Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 206 · 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 motor makes 300 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
2. 2.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 56. What is under the sensor? (a) the black line (b) the white floor
3. 3.⚙️ A 24-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
4. 4.🧭 A robot faces east. It does: turn right, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
5. 5.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a temperature sensor (c) a touch sensor (d) a gyro sensor
6. 6.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
8. 8.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
9. 9.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a track (d) a caster wheel
10. 10.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) propellers (c) wheels (d) legs
11. 11.True or false: “flying over a field” suits propellers. (a) False (b) True
12. 12.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
13. 13.🔍 Which sensor helps a robot spot a red ball? (a) a camera (b) a light sensor (c) a sound sensor (d) a touch sensor
14. 14.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
15. 15.🧭 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 180°. It turns right 45°, then right 135°, then right 45°. What does the gyro read now (0° to 359°)?
16. 16.True or false: to hear a whistle, use a touch sensor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
18. 18.⚙️ A motor makes 300 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?
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 75. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
20. 20.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
21. 21.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 3 cm (d) 34 cm
22. 22.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
23. 23.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) hear claps (d) turn by exact angles
24. 24.True or false: “a smooth classroom floor” suits wheels. (a) True (b) False
25. 25.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a gyro sensor (c) a temperature sensor (d) a sound sensor
26. 26.🔍 Which sensor helps a robot follow a black line? (a) a temperature sensor (b) a touch sensor (c) a camera (d) a light sensor
27. 27.📡 A robot is 210 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
28. 28.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
29. 29.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) tracks (c) wheels (d) legs
30. 30.🔍 Which sensor helps a robot hear a whistle? (a) a light sensor (b) a distance sensor (c) a touch sensor (d) a sound sensor
31. 31.🔍 Which sensor helps a robot start on a hand clap? (a) a touch sensor (b) a light sensor (c) a gyro sensor (d) a sound sensor
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
33. 33.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the left sensor (d) under the right sensor
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
35. 35.True or false: to read a QR code, use a touch sensor. (a) True (b) False
36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
37. 37.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
38. 38.Which job needs a distance sensor? (a) stop before a wall (b) start on a hand clap (c) spot a red ball (d) hear a whistle
39. 39.🛞 Why do most indoor robots use wheels? (a) they float (b) fast and easy on floors (c) they look funny (d) they climb stairs
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True

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