Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 167 · 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 arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points up and right (c) points up and left (d) points left
2. 2.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
3. 3.🧭 A robot should turn right 45°, but its gyro shows it turned 33°. How many degrees must it turn more to the right?
4. 4.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
5. 5.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
6. 6.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
7. 7.True or false: to stop before a wall, use a camera. (a) True (b) False
8. 8.🧭 A robot faces west. It does: turn around, turn left, turn right. Which way does it face now? (a) east (b) west (c) north (d) south
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
10. 10.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a white surface (d) a dark tunnel
11. 11.🔍 Which sensor helps a robot follow a black line? (a) a touch sensor (b) a gyro sensor (c) a temperature sensor (d) a light sensor
12. 12.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and left (b) points left (c) points up and right (d) points straight up
13. 13.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
14. 14.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
15. 15.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a touch sensor (c) a distance sensor (d) a gyro sensor
17. 17.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) between the two sensors (d) under the left sensor
18. 18.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a cow (d) a bat
19. 19.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) a gear (c) an output (d) an input
21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
22. 22.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
23. 23.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
24. 24.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) propellers (c) wheels (d) legs
26. 26.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
27. 27.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
28. 28.True or false: “a hospital corridor” suits propellers. (a) False (b) True
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
31. 31.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
32. 32.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
33. 33.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
34. 34.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1188 cm?
35. 35.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
36. 36.🛞 Circumference = π × … (a) radius only (b) speed (c) weight (d) diameter
37. 37.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
38. 38.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
39. 39.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a touch sensor (c) a light sensor (d) a temperature sensor
40. 40.Which of these suits wheels? (a) soft snow (b) hovering over a roof (c) a field of tall boulders (d) a hospital corridor

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