Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 634 · 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.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 45° (d) 180°
2. 2.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 54. What is under the sensor? (a) the white floor (b) the black line
4. 4.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) an output (c) a wheel (d) a gear
6. 6.Which job needs a gyro sensor? (a) warn if motors get hot (b) know a button is pressed (c) measure a turn angle (d) find the brightest spot
7. 7.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
8. 8.📡 Why do we halve the echo’s total path? (a) sound is slow (b) the sensor is half (c) to make it smaller (d) it goes there and back
9. 9.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero
10. 10.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is loud (c) black is wet (d) black soaks up light
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
12. 12.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) at the same speed (c) slower but stronger (d) faster but weaker
13. 13.🔦 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
14. 14.🔦 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
15. 15.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
16. 16.🧭 A robot should turn right 180°, but its gyro shows it turned 183°. How many degrees must it turn back to the left?
17. 17.True or false: “a smooth classroom floor” suits tracks. (a) False (b) True
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
19. 19.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 90° (d) 360°
20. 20.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a touch sensor (c) a temperature sensor (d) a camera
21. 21.🧭 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 left 90°, then right 45°. What does the gyro read now (0° to 359°)?
22. 22.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) sound too high to hear (d) bright light
23. 23.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) wheels (c) propellers (d) tracks
24. 24.🛞 Circumference = π × … (a) speed (b) radius only (c) diameter (d) weight
25. 25.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
27. 27.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
28. 28.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) tracks (c) propellers (d) wheels
29. 29.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 61. What is under the sensor? (a) the black line (b) the white floor
31. 31.⚙️ A motor makes 360 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
32. 32.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) propellers (c) wheels (d) legs
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.⬛ The threshold of a light sensor is … (a) the battery size (b) the wheel size (c) the black/white cut-off (d) the top speed
35. 35.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
36. 36.🧭 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 270°. It turns left 120°, then left 30°. What does the gyro read now (0° to 359°)?
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
39. 39.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

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