Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 249 · 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 robot is 180 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
3. 3.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
4. 4.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 20. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
6. 6.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is loud (d) black is hot
7. 7.🧭 A robot should turn right 180°, but its gyro shows it turned 194°. How many degrees must it turn back to the left?
8. 8.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
9. 9.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
11. 11.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) in opposite directions (c) one up, one down (d) the same direction
12. 12.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times faster (d) 3 times slower
13. 13.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) at the same speed (c) not at all (d) slower but stronger
14. 14.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
15. 15.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
16. 16.🧭 A robot should turn right 45°, but its gyro shows it turned 52°. How many degrees must it turn back to the left?
17. 17.🧭 A robot spins 15° every second. How many seconds does it take to turn 330°?
18. 18.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
19. 19.True or false: to measure a turn angle, use a gyro sensor. (a) False (b) True
20. 20.Which of these suits tracks? (a) hovering over a roof (b) a flat road (c) a hospital corridor (d) loose sand dunes
21. 21.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
22. 22.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 360° (d) 90°
23. 23.⚙️ A motor makes 120 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
25. 25.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
26. 26.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
30. 30.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
31. 31.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 30. What is under the sensor? (a) the white floor (b) the black line
32. 32.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
33. 33.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) legs (c) tracks (d) propellers
34. 34.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) radio music (d) sound too high to hear
35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
36. 36.🛞 Which way of moving suits this best: “hovering over a roof”? (a) propellers (b) legs (c) wheels (d) tracks
37. 37.🛞 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)? =
38. 38.📡 A robot is 270 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 9 seconds (in cm)?
39. 39.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
40. 40.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 66 cm?

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