Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 173 · 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.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
2. 2.📡 A robot is 230 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 2 seconds (in cm)?
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
4. 4.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) temperature (d) colour
5. 5.True or false: “a long factory floor” suits tracks. (a) True (b) False
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
7. 7.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they spin in the air (d) they are round
8. 8.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
9. 9.Which of these suits tracks? (a) deep mud (b) flying over a field (c) a smooth classroom floor (d) a hospital corridor
10. 10.🧭 A robot faces east. It does: turn left, turn left. Which way does it face now? (a) east (b) west (c) south (d) north
11. 11.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
13. 13.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
14. 14.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
15. 15.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
17. 17.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
18. 18.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
20. 20.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
21. 21.True or false: to stop before a wall, use a sound sensor. (a) False (b) True
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
24. 24.⬛ 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
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 75. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
26. 26.True or false: “a field of tall boulders” suits tracks. (a) False (b) True
27. 27.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 45° (d) 90°
28. 28.🛞 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) stays still (b) goes straight back (c) spins left on the spot (d) turns right
29. 29.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) driven gear (d) tyre
30. 30.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points left (c) points up and right (d) points up and left
31. 31.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a touch sensor (c) a gyro sensor (d) a camera
32. 32.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they look funny (c) they float (d) they climb stairs
33. 33.Which of these suits tracks? (a) a long factory floor (b) loose sand dunes (c) flying over a field (d) a flat road
34. 34.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 23 seconds (in cm)?
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 35. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
36. 36.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a camera (c) a sound sensor (d) a gyro sensor
37. 37.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 1 (d) 3
38. 38.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
39. 39.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) faster (c) backwards (d) slower
40. 40.⚙️ 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 big driver gear (b) a small driver gear

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