Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 513 · 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.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) wheels (c) legs (d) tracks
2. 2.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 85. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
5. 5.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
6. 6.True or false: to follow a black line, use a sound sensor. (a) True (b) False
7. 7.🧭 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 270°. It turns right 30°, then left 90°. What does the gyro read now (0° to 359°)?
8. 8.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
9. 9.Which of these suits propellers? (a) hovering over a roof (b) a long factory floor (c) a muddy building site (d) a flat road
10. 10.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) tracks (c) wheels (d) legs
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
12. 12.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a touch sensor
13. 13.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 35 times. How many times does the driven gear turn?
14. 14.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight back (b) turns right (c) turns left (d) stays still
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
16. 16.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
17. 17.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a light sensor (c) a camera (d) a distance sensor
18. 18.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
19. 19.⚙️ 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
20. 20.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) fast and easy on floors (d) they look funny
21. 21.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
22. 22.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
23. 23.True or false: to start on a hand clap, use a sound sensor. (a) True (b) False
24. 24.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
25. 25.🔍 Which sensor helps a robot read a QR code? (a) a temperature sensor (b) a distance sensor (c) a camera (d) a touch sensor
26. 26.🧭 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 45°, then right 120°. What does the gyro read now (0° to 359°)?
27. 27.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 80. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
28. 28.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
29. 29.🧭 A robot should turn right 180°, but its gyro shows it turned 183°. How many degrees must it turn back to the left?
30. 30.True or false: to know a button is pressed, use a light sensor. (a) True (b) False
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
32. 32.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
33. 33.🧭 How many degrees is a full turn? (a) 360° (b) 90° (c) 180° (d) 100°
34. 34.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.⚙️ A 36-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
36. 36.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
37. 37.True or false: “soft snow” suits tracks. (a) False (b) True
38. 38.📡 A robot is 110 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)?
39. 39.🧭 A robot should turn right 180°, but its gyro shows it turned 189°. How many degrees must it turn back to the left?
40. 40.🛞 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 12 times. How far does the robot roll (in cm)?

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