Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 762 · 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.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a temperature sensor (c) a sound sensor (d) a touch sensor
2. 2.🛞 Circumference = π × … (a) weight (b) speed (c) diameter (d) radius only
3. 3.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
4. 4.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) propellers (c) legs (d) tracks
5. 5.🦾 A servo program runs:
   angle = 60
   angle = angle + 50
   angle = angle − 60
   angle = angle + 20
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.📡 A robot is 120 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
7. 7.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
8. 8.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
9. 9.⚙️ A motor makes 60 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
10. 10.⚙️ 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
11. 11.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
12. 12.⚙️ 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
13. 13.📡 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 16 seconds (in cm)?
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) a gear (d) an input
17. 17.🦾 A servo moves from 120° to 50°. How many degrees does it turn?
18. 18.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) propellers (c) tracks (d) legs
19. 19.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
20. 20.Which of these suits wheels? (a) crossing stepping-stones (b) deep mud (c) a muddy building site (d) a flat road
21. 21.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a cow (d) a snail
22. 22.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
23. 23.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
25. 25.Which job needs a touch sensor? (a) measure a turn angle (b) feel a bump into a wall (c) spot a red ball (d) start on a hand clap
26. 26.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
27. 27.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
28. 28.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
29. 29.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 360° (d) 90°
30. 30.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
32. 32.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) at the same speed (d) slower but stronger
33. 33.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
34. 34.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
35. 35.Which of these suits tracks? (a) moving under water (b) crossing stepping-stones (c) flying over a field (d) loose sand dunes
36. 36.🔍 What does a gyro sensor measure? (a) colour (b) turning (rotation) (c) sound (d) temperature
37. 37.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the wheel size (c) the battery size (d) the top speed
38. 38.🔍 Why do robots need sensors? (a) to be heavier (b) to use more power (c) to look colourful (d) to know their world
39. 39.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.True or false: “deep mud” suits tracks. (a) True (b) False

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