Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 483 · 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.🔢 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
2. 2.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) driver gear (c) tyre (d) idler gear
4. 4.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
5. 5.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
6. 6.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
7. 7.🧭 A robot faces west. It does: turn right, turn right, turn around, turn left. Which way does it face now? (a) north (b) south (c) east (d) west
8. 8.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.📡 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)?
11. 11.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 20. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
13. 13.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
14. 14.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 25. What is under the sensor? (a) the black line (b) the white floor
15. 15.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor
16. 16.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.📡 A robot is 300 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 23 seconds (in cm)?
18. 18.🦾 A servo moves from 50° to 0°. How many degrees does it turn?
19. 19.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) number of gears (d) motor volts
20. 20.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
21. 21.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
22. 22.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.Which of these suits legs? (a) a hospital corridor (b) a long factory floor (c) crossing stepping-stones (d) flying over a field
24. 24.Which job needs a light sensor? (a) measure a turn angle (b) measure how far a box is (c) start on a hand clap (d) find the brightest spot
25. 25.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
26. 26.🛞 Circumference = π × … (a) speed (b) radius only (c) weight (d) diameter
27. 27.⚙️ A motor makes 440 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?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
29. 29.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 3 (c) 1 (d) 4
30. 30.True or false: to feel a bump into a wall, use a sound sensor. (a) True (b) False
31. 31.True or false: to stay balanced upright, use a light sensor. (a) False (b) True
32. 32.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
33. 33.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
34. 34.🔍 Which sensor helps a robot measure how far a box is? (a) a camera (b) a sound sensor (c) a touch sensor (d) a distance sensor
35. 35.Which job needs a sound sensor? (a) measure a turn angle (b) hear a whistle (c) know a button is pressed (d) find the brightest spot
36. 36.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
37. 37.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
38. 38.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) backwards (c) slower (d) nowhere
39. 39.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a light sensor (c) a touch sensor (d) a camera
40. 40.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?

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