Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 918 · 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.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the wheel size (c) the battery size (d) the top speed
2. 2.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
4. 4.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
5. 5.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.🦾 A servo program runs:
   angle = 80
   angle = angle + 30
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a track (c) a servo (d) a caster wheel
9. 9.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
11. 11.🧭 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 90°. It turns left 135°, then right 90°. What does the gyro read now (0° to 359°)?
12. 12.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) the same direction (d) in opposite directions
13. 13.⚙️ 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
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
15. 15.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
16. 16.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
17. 17.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) driven gear (d) tyre
20. 20.Which of these suits legs? (a) a flat road (b) soft snow (c) a muddy building site (d) stepping over wide gaps
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
22. 22.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
23. 23.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
24. 24.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a touch sensor (c) a gyro sensor (d) a sound sensor
26. 26.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
28. 28.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
29. 29.🧭 A robot should turn right 45°, but its gyro shows it turned 39°. How many degrees must it turn more to the right?
30. 30.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
31. 31.📡 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
32. 32.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
33. 33.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) turn by exact angles (d) hear claps
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🛞 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) turns right (b) turns left (c) spins left on the spot (d) goes straight back
36. 36.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black is hot (d) black soaks up light
37. 37.Which of these suits tracks? (a) a flat road (b) moving under water (c) deep mud (d) crossing stepping-stones
38. 38.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
39. 39.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
40. 40.🔍 What does a gyro sensor measure? (a) temperature (b) sound (c) turning (rotation) (d) colour

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