Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 213 · 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 arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points straight up (b) points up and left (c) points right (d) points up and right
2. 2.⬛ A reading below the threshold means the sensor is over … (a) white (b) black (c) the sky (d) water
3. 3.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
4. 4.🦾 A servo moves from 80° to 50°. How many degrees does it turn?
5. 5.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
6. 6.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) water drops (c) sound too high to hear (d) bright light
7. 7.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a black line (d) a white surface
8. 8.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
9. 9.True or false: “a field of tall boulders” suits legs. (a) False (b) True
10. 10.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
11. 11.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a gyro sensor (c) a camera (d) a touch sensor
12. 12.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.🛞 Circumference = π × … (a) diameter (b) speed (c) weight (d) radius only
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 360° (c) 90° (d) 45°
17. 17.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a wheel (c) a gear (d) an output
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
19. 19.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
20. 20.Which of these suits legs? (a) a flat road (b) deep mud (c) hovering over a roof (d) crossing stepping-stones
21. 21.🧭 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 45°, then left 45°. What does the gyro read now (0° to 359°)?
22. 22.🛞 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) spins right on the spot (c) turns right (d) spins left on the spot
23. 23.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
24. 24.True or false: to find the brightest spot, use a sound sensor. (a) True (b) False
25. 25.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times bigger (d) 3 times faster
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
28. 28.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) wheel size (d) motor volts
29. 29.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) teeth (c) pins (d) tyres
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
31. 31.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 65. What is under the sensor? (a) the black line (b) the white floor
32. 32.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 21. What is under the sensor? (a) the black line (b) the white floor
34. 34.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 12 seconds (in cm)?
35. 35.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
36. 36.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle − 10
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.True or false: to know a button is pressed, use a light sensor. (a) True (b) False
39. 39.📡 A robot is 210 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 11 seconds (in cm)?
40. 40.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?

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