. It does: turn left, turn left, turn right. Which way does it face now? (a) north (b) west (c) south (d) east
36. 36.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
37. 37.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.Which of these suits legs? (a) a long factory floor (b) flying over a field (c) a smooth classroom floor (d) a field of tall boulders
39. 39.🔍 Which sensor helps a robot stay balanced upright? (a) a sound sensor (b) a temperature sensor (c) a gyro sensor (d) a distance sensor
40. 40.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) propellers (c) legs (d) wheels

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