Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 854 · 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) too fast on floors (b) they never tire (c) they are too cheap (d) harder to balance
2. 2.Which job needs a distance sensor? (a) find the brightest spot (b) read a QR code (c) stop before a wall (d) start on a hand clap
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
4. 4.🦾 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 up and right (b) points straight up (c) points left (d) points right
5. 5.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22 (c) 22/7 (d) 7/22
6. 6.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
7. 7.🛞 Which way of moving suits this best: “hovering over a roof”? (a) wheels (b) tracks (c) legs (d) propellers
8. 8.⚙️ 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 big driver gear (b) a small driver gear
9. 9.⚙️ A 16-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
10. 10.🧭 A robot should turn right 90°, but its gyro shows it turned 98°. How many degrees must it turn back to the left?
11. 11.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
12. 12.Which job needs a temperature sensor? (a) spot a red ball (b) know a button is pressed (c) warn if motors get hot (d) stop before a wall
13. 13.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a gear (c) a servo (d) a track
14. 14.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
15. 15.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
16. 16.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.True or false: “soft snow” suits tracks. (a) False (b) True
18. 18.🦾 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 left (b) points left (c) points right (d) points up and right
19. 19.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
20. 20.🛞 Which way of moving suits this best: “a flat road”? (a) legs (b) tracks (c) propellers (d) wheels
21. 21.🧭 A robot spins 30° every second. How many seconds does it take to turn 300°?
22. 22.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a camera (c) a temperature sensor (d) a distance sensor
23. 23.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) smell smoke (c) hear claps (d) see colours
24. 24.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 5. What is under the sensor? (a) the black line (b) the white floor
25. 25.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 100° (d) 90°
26. 26.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
27. 27.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
28. 28.Which job needs a sound sensor? (a) stop before a wall (b) start on a hand clap (c) follow a black line (d) measure a turn angle
29. 29.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
30. 30.⚙️ A motor makes 150 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
31. 31.🛞 Which way of moving suits this best: “a muddy building site”? (a) tracks (b) wheels (c) propellers (d) legs
32. 32.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.📡 A robot is 130 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
34. 34.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
36. 36.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
37. 37.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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