Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 934 · 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.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
2. 2.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
3. 3.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
4. 4.True or false: to spot a red ball, use a camera. (a) False (b) True
5. 5.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
6. 6.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 17. What is under the sensor? (a) the black line (b) the white floor
7. 7.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
8. 8.🔍 Which sensor helps a robot measure a turn angle? (a) a temperature sensor (b) a camera (c) a touch sensor (d) a gyro sensor
9. 9.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
10. 10.📡 A robot is 290 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
11. 11.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
12. 12.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
13. 13.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
15. 15.🛞 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?
16. 16.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) a wheel (d) an output
18. 18.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
19. 19.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
20. 20.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
21. 21.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 42. What is under the sensor? (a) the white floor (b) the black line
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.🔍 Which sensor helps a robot find the brightest spot? (a) a temperature sensor (b) a light sensor (c) a camera (d) a sound sensor
24. 24.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) faster but weaker (c) not at all (d) at the same speed
25. 25.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 26. What is under the sensor? (a) the black line (b) the white floor
27. 27.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) big (slow and strong) (d) never important
28. 28.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
29. 29.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they spread the weight (c) they are shiny (d) they are round
30. 30.⚙️ A motor makes 100 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
31. 31.True or false: “soft snow” suits propellers. (a) False (b) True
32. 32.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
33. 33.🛞 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 forward. What does the robot do? (a) spins left on the spot (b) turns left (c) turns right (d) goes straight back
34. 34.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a camera
35. 35.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 22. What is under the sensor? (a) the black line (b) the white floor
36. 36.⬛ 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
37. 37.🔍 Which sensor helps a robot hear a whistle? (a) a camera (b) a temperature sensor (c) a touch sensor (d) a sound sensor
38. 38.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.Which of these suits propellers? (a) a hospital corridor (b) a long factory floor (c) a muddy building site (d) moving under water
40. 40.Which of these suits tracks? (a) hovering over a roof (b) crossing stepping-stones (c) a field of tall boulders (d) loose sand dunes

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