Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 414 · 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.📡 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?
2. 2.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
3. 3.⚙️ A 12-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
4. 4.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
5. 5.🧭 A robot should turn right 90°, but its gyro shows it turned 82°. How many degrees must it turn more to the right?
6. 6.🛞 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 forward. What does the robot do? (a) stays still (b) goes straight back (c) spins left on the spot (d) spins right on the spot
7. 7.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
8. 8.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
9. 9.🧭 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 60°, then left 30°. What does the gyro read now (0° to 359°)?
10. 10.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
11. 11.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
12. 12.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
13. 13.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) big (slow and strong) (d) small (fast, weak)
14. 14.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 180° (d) 360°
15. 15.Which of these suits tracks? (a) crossing stepping-stones (b) hovering over a roof (c) loose sand dunes (d) moving under water
16. 16.🛞 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) turns right (c) goes straight back (d) spins left on the spot
17. 17.🧭 A robot spins 60° every second. How many seconds does it take to turn 360°?
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
19. 19.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
20. 20.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
21. 21.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
23. 23.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
24. 24.🧭 A robot should turn right 45°, but its gyro shows it turned 54°. How many degrees must it turn back to the left?
25. 25.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is hot (d) black is loud
26. 26.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the right sensor (c) between the two sensors (d) under the left sensor
27. 27.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a camera (c) a sound sensor (d) a gyro sensor
28. 28.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
29. 29.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
30. 30.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) harder to balance (d) too fast on floors
31. 31.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
32. 32.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
33. 33.True or false: “crossing stepping-stones” suits legs. (a) False (b) True
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🧭 A robot should turn right 45°, but its gyro shows it turned 34°. How many degrees must it turn more to the right?
37. 37.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
38. 38.🔍 Which sensor helps a robot spot a red ball? (a) a temperature sensor (b) a gyro sensor (c) a camera (d) a touch sensor
39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
40. 40.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) faster and weaker (c) not at all (d) at the same speed

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