Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 865 · 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 has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 10. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
2. 2.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
3. 3.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
5. 5.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 990 cm?
6. 6.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
7. 7.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.Which of these suits wheels? (a) a smooth classroom floor (b) stepping over wide gaps (c) moving under water (d) flying over a field
9. 9.📡 A robot is 290 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 14 seconds (in cm)?
10. 10.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 75. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
11. 11.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
12. 12.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) driver teeth (d) wheel size
13. 13.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) turning (rotation) (d) temperature
14. 14.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
16. 16.🛞 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 6 times. How far does the robot roll (in cm)?
17. 17.🛞 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?
18. 18.🔍 Which sensor helps a robot start on a hand clap? (a) a camera (b) a sound sensor (c) a touch sensor (d) a distance sensor
19. 19.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
20. 20.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a white surface (d) a black surface
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
23. 23.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) black (d) the sky
24. 24.Which job needs a touch sensor? (a) find the brightest spot (b) know a button is pressed (c) stay balanced upright (d) measure how far a box is
25. 25.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 53. What is under the sensor? (a) the black line (b) the white floor
26. 26.⚙️ 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
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
28. 28.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
29. 29.🛞 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 left on the spot (b) stays still (c) turns left (d) turns right
30. 30.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
31. 31.🔍 Why do robots need sensors? (a) to know their world (b) to use more power (c) to look colourful (d) to be heavier
32. 32.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
33. 33.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
35. 35.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) zero (d) big (slow and strong)
36. 36.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
37. 37.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 18. What is under the sensor? (a) the white floor (b) the black line
38. 38.🧭 A robot should turn right 90°, but its gyro shows it turned 102°. How many degrees must it turn back to the left?
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.True or false: “spins round and round” is true of a servo motor. (a) True (b) False

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