Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 256 · 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 light sensor reads below 40 over a black line and above 40 over the white floor. It reads 54. What is under the sensor? (a) the black line (b) the white floor
2. 2.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
3. 3.True or false: to spot a red ball, use a camera. (a) True (b) False
4. 4.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.⚙️ A motor makes 210 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
6. 6.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
7. 7.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
9. 9.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
10. 10.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
11. 11.True or false: to hear a whistle, use a camera. (a) False (b) True
12. 12.True or false: to read a QR code, use a camera. (a) False (b) True
13. 13.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 45° (d) 180°
14. 14.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
15. 15.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.Which of these suits tracks? (a) a muddy building site (b) hovering over a roof (c) a smooth classroom floor (d) a flat road
18. 18.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
19. 19.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle + 60
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a touch sensor (c) a gyro sensor (d) a temperature sensor
23. 23.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
25. 25.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 30
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns right (b) spins left on the spot (c) spins right on the spot (d) turns left
29. 29.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
30. 30.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a dark tunnel (c) a black surface (d) a black line
31. 31.🛞 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 backward. What does the robot do? (a) goes straight forward (b) spins left on the spot (c) stays still (d) goes straight back
32. 32.🧭 A robot faces south. It does: turn right, turn around, turn left. Which way does it face now? (a) west (b) east (c) north (d) south
33. 33.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
34. 34.Which of these suits wheels? (a) stepping over wide gaps (b) a flat road (c) deep mud (d) hovering over a roof
35. 35.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
36. 36.🧭 A robot faces north. It does: turn right, turn around, turn around, turn around. Which way does it face now? (a) east (b) south (c) west (d) north
37. 37.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a caster wheel (c) a gear (d) a servo
38. 38.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they look funny (c) they climb stairs (d) they float
39. 39.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
40. 40.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?

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