Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 444 · 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 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
2. 2.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
3. 3.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the left sensor (d) under the right sensor
4. 4.🔍 Which sensor helps a robot stay balanced upright? (a) a sound sensor (b) a gyro sensor (c) a camera (d) a light sensor
5. 5.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) wheels (c) propellers (d) legs
6. 6.🦾 A servo moves from 80° to 120°. How many degrees does it turn?
7. 7.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it jumps (c) one wheel runs faster (d) it uses a sail
8. 8.Which job needs a light sensor? (a) read a QR code (b) warn if motors get hot (c) follow a black line (d) feel a bump into a wall
9. 9.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 25. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
10. 10.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) legs (c) wheels (d) propellers
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
12. 12.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are shiny (c) they spin in the air (d) they are round
13. 13.True or false: to measure how far a box is, use a light sensor. (a) False (b) True
14. 14.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
15. 15.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a touch sensor (c) a distance sensor (d) a gyro sensor
16. 16.True or false: “a hospital corridor” suits propellers. (a) True (b) False
17. 17.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
18. 18.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.Which of these suits propellers? (a) a long factory floor (b) flying over a field (c) a smooth classroom floor (d) a muddy building site
20. 20.🧭 A robot faces west. It does: turn around, turn right, turn right. Which way does it face now? (a) east (b) west (c) north (d) south
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 270°. It turns right 135°, then right 90°. What does the gyro read now (0° to 359°)?
22. 22.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.Which of these suits legs? (a) a flat road (b) a hospital corridor (c) crossing stepping-stones (d) soft snow
24. 24.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a touch sensor (c) a camera (d) a sound sensor
25. 25.🛞 Which way of moving suits this best: “soft snow”? (a) wheels (b) propellers (c) legs (d) tracks
26. 26.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
27. 27.⚙️ A motor makes 60 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.📡 A robot is 110 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
30. 30.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
31. 31.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a distance sensor (c) a touch sensor (d) a light sensor
32. 32.📡 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)?
33. 33.🔦 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
34. 34.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) propellers (c) tracks (d) wheels
35. 35.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) spokes (c) pins (d) tyres
37. 37.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.🧭 A robot should turn right 90°, but its gyro shows it turned 82°. How many degrees must it turn more to the right?
39. 39.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its weight (c) its circumference (d) its diameter
40. 40.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False

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