Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 969 · 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 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
2. 2.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
3. 3.🦾 A servo program runs:
   angle = 70
   angle = angle + 30
   angle = angle − 20
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
6. 6.Which job needs a sound sensor? (a) know a button is pressed (b) stay balanced upright (c) feel a bump into a wall (d) start on a hand clap
7. 7.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a gyro sensor (c) a light sensor (d) a temperature sensor
8. 8.🧭 A robot faces north. It does: turn left, turn right. Which way does it face now? (a) south (b) north (c) east (d) west
9. 9.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
11. 11.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 46. What is under the sensor? (a) the black line (b) the white floor
12. 12.🛞 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 right (b) spins right on the spot (c) spins left on the spot (d) stays still
13. 13.📡 A robot is 200 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 35 seconds (in cm)?
14. 14.True or false: to read a QR code, use a touch sensor. (a) True (b) False
15. 15.🧭 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 right 60°, then right 60°. What does the gyro read now (0° to 359°)?
16. 16.📡 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) No (b) Yes
17. 17.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
18. 18.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 46. What is under the sensor? (a) the black line (b) the white floor
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.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
21. 21.⚙️ A 10-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
22. 22.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
23. 23.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
24. 24.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) legs (c) tracks (d) propellers
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
26. 26.🔦 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 white floor (b) the black line
27. 27.🧭 A robot faces east. It does: turn left, turn around, turn left, turn left. Which way does it face now? (a) west (b) east (c) south (d) north
28. 28.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
29. 29.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
30. 30.🛞 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) goes straight forward (b) curves to the left (c) curves to the right
31. 31.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) white (d) water
33. 33.🔍 Which sensor helps a robot find the brightest spot? (a) a gyro sensor (b) a temperature sensor (c) a touch sensor (d) a light sensor
34. 34.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 30
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) goes straight back (d) turns right
38. 38.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
39. 39.⬛ 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
40. 40.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?

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