Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 493 · 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 has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 40. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
2. 2.True or false: to warn if motors get hot, use a temperature sensor. (a) False (b) True
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
4. 4.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 3 (c) 4 (d) 1
6. 6.🦾 A servo program runs:
   angle = 50
   angle = angle + 60
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
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.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
9. 9.True or false: to measure a turn angle, use a gyro sensor. (a) False (b) True
10. 10.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 10
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
11. 11.Which of these suits tracks? (a) a field of tall boulders (b) deep mud (c) a hospital corridor (d) a smooth classroom floor
12. 12.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
13. 13.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is hot (c) black is loud (d) black is wet
14. 14.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
15. 15.Which of these suits propellers? (a) a field of tall boulders (b) hovering over a roof (c) loose sand dunes (d) a long factory floor
16. 16.Which job needs a touch sensor? (a) know a button is pressed (b) measure how far a box is (c) hear a whistle (d) warn if motors get hot
17. 17.📡 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?
18. 18.Which of these suits propellers? (a) a flat road (b) moving under water (c) a long factory floor (d) a hospital corridor
19. 19.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) radio music (c) bright light (d) water drops
20. 20.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
22. 22.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 10. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
24. 24.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 32. What is under the sensor? (a) the black line (b) the white floor
25. 25.⚙️ 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
26. 26.True or false: to hear a whistle, use a temperature sensor. (a) True (b) False
27. 27.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a caster wheel (c) a track (d) a servo
28. 28.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) small (fast, weak) (d) big (slow and strong)
29. 29.🧭 A robot faces west. It does: turn around, turn left. Which way does it face now? (a) south (b) east (c) north (d) west
30. 30.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 20. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
32. 32.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
33. 33.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
34. 34.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
35. 35.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times louder (d) 3 times faster
36. 36.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a sound sensor (c) a gyro sensor (d) a touch sensor
37. 37.🦾 A servo moves from 40° to 0°. How many degrees does it turn?
38. 38.True or false: “a field of tall boulders” suits wheels. (a) False (b) True
39. 39.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
40. 40.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 5. What is under the sensor? (a) the black line (b) the white floor

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