Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 407 · 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 robot spins 45° every second. How many seconds does it take to turn 90°?
2. 2.🔍 Which sensor helps a robot hear a whistle? (a) a camera (b) a light sensor (c) a sound sensor (d) a touch sensor
3. 3.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) legs (c) propellers (d) tracks
4. 4.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
5. 5.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
6. 6.🧭 A robot faces south. It does: turn left, turn right, turn around, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
7. 7.⚙️ 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
8. 8.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
9. 9.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
10. 10.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
11. 11.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
12. 12.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a light sensor (c) a camera (d) a sound sensor
14. 14.🔍 Which sensor helps a robot read a QR code? (a) a distance sensor (b) a sound sensor (c) a gyro sensor (d) a camera
15. 15.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
16. 16.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
17. 17.🧭 How many degrees is a right-angle turn? (a) 90° (b) 180° (c) 45° (d) 360°
18. 18.🧭 A robot should turn right 90°, but its gyro shows it turned 103°. How many degrees must it turn back to the left?
19. 19.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
20. 20.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 8. What is under the sensor? (a) the white floor (b) the black line
21. 21.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
22. 22.Which job needs a distance sensor? (a) measure a turn angle (b) measure how far a box is (c) find the brightest spot (d) follow a black line
23. 23.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
25. 25.🧭 A robot should turn right 45°, but its gyro shows it turned 43°. How many degrees must it turn more to the right?
26. 26.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
27. 27.🛞 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) turns left (b) stays still (c) turns right (d) spins left on the spot
28. 28.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
30. 30.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
31. 31.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
32. 32.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
34. 34.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
35. 35.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
36. 36.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
37. 37.🧭 A robot faces north. It does: turn around, turn around, turn around. Which way does it face now? (a) west (b) north (c) east (d) south
38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
39. 39.🔍 Which sensor helps a robot measure a turn angle? (a) a gyro sensor (b) a distance sensor (c) a touch sensor (d) a sound sensor
40. 40.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False

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