Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 958 · 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 34 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 turns a 16-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
3. 3.🧭 A robot spins 30° every second. How many seconds does it take to turn 360°?
4. 4.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
5. 5.🦾 A servo program runs:
   angle = 70
   angle = angle + 30
   angle = angle + 10
   angle = angle − 10
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
8. 8.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driver gear (c) driven gear (d) idler gear
9. 9.🔍 Which sensor helps a robot find the brightest spot? (a) a camera (b) a distance sensor (c) a touch sensor (d) a light sensor
10. 10.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
11. 11.True or false: to follow a black line, use a light sensor. (a) True (b) False
12. 12.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 360° (d) 100°
13. 13.⚙️ A motor makes 210 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
14. 14.🛞 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) goes straight forward (b) spins left on the spot (c) goes straight back (d) turns right
15. 15.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times louder (d) 3 times faster
16. 16.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
17. 17.Which of these suits tracks? (a) a muddy building site (b) moving under water (c) flying over a field (d) a smooth classroom floor
18. 18.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) legs (c) propellers (d) wheels
20. 20.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) spins left on the spot (b) turns right (c) spins right on the spot (d) stays still
21. 21.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 45° (d) 90°
22. 22.True or false: “a long factory floor” suits wheels. (a) False (b) True
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 75. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
25. 25.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
26. 26.🧭 A robot faces south. It does: turn left, turn left, turn left, turn left. Which way does it face now? (a) east (b) south (c) north (d) west
27. 27.🧭 A robot faces east. It does: turn around, turn left. Which way does it face now? (a) east (b) north (c) west (d) south
28. 28.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
29. 29.📡 A robot is 190 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 9 seconds (in cm)?
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
31. 31.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
32. 32.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 3 cm (d) 1 km
33. 33.Which of these suits wheels? (a) crossing stepping-stones (b) a smooth classroom floor (c) stepping over wide gaps (d) a field of tall boulders
34. 34.🧭 A robot should turn right 180°, but its gyro shows it turned 166°. How many degrees must it turn more to the right?
35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🧭 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 60°, then right 60°. What does the gyro read now (0° to 359°)?
37. 37.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a touch sensor (c) a temperature sensor (d) a sound sensor
40. 40.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) fast and easy on floors (d) they float

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