Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 248 · 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 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)?
2. 2.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
3. 3.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) one up, one down (d) the same direction
5. 5.Which job needs a distance sensor? (a) spot a red ball (b) stop before a wall (c) stay balanced upright (d) warn if motors get hot
6. 6.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
7. 7.True or false: “deep mud” suits propellers. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 67. What is under the sensor? (a) the black line (b) the white floor
10. 10.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
11. 11.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) black (d) white
12. 12.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.🧭 A robot should turn right 45°, but its gyro shows it turned 39°. How many degrees must it turn more to the right?
15. 15.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
16. 16.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
18. 18.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) fast and easy on floors (c) they float (d) they look funny
19. 19.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 43. What is under the sensor? (a) the white floor (b) the black line
20. 20.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) it jumps (d) one wheel runs faster
21. 21.🧭 A robot should turn right 45°, but its gyro shows it turned 36°. How many degrees must it turn more to the right?
22. 22.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) not at all (c) faster but weaker (d) slower but stronger
23. 23.⬛ 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
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
25. 25.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 2 (d) 3
26. 26.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) stays still (b) turns right (c) spins right on the spot (d) spins left on the spot
27. 27.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🛞 Which way of moving suits this best: “hovering over a roof”? (a) wheels (b) propellers (c) legs (d) tracks
29. 29.Which job needs a sound sensor? (a) know a button is pressed (b) start on a hand clap (c) stay balanced upright (d) warn if motors get hot
30. 30.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 51. What is under the sensor? (a) the black line (b) the white floor
31. 31.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.Which job needs a touch sensor? (a) read a QR code (b) find the brightest spot (c) warn if motors get hot (d) know a button is pressed
33. 33.🔍 Which sensor helps a robot measure a turn angle? (a) a gyro sensor (b) a camera (c) a distance sensor (d) a sound sensor
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
36. 36.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
37. 37.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
38. 38.🧭 A robot spins 45° every second. How many seconds does it take to turn 225°?
39. 39.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
40. 40.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big

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