Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 545 · 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 reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
2. 2.Which of these suits wheels? (a) a muddy building site (b) a hospital corridor (c) stepping over wide gaps (d) deep mud
3. 3.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points up and left (c) points up and right (d) points left
4. 4.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
5. 5.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is hot (d) black is loud
6. 6.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 3 cm (d) 34 cm
7. 7.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spread the weight (d) they spin in the air
8. 8.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns right (b) goes straight back (c) spins right on the spot (d) turns left
9. 9.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a track (c) a caster wheel (d) a servo
10. 10.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
11. 11.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
13. 13.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) motor volts (c) wheel size (d) number of gears
14. 14.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
15. 15.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a temperature sensor (c) a camera (d) a gyro sensor
16. 16.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 35 times. How many times does the driven gear turn?
17. 17.True or false: “a field of tall boulders” 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 180°. Where does the arm point? (a) points straight up (b) points right (c) points up and left (d) points left
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 4 times (in cm)? =
20. 20.⚙️ A motor makes 40 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
21. 21.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
22. 22.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
23. 23.🛞 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) turns left (b) stays still (c) goes straight forward (d) goes straight back
24. 24.Which job needs a sound sensor? (a) feel a bump into a wall (b) hear a whistle (c) warn if motors get hot (d) measure a turn angle
25. 25.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) slower but stronger (d) not at all
26. 26.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
27. 27.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
28. 28.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
31. 31.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
32. 32.🛞 Which way of moving suits this best: “flying over a field”? (a) propellers (b) legs (c) wheels (d) tracks
33. 33.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) wheels (c) propellers (d) tracks
34. 34.Which of these suits tracks? (a) a smooth classroom floor (b) crossing stepping-stones (c) hovering over a roof (d) deep mud
35. 35.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
36. 36.True or false: “flying over a field” suits legs. (a) True (b) False
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.⚙️ 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
39. 39.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes

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