Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 202 · 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 light sensor reads below 40 over a black line and above 40 over the white floor. It reads 34. What is under the sensor? (a) the white floor (b) the black line
2. 2.⚙️ A motor makes 400 turns a minute with a 15-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
3. 3.🔍 Which sensor helps a robot know a button is pressed? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a touch sensor
4. 4.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
5. 5.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
6. 6.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
7. 7.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) legs (b) wheels (c) propellers (d) tracks
8. 8.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
9. 9.🧭 A robot should turn right 180°, but its gyro shows it turned 179°. How many degrees must it turn more to the right?
10. 10.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 69. What is under the sensor? (a) the black line (b) the white floor
11. 11.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
12. 12.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
13. 13.🧭 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 left 180°, then right 120°. What does the gyro read now (0° to 359°)?
14. 14.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) legs (b) tracks (c) propellers (d) wheels
15. 15.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its radius (d) its circumference
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
18. 18.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
19. 19.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) small (fast, weak) (d) never important
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
21. 21.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
23. 23.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
24. 24.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
25. 25.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a light sensor (c) a distance sensor (d) a touch sensor
26. 26.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) sound too high to hear (d) radio music
27. 27.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
28. 28.📡 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)?
29. 29.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
30. 30.⚙️ The gear fixed to the motor is called the … (a) tyre (b) idler gear (c) driver gear (d) driven gear
31. 31.📡 A robot is 240 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
32. 32.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times faster (d) 3 times bigger
33. 33.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 75. What is under the sensor? (a) the white floor (b) the black line
35. 35.🛞 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 back (b) turns right (c) goes straight forward (d) spins left on the spot
36. 36.🧭 How many degrees is a right-angle turn? (a) 45° (b) 360° (c) 90° (d) 180°
37. 37.🔦 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) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
38. 38.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
39. 39.True or false: to follow a black line, use a touch sensor. (a) False (b) True
40. 40.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 3 cm (d) 1 km

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