Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 145 · 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 job needs a distance sensor? (a) find the brightest spot (b) hear a whistle (c) know a button is pressed (d) stop before a wall
2. 2.📡 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?
3. 3.🦾 A servo program runs:
   angle = 0
   angle = angle + 20
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
5. 5.🔍 Which sensor helps a robot spot a red ball? (a) a sound sensor (b) a touch sensor (c) a gyro sensor (d) a camera
6. 6.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
7. 7.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
8. 8.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a camera (c) a temperature sensor (d) a distance sensor
9. 9.🛞 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) stays still (b) spins left on the spot (c) goes straight back (d) spins right on the spot
10. 10.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) they climb stairs (d) fast and easy on floors
11. 11.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
12. 12.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 40
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.🧭 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 90°. It turns right 60°, then left 30°. What does the gyro read now (0° to 359°)?
15. 15.🧭 A robot spins 15° every second. How many seconds does it take to turn 315°?
16. 16.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
17. 17.🛞 Which way of moving suits this best: “soft snow”? (a) legs (b) propellers (c) wheels (d) tracks
18. 18.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points right (c) points up and left (d) points straight up
19. 19.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a soft foam cushion (d) a metal door
20. 20.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
21. 21.Which of these suits legs? (a) a long factory floor (b) deep mud (c) a smooth classroom floor (d) a field of tall boulders
22. 22.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
23. 23.⚙️ A motor makes 600 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
24. 24.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) not at all (c) at the same speed (d) slower but stronger
25. 25.🦾 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 straight up (c) points up and left (d) points up and right
26. 26.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
27. 27.🦾 A servo moves from 40° to 90°. How many degrees does it turn?
28. 28.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
29. 29.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
30. 30.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
31. 31.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) in opposite directions (c) they do not turn (d) one up, one down
32. 32.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 29. What is under the sensor? (a) the white floor (b) the black line
33. 33.🦾 A servo moves from 100° to 0°. How many degrees does it turn?
34. 34.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
35. 35.⚙️ An 8-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
37. 37.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
38. 38.⚙️ An 8-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
39. 39.🧭 What does a gyro help a robot do? (a) smell smoke (b) turn by exact angles (c) see colours (d) hear claps
40. 40.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?

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