Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 890 · 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.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) big (slow and strong) (d) small (fast, weak)
2. 2.🔍 Which sensor helps a robot spot a red ball? (a) a gyro sensor (b) a light sensor (c) a camera (d) a touch sensor
3. 3.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) faster (c) backwards (d) nowhere
4. 4.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
5. 5.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) between the two sensors (c) under the left sensor (d) under the right sensor
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
7. 7.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
8. 8.Which of these suits wheels? (a) soft snow (b) loose sand dunes (c) a long factory floor (d) a muddy building site
9. 9.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
10. 10.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.True or false: “a long factory floor” suits wheels. (a) False (b) True
13. 13.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
14. 14.🔍 Which sensor helps a robot stop before a wall? (a) a sound sensor (b) a light sensor (c) a distance sensor (d) a gyro sensor
15. 15.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
16. 16.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) they never tire (d) harder to balance
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 75. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
19. 19.📡 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
20. 20.📡 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)?
21. 21.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
22. 22.Which of these suits wheels? (a) crossing stepping-stones (b) a hospital corridor (c) moving under water (d) a muddy building site
23. 23.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) an output (c) a gear (d) a wheel
24. 24.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
25. 25.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
26. 26.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
27. 27.Which job needs a camera? (a) know a button is pressed (b) measure how far a box is (c) read a QR code (d) stop before a wall
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
29. 29.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
31. 31.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
32. 32.📡 A robot is 110 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 4 seconds (in cm)?
33. 33.True or false: “loose sand dunes” suits tracks. (a) True (b) False
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
37. 37.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 2/7 (c) 7/22 (d) 22
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
39. 39.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 90. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor

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