Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 716 · 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 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 forward (c) spins left on the spot (d) turns left
2. 2.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🧭 A robot should turn right 180°, but its gyro shows it turned 185°. How many degrees must it turn back to the left?
4. 4.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
5. 5.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
7. 7.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
8. 8.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
9. 9.Which job needs a sound sensor? (a) follow a black line (b) start on a hand clap (c) feel a bump into a wall (d) warn if motors get hot
10. 10.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
11. 11.⚙️ A 10-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
12. 12.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
13. 13.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
14. 14.⚙️ 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
15. 15.🧭 A robot faces east. It does: turn right, turn around, turn left, turn right. Which way does it face now? (a) south (b) east (c) north (d) west
16. 16.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a touch sensor
17. 17.⚙️ A 40-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
18. 18.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
19. 19.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
20. 20.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
21. 21.🛞 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) goes straight back (b) stays still (c) spins left on the spot (d) turns right
22. 22.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) propellers (c) wheels (d) legs
23. 23.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 15 seconds (in cm)?
24. 24.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) fast and easy on floors (d) they float
25. 25.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 20. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
26. 26.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
27. 27.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
28. 28.True or false: to stop before a wall, use a temperature sensor. (a) True (b) False
29. 29.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
30. 30.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
31. 31.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
32. 32.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 70. What is under the sensor? (a) the black line (b) the white floor
34. 34.🧭 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 270°. It turns right 30°, then left 120°, then left 135°. What does the gyro read now (0° to 359°)?
35. 35.True or false: to measure a turn angle, use a light sensor. (a) True (b) False
36. 36.True or false: to feel a bump into a wall, use a sound sensor. (a) True (b) False
37. 37.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a sound sensor (c) a camera (d) a gyro sensor
38. 38.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
39. 39.📡 A robot is 190 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 12 seconds (in cm)?
40. 40.🛞 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) spins left on the spot (b) turns right (c) goes straight forward (d) turns left

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