Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 908 · 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.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) faster (c) nowhere (d) slower
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
3. 3.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
4. 4.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points straight up (b) points up and right (c) points up and left (d) points right
5. 5.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 68. What is under the sensor? (a) the black line (b) the white floor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
7. 7.🧭 A robot faces west. It does: turn around, turn around. Which way does it face now? (a) south (b) north (c) west (d) east
8. 8.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 64. What is under the sensor? (a) the black line (b) the white floor
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 5 times (in cm)? =
10. 10.True or false: to feel a bump into a wall, use a light sensor. (a) False (b) True
11. 11.🛞 Circumference = π × … (a) diameter (b) radius only (c) weight (d) speed
12. 12.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 154 cm?
13. 13.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
14. 14.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 20. What is under the sensor? (a) the white floor (b) the black line
15. 15.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 44. What is under the sensor? (a) the black line (b) the white floor
16. 16.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
17. 17.🔍 Which sensor helps a robot measure a turn angle? (a) a light sensor (b) a touch sensor (c) a gyro sensor (d) a distance sensor
18. 18.🔍 Which sensor helps a robot hear a whistle? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
19. 19.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
20. 20.📡 A robot is 150 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
22. 22.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a touch sensor (c) a gyro sensor (d) a camera
23. 23.Which of these suits legs? (a) a long factory floor (b) loose sand dunes (c) a smooth classroom floor (d) a field of tall boulders
24. 24.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
26. 26.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.🧭 A robot spins 45° every second. How many seconds does it take to turn 315°?
28. 28.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
29. 29.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a temperature sensor (c) a gyro sensor (d) a distance sensor
30. 30.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) never important (d) big (slow and strong)
31. 31.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
33. 33.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a gear (c) a servo (d) a caster wheel
34. 34.🧭 A robot faces north. It does: turn right, turn right, turn around, turn around. Which way does it face now? (a) east (b) north (c) west (d) south
35. 35.🦾 A servo moves from 40° to 170°. How many degrees does it turn?
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
37. 37.⬛ 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
38. 38.Which of these suits wheels? (a) a flat road (b) flying over a field (c) a field of tall boulders (d) stepping over wide gaps
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.⚙️ A 10-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed

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