Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 184 · 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 30 over a black line and above 30 over the white floor. It reads 42. What is under the sensor? (a) the black line (b) the white floor
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
3. 3.True or false: to start on a hand clap, use a light sensor. (a) False (b) True
4. 4.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) propellers (c) wheels (d) tracks
5. 5.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
6. 6.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it uses a sail (c) one wheel runs faster (d) it jumps
7. 7.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns left (b) stays still (c) goes straight back (d) turns right
8. 8.📡 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?
9. 9.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) wheels (c) legs (d) propellers
10. 10.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its radius (d) its circumference
11. 11.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.🔍 Which sensor helps a robot measure a turn angle? (a) a sound sensor (b) a light sensor (c) a gyro sensor (d) a temperature sensor
13. 13.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) black (d) white
14. 14.🧭 A robot should turn right 45°, but its gyro shows it turned 59°. How many degrees must it turn back to the left?
15. 15.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points left (c) points straight up (d) points up and left
16. 16.🧭 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 0°. It turns left 30°, then left 60°, then left 90°. What does the gyro read now (0° to 359°)?
17. 17.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
19. 19.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 34 cm (d) 3 cm
21. 21.Which of these suits propellers? (a) deep mud (b) a flat road (c) hovering over a roof (d) a muddy building site
22. 22.🛞 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)? =
23. 23.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a servo (c) a track (d) a gear
24. 24.True or false: “a flat road” suits tracks. (a) False (b) True
25. 25.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
26. 26.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
27. 27.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
29. 29.📡 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)?
30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
32. 32.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) at the same speed (c) faster and weaker (d) not at all
33. 33.📡 A robot is 220 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 1 second (in cm)?
34. 34.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) propellers (c) tracks (d) legs
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
36. 36.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
37. 37.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
38. 38.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
40. 40.Which of these suits wheels? (a) a smooth classroom floor (b) a muddy building site (c) moving under water (d) soft snow

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