Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 342 · 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.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 34 cm (d) 3 cm
2. 2.Which of these suits tracks? (a) moving under water (b) a long factory floor (c) a muddy building site (d) a smooth classroom floor
3. 3.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
4. 4.Which job needs a touch sensor? (a) hear a whistle (b) stop before a wall (c) follow a black line (d) feel a bump into a wall
5. 5.🔍 Which sensor helps a robot stop before a wall? (a) a gyro sensor (b) a light sensor (c) a distance sensor (d) a camera
6. 6.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
7. 7.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times bigger (d) 3 times slower
8. 8.🔍 Why do robots need sensors? (a) to use more power (b) to be heavier (c) to look colourful (d) to know their world
9. 9.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
11. 11.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 25. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
12. 12.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
13. 13.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
14. 14.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns left 45°, then left 90°, then left 90°. What does the gyro read now (0° to 359°)?
15. 15.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) wheels (c) legs (d) propellers
16. 16.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
17. 17.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 13 seconds (in cm)?
18. 18.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?
19. 19.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 90°. It turns right 180°, then left 60°. What does the gyro read now (0° to 359°)?
20. 20.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
21. 21.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) harder to balance (c) they never tire (d) too fast on floors
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 1100 cm?
25. 25.True or false: “soft snow” suits tracks. (a) False (b) True
26. 26.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) pins (c) tyres (d) teeth
27. 27.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
28. 28.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 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
30. 30.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
31. 31.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) propellers (c) wheels (d) tracks
32. 32.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
33. 33.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) legs (c) wheels (d) tracks
34. 34.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
35. 35.⚙️ A motor makes 180 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
36. 36.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
37. 37.True or false: to warn if motors get hot, use a temperature sensor. (a) False (b) True
38. 38.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is wet (d) black is loud
39. 39.🔍 Which sensor helps a robot feel a bump into a wall? (a) a temperature sensor (b) a touch sensor (c) a distance sensor (d) a sound sensor
40. 40.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small

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