Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 543 · 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 35 and the right sensor reads 40. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
2. 2.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a white surface (c) a dark tunnel (d) a black surface
5. 5.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
6. 6.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) sound too high to hear (d) radio music
7. 7.🦾 A servo program runs:
   angle = 60
   angle = angle − 10
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
8. 8.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) backwards (d) nowhere
10. 10.📡 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?
11. 11.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
12. 12.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
13. 13.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
14. 14.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) a wheel (d) an input
15. 15.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
16. 16.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
17. 17.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
18. 18.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
19. 19.Which of these suits legs? (a) soft snow (b) stepping over wide gaps (c) flying over a field (d) a long factory floor
20. 20.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times faster (d) 3 times bigger
21. 21.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a metal door (d) a flat wall
22. 22.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
24. 24.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
25. 25.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 360° (d) 180°
26. 26.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
27. 27.Which of these suits wheels? (a) soft snow (b) a long factory floor (c) deep mud (d) flying over a field
28. 28.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) propellers (b) tracks (c) wheels (d) legs
29. 29.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) number of gears (d) motor volts
30. 30.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 35. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
33. 33.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
35. 35.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
37. 37.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
39. 39.🧭 A robot should turn right 180°, but its gyro shows it turned 169°. How many degrees must it turn more to the right?
40. 40.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small

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