Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 535 · 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.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 360° (d) 100°
2. 2.⚙️ A motor makes 550 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
3. 3.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
4. 4.True or false: “soft snow” suits tracks. (a) False (b) True
5. 5.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 3 cm (d) 1 km
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
7. 7.⚙️ A motor makes 480 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?
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
9. 9.🛞 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) turns left (b) goes straight back (c) goes straight forward (d) stays still
10. 10.🧭 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 left 90°, then left 60°. What does the gyro read now (0° to 359°)?
11. 11.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
12. 12.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
13. 13.📡 A robot is 200 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
14. 14.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black soaks up light (d) black is loud
15. 15.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
16. 16.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 704 cm?
17. 17.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) they float (d) fast and easy on floors
18. 18.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
19. 19.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
20. 20.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
21. 21.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
22. 22.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
23. 23.🧭 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 right 180°, then left 90°. What does the gyro read now (0° to 359°)?
24. 24.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
25. 25.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
26. 26.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) slower (c) faster (d) backwards
27. 27.🧭 A robot spins 15° every second. How many seconds does it take to turn 285°?
28. 28.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) propellers (c) wheels (d) legs
29. 29.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) turns left (b) turns right (c) spins right on the spot (d) goes straight back
30. 30.🔍 Which sensor helps a robot know a button is pressed? (a) a sound sensor (b) a gyro sensor (c) a touch sensor (d) a temperature sensor
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
32. 32.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
33. 33.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
34. 34.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a sound sensor (d) a touch sensor
35. 35.🔍 Which sensor helps a robot stop before a wall? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🧭 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 right 45°, then left 180°, then left 45°. What does the gyro read now (0° to 359°)?
38. 38.🧭 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 left 30°, then right 30°. What does the gyro read now (0° to 359°)?
39. 39.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
40. 40.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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