Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 532 · 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 distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
3. 3.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
4. 4.Which job needs a gyro sensor? (a) stop before a wall (b) hear a whistle (c) measure a turn angle (d) feel a bump into a wall
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
6. 6.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
8. 8.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
9. 9.📡 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?
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
11. 11.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) zero (c) small (fast, weak) (d) big (slow and strong)
12. 12.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
13. 13.⚙️ 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 small driver gear (b) a big driver gear
14. 14.⚙️ A 15-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
15. 15.🧭 A robot faces north. It does: turn around, turn left, turn left, turn left. Which way does it face now? (a) south (b) north (c) west (d) east
16. 16.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
17. 17.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
18. 18.🧭 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 0°. It turns left 180°, then left 45°. What does the gyro read now (0° to 359°)?
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
21. 21.🧭 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 180°, then left 45°. What does the gyro read now (0° to 359°)?
22. 22.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
23. 23.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and right (b) points right (c) points up and left (d) points left
24. 24.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
25. 25.🔍 Which sensor helps a robot read a QR code? (a) a temperature sensor (b) a light sensor (c) a touch sensor (d) a camera
26. 26.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
27. 27.True or false: to follow a black line, use a light sensor. (a) False (b) True
28. 28.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.Which job needs a sound sensor? (a) hear a whistle (b) follow a black line (c) know a button is pressed (d) find the brightest spot
30. 30.⚙️ A 16-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
31. 31.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.📡 A robot is 280 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 11 seconds (in cm)?
33. 33.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a touch sensor (c) a gyro sensor (d) a light sensor
35. 35.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) at the same speed (c) slower but stronger (d) not at all
36. 36.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
37. 37.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
38. 38.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
39. 39.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
40. 40.🛞 Which way of moving suits this best: “loose sand dunes”? (a) tracks (b) legs (c) propellers (d) wheels

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