Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 236 · 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 servo moves from 90° to 70°. How many degrees does it turn?
2. 2.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
3. 3.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) not at all (c) slower but stronger (d) faster and weaker
4. 4.True or false: to follow a black line, use a light sensor. (a) False (b) True
5. 5.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
6. 6.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its weight (d) its radius
7. 7.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
8. 8.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) a wheel (c) an output (d) an input
9. 9.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 71. What is under the sensor? (a) the black line (b) the white floor
10. 10.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size
11. 11.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
13. 13.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
14. 14.⚙️ A motor makes 350 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
15. 15.📡 A robot is 260 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 12 seconds (in cm)?
16. 16.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
17. 17.Which of these suits tracks? (a) a long factory floor (b) soft snow (c) a flat road (d) crossing stepping-stones
18. 18.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) legs (c) wheels (d) tracks
19. 19.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) sound too high to hear (d) radio music
20. 20.🧭 A robot should turn right 180°, but its gyro shows it turned 194°. How many degrees must it turn back to the left?
21. 21.True or false: “stepping over wide gaps” suits legs. (a) False (b) True
22. 22.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
23. 23.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it uses a sail (c) it stops for ever (d) one wheel runs faster
24. 24.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.Which of these suits propellers? (a) flying over a field (b) crossing stepping-stones (c) loose sand dunes (d) a flat road
26. 26.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
29. 29.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
30. 30.📡 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)?
31. 31.Which job needs a touch sensor? (a) measure a turn angle (b) find the brightest spot (c) measure how far a box is (d) feel a bump into a wall
32. 32.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
33. 33.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22/7 (d) 22
34. 34.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle − 60
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
36. 36.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
37. 37.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
38. 38.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a light sensor (c) a gyro sensor (d) a sound sensor
39. 39.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
40. 40.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) driven gear (d) tyre

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