Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 945 · 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’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
2. 2.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
3. 3.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 110
   angle = angle − 60
   angle = angle − 50
   angle = angle + 40
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
5. 5.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 65. What is under the sensor? (a) the black line (b) the white floor
6. 6.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to look colourful (d) to use more power
7. 7.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
8. 8.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.🔍 Which sensor helps a robot read a QR code? (a) a gyro sensor (b) a camera (c) a sound sensor (d) a light sensor
11. 11.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
12. 12.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
14. 14.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) colour (d) temperature
15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a metal door (d) a soft foam cushion
16. 16.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
17. 17.⚙️ 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
18. 18.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 90° (d) 180°
19. 19.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
20. 20.🛞 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)? =
21. 21.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
22. 22.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
23. 23.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
24. 24.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) tyre (c) idler gear (d) driver gear
25. 25.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
26. 26.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
27. 27.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
28. 28.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) tracks (c) wheels (d) legs
29. 29.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 5. What is under the sensor? (a) the white floor (b) the black line
30. 30.🛞 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) goes straight forward (b) stays still (c) spins left on the spot (d) turns right
31. 31.⚙️ A motor makes 100 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
34. 34.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
35. 35.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a goldfish (c) a snail (d) a cow
36. 36.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
38. 38.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
39. 39.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
40. 40.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its diameter (c) its radius (d) its weight

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