Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 115 · 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.🔍 Which sensor helps a robot hear a whistle? (a) a sound sensor (b) a camera (c) a temperature sensor (d) a touch sensor
2. 2.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
3. 3.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
4. 4.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.🧭 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 270°. It turns left 120°, then right 30°, then left 90°. What does the gyro read now (0° to 359°)?
7. 7.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
8. 8.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they look funny (c) they climb stairs (d) they float
9. 9.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points straight up
10. 10.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
11. 11.True or false: to find the brightest spot, use a light sensor. (a) False (b) True
12. 12.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
13. 13.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) the sky (d) water
14. 14.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 20
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
16. 16.Which job needs a touch sensor? (a) hear a whistle (b) follow a black line (c) stop before a wall (d) feel a bump into a wall
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
18. 18.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
19. 19.🧭 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 180°. It turns right 30°, then right 135°, then right 135°. What does the gyro read now (0° to 359°)?
20. 20.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times faster (d) 3 times louder
21. 21.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 4 (d) 2
22. 22.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
23. 23.🧭 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 180°. It turns right 180°, then right 120°. What does the gyro read now (0° to 359°)?
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
25. 25.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
28. 28.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
29. 29.🧭 A robot spins 45° every second. How many seconds does it take to turn 135°?
30. 30.🛞 Which way of moving suits this best: “a flat road”? (a) propellers (b) legs (c) wheels (d) tracks
31. 31.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
32. 32.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a white surface (d) a black line
33. 33.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 46. What is under the sensor? (a) the black line (b) the white floor
34. 34.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.True or false: “stepping over wide gaps” suits wheels. (a) False (b) True
36. 36.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) slower but stronger (c) not at all (d) at the same speed
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
38. 38.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
40. 40.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 100° (d) 180°

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