Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 28 · 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.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
2. 2.🧭 A robot faces south. It does: turn around, turn left. Which way does it face now? (a) east (b) north (c) south (d) west
3. 3.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
4. 4.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
5. 5.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
6. 6.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) water (d) white
7. 7.⚙️ A motor makes 500 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
8. 8.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
9. 9.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) tracks (c) wheels (d) legs
10. 10.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
11. 11.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a sound sensor (c) a gyro sensor (d) a touch sensor
12. 12.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.🧭 A robot faces north. It does: turn left, turn left, turn right. Which way does it face now? (a) north (b) south (c) east (d) west
14. 14.True or false: “a long factory floor” suits tracks. (a) True (b) False
15. 15.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
16. 16.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
17. 17.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) not at all (c) faster and weaker (d) slower but stronger
18. 18.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 75. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
20. 20.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
21. 21.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 330 cm?
22. 22.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a sound sensor (c) a camera (d) a touch sensor
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
24. 24.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
25. 25.🧭 A robot faces south. It does: turn left, turn around, turn left, turn left. Which way does it face now? (a) west (b) north (c) east (d) south
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
27. 27.⚙️ A motor makes 400 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
28. 28.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
29. 29.📡 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
30. 30.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they spin in the air (d) they are shiny
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
33. 33.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
34. 34.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
35. 35.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) propellers (c) wheels (d) legs
36. 36.🧭 A robot faces west. It does: turn left, turn right. Which way does it face now? (a) east (b) south (c) north (d) west
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
38. 38.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 360° (d) 180°
39. 39.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
40. 40.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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