Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 875 · 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 fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
2. 2.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spin in the air (d) they spread the weight
3. 3.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) legs (c) propellers (d) wheels
4. 4.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 46. What is under the sensor? (a) the white floor (b) the black line
5. 5.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a servo (c) a track (d) a gear
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
7. 7.Which of these suits propellers? (a) soft snow (b) deep mud (c) a field of tall boulders (d) hovering over a roof
8. 8.🛞 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) turns left (b) goes straight forward (c) turns right (d) goes straight back
9. 9.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
10. 10.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) propellers (c) wheels (d) legs
11. 11.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 51. What is under the sensor? (a) the black line (b) the white floor
12. 12.🔍 Which sensor helps a robot read a QR code? (a) a distance sensor (b) a camera (c) a touch sensor (d) a sound sensor
13. 13.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
14. 14.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
15. 15.⚙️ 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
16. 16.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.🔢 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
18. 18.🛞 Circumference = π × … (a) radius only (b) weight (c) diameter (d) speed
19. 19.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
20. 20.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the top speed (d) the black/white cut-off
21. 21.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) an input (d) a gear
22. 22.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a touch sensor (d) a gyro sensor
23. 23.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a sound sensor
24. 24.🧭 A robot faces north. It does: turn around, turn around, turn around. Which way does it face now? (a) east (b) south (c) north (d) west
25. 25.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
26. 26.🧭 A robot spins 45° every second. How many seconds does it take to turn 90°?
27. 27.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 180° (d) 90°
29. 29.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
30. 30.📡 A robot is 150 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
31. 31.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
32. 32.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
33. 33.🛞 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)? =
34. 34.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
35. 35.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
36. 36.🧭 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 right 30°, then left 45°. What does the gyro read now (0° to 359°)?
37. 37.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 75. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
40. 40.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?

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