Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 714 · 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.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) too fast on floors (c) they never tire (d) they are too cheap
2. 2.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🛞 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) turns right (b) goes straight back (c) stays still (d) spins left on the spot
4. 4.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
5. 5.📡 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)?
6. 6.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) wheels (c) tracks (d) legs
7. 7.🦾 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 right (b) points straight up (c) points up and right (d) points left
8. 8.⚙️ A motor makes 60 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
9. 9.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
10. 10.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a camera
11. 11.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
12. 12.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
15. 15.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a temperature sensor (c) a light sensor (d) a gyro sensor
16. 16.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
18. 18.🦾 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 up and right (d) points left
19. 19.Which job needs a touch sensor? (a) warn if motors get hot (b) spot a red ball (c) feel a bump into a wall (d) stop before a wall
20. 20.True or false: “a smooth classroom floor” suits wheels. (a) False (b) True
21. 21.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) in opposite directions (c) the same direction (d) one up, one down
22. 22.🔦 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 white floor (b) the black line
23. 23.🧭 A robot should turn right 45°, but its gyro shows it turned 44°. How many degrees must it turn more to the right?
24. 24.Which of these suits tracks? (a) a smooth classroom floor (b) loose sand dunes (c) stepping over wide gaps (d) a flat road
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
26. 26.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
27. 27.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times faster (d) 3 times louder
28. 28.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
29. 29.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
30. 30.Which of these suits propellers? (a) crossing stepping-stones (b) a flat road (c) a field of tall boulders (d) moving under water
31. 31.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
32. 32.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a temperature sensor (c) a camera (d) a distance sensor
33. 33.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
35. 35.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a touch sensor (c) a camera (d) a distance sensor
36. 36.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they spread the weight (d) they are shiny
37. 37.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.📡 A robot is 150 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
39. 39.True or false: “a smooth classroom floor” suits propellers. (a) True (b) False
40. 40.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) between the two sensors (c) under the left sensor (d) far behind it

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