Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 363 · 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 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
2. 2.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22/7 (c) 2/7 (d) 22
3. 3.🧭 A robot spins 30° every second. How many seconds does it take to turn 60°?
4. 4.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) driver teeth (d) wheel size
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
6. 6.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) one up, one down (d) the same direction
7. 7.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 29. What is under the sensor? (a) the white floor (b) the black line
8. 8.🦾 A servo program runs:
   angle = 120
   angle = angle − 20
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
9. 9.🔍 Which sensor helps a robot read a QR code? (a) a light sensor (b) a camera (c) a gyro sensor (d) a sound sensor
10. 10.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they spin in the air (c) they are shiny (d) they are round
11. 11.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) white (d) water
12. 12.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) goes straight back (b) goes straight forward (c) spins right on the spot (d) turns right
13. 13.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) the sensor is half (d) it goes there and back
14. 14.🧭 A robot spins 15° every second. How many seconds does it take to turn 120°?
15. 15.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
17. 17.True or false: to hear a whistle, use a sound sensor. (a) False (b) True
18. 18.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
19. 19.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
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.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it uses a sail (c) it stops for ever (d) one wheel runs faster
23. 23.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its circumference (c) its diameter (d) its weight
24. 24.📡 A robot is 140 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
25. 25.Which of these suits wheels? (a) flying over a field (b) moving under water (c) a long factory floor (d) crossing stepping-stones
26. 26.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) spins left on the spot (b) goes straight back (c) turns right (d) spins right on the spot
27. 27.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
29. 29.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
31. 31.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a track (c) a servo (d) a gear
33. 33.📡 A robot is 230 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 9 seconds (in cm)?
34. 34.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 85. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
37. 37.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
38. 38.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 12 seconds (in cm)?
39. 39.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
40. 40.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?

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