Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 760 · 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 robot keeps turning right by 120° at a time. How many turns make one full circle?
2. 2.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
3. 3.Which job needs a distance sensor? (a) read a QR code (b) measure how far a box is (c) spot a red ball (d) find the brightest spot
4. 4.⚙️ 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
5. 5.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a sound sensor (d) a touch sensor
6. 6.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
7. 7.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
8. 8.🛞 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
9. 9.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) teeth (c) pins (d) tyres
10. 10.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 35. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
11. 11.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
13. 13.⬛ 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 right sensor (d) under the left sensor
14. 14.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
15. 15.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
16. 16.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a bat (c) a cow (d) a goldfish
17. 17.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
19. 19.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
23. 23.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
24. 24.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points left (b) points up and left (c) points right (d) points straight up
26. 26.📡 A robot is 190 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 15 seconds (in cm)?
27. 27.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) too fast on floors (c) they are too cheap (d) they never tire
28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🧭 A robot should turn right 90°, but its gyro shows it turned 104°. How many degrees must it turn back to the left?
30. 30.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a sound sensor (c) a gyro sensor (d) a distance sensor
31. 31.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
32. 32.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 49. What is under the sensor? (a) the white floor (b) the black line
33. 33.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 35. What is under the sensor? (a) the white floor (b) the black line
34. 34.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
35. 35.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
36. 36.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
37. 37.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
40. 40.🛞 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?

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