Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 113 · 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 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
2. 2.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) the sensor is half (c) to make it smaller (d) sound is slow
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 backward. What does the robot do? (a) goes straight back (b) goes straight forward (c) turns right (d) spins left on the spot
4. 4.🛞 Circumference = π × … (a) radius only (b) diameter (c) weight (d) speed
5. 5.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) far behind it (d) under the right sensor
6. 6.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) stays still (b) goes straight back (c) turns left (d) goes straight forward
7. 7.⚙️ A motor makes 120 turns a minute with a 15-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
8. 8.📡 A robot is 270 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)?
9. 9.Which job needs a light sensor? (a) warn if motors get hot (b) find the brightest spot (c) stay balanced upright (d) spot a red ball
10. 10.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and left (b) points straight up (c) points up and right (d) points left
11. 11.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) driver teeth (d) motor volts
12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
13. 13.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
14. 14.🔍 Which sensor helps a robot stop before a wall? (a) a camera (b) a gyro sensor (c) a touch sensor (d) a distance sensor
15. 15.Which of these suits wheels? (a) deep mud (b) a long factory floor (c) flying over a field (d) loose sand dunes
16. 16.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its radius (d) its weight
17. 17.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
18. 18.⚙️ 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
19. 19.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
20. 20.🔍 Which sensor helps a robot stay balanced upright? (a) a light sensor (b) a camera (c) a distance sensor (d) a gyro sensor
21. 21.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a touch sensor (c) a light sensor (d) a gyro sensor
22. 22.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
23. 23.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) one up, one down (d) they do not turn
24. 24.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
25. 25.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
27. 27.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
30. 30.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) tracks (c) wheels (d) legs
31. 31.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) wheels (c) legs (d) propellers
32. 32.True or false: “deep mud” suits propellers. (a) False (b) True
33. 33.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) at the same speed (c) faster but weaker (d) slower but stronger
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
36. 36.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
37. 37.Which of these suits legs? (a) a smooth classroom floor (b) hovering over a roof (c) a long factory floor (d) crossing stepping-stones
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
39. 39.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
40. 40.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 770 cm?

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