Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 73 · 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.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) harder to balance (d) they never tire
2. 2.🛞 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) spins right on the spot (b) turns left (c) turns right (d) stays still
3. 3.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 90° (d) 360°
4. 4.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) wheel size (d) motor volts
5. 5.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.⬛ 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
7. 7.🧭 A robot should turn right 180°, but its gyro shows it turned 172°. How many degrees must it turn more to the right?
8. 8.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
10. 10.True or false: “a hospital corridor” suits wheels. (a) False (b) True
11. 11.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) never important (d) small (fast, weak)
12. 12.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
14. 14.🦾 A servo moves from 100° to 140°. How many degrees does it turn?
15. 15.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
16. 16.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
17. 17.🧭 A robot should turn right 180°, but its gyro shows it turned 171°. How many degrees must it turn more to the right?
18. 18.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
20. 20.⚙️ 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 small driver gear (b) a big driver gear
21. 21.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
22. 22.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
23. 23.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 180° (d) 45°
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 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
25. 25.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
27. 27.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
28. 28.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its diameter (c) its weight (d) its circumference
29. 29.Which of these suits tracks? (a) flying over a field (b) a hospital corridor (c) stepping over wide gaps (d) loose sand dunes
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
31. 31.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
32. 32.True or false: to know a button is pressed, use a temperature sensor. (a) True (b) False
33. 33.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 42. What is under the sensor? (a) the black line (b) the white floor
34. 34.🦾 A servo moves from 90° to 100°. How many degrees does it turn?
35. 35.🧭 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 left 120°, then right 90°, then left 90°. What does the gyro read now (0° to 359°)?
36. 36.True or false: “hovering over a roof” suits propellers. (a) False (b) True
37. 37.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) water (d) white
38. 38.📡 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?
39. 39.True or false: to spot a red ball, use a camera. (a) True (b) False
40. 40.Which job needs a sound sensor? (a) start on a hand clap (b) warn if motors get hot (c) follow a black line (d) know a button is pressed

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