Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 324 · 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.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
2. 2.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 1 km (d) 3 cm
3. 3.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 180° (d) 360°
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.🧭 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 60°, then right 180°. What does the gyro read now (0° to 359°)?
6. 6.True or false: “flying over a field” suits propellers. (a) True (b) False
7. 7.Which job needs a gyro sensor? (a) warn if motors get hot (b) find the brightest spot (c) stop before a wall (d) stay balanced upright
8. 8.⚙️ A motor makes 270 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
9. 9.⚙️ A motor makes 80 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.Which of these suits tracks? (a) a field of tall boulders (b) stepping over wide gaps (c) a hospital corridor (d) soft snow
13. 13.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🔍 Which sensor helps a robot stop before a wall? (a) a temperature sensor (b) a light sensor (c) a distance sensor (d) a gyro sensor
15. 15.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) wheels (b) propellers (c) legs (d) tracks
16. 16.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the wheel size (d) the top speed
17. 17.Which of these suits wheels? (a) soft snow (b) a smooth classroom floor (c) a muddy building site (d) deep mud
18. 18.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 3 (d) 2
20. 20.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
22. 22.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
24. 24.🦾 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 up and right (b) points right (c) points up and left (d) points left
25. 25.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) driven gear (d) tyre
26. 26.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 20
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
28. 28.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) bright light (c) water drops (d) radio music
29. 29.📡 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)?
30. 30.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 63. What is under the sensor? (a) the white floor (b) the black line
31. 31.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
32. 32.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
33. 33.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
34. 34.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
35. 35.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
36. 36.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) they do not turn (d) in opposite directions
37. 37.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
38. 38.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) tracks (c) propellers (d) legs
39. 39.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 69. What is under the sensor? (a) the black line (b) the white floor
40. 40.🧭 A robot faces east. It does: turn around, turn left. Which way does it face now? (a) north (b) east (c) west (d) south

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids