Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 365 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
2. 2.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a touch sensor (c) a temperature sensor (d) a camera
3. 3.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
4. 4.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 360° (d) 90°
6. 6.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
7. 7.🧭 A robot should turn right 90°, but its gyro shows it turned 80°. How many degrees must it turn more to the right?
8. 8.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) an input (d) a gear
9. 9.🦾 A servo program runs:
   angle = 60
   angle = angle − 50
   angle = angle + 60
   angle = angle + 10
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
12. 12.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 4 (d) 1
13. 13.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 54. What is under the sensor? (a) the white floor (b) the black line
14. 14.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
15. 15.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
16. 16.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.Which job needs a temperature sensor? (a) measure a turn angle (b) warn if motors get hot (c) hear a whistle (d) stop before a wall
19. 19.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
21. 21.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a servo (c) a track (d) a gear
22. 22.True or false: “flying over a field” suits wheels. (a) True (b) False
23. 23.🧭 A robot should turn right 90°, but its gyro shows it turned 81°. How many degrees must it turn more to the right?
24. 24.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
25. 25.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points left (c) points up and left (d) points right
26. 26.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
27. 27.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are shiny (c) they are round (d) they spin in the air
28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: to follow a black line, use a light sensor. (a) True (b) False
30. 30.🧭 A robot should turn right 90°, but its gyro shows it turned 92°. How many degrees must it turn back to the left?
31. 31.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
32. 32.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
33. 33.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
34. 34.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
35. 35.⚙️ 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
36. 36.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
37. 37.True or false: “a flat road” suits wheels. (a) True (b) False
38. 38.🛞 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 forward. What does the robot do? (a) spins left on the spot (b) goes straight forward (c) turns left (d) spins right on the spot
39. 39.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
40. 40.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a metal door (d) a soft foam cushion

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