Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 907 · 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.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
2. 2.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 65. What is under the sensor? (a) the black line (b) the white floor
3. 3.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) water (d) the sky
4. 4.🧭 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 180°. It turns right 180°, then left 135°. What does the gyro read now (0° to 359°)?
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
6. 6.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
7. 7.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) one wheel runs faster (d) it jumps
8. 8.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
9. 9.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.Which of these suits legs? (a) moving under water (b) a long factory floor (c) a flat road (d) a field of tall boulders
11. 11.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
12. 12.True or false: to feel a bump into a wall, use a gyro sensor. (a) True (b) False
13. 13.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
14. 14.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
15. 15.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a snail (d) a bat
16. 16.📡 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?
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
18. 18.True or false: to hear a whistle, use a sound sensor. (a) False (b) True
19. 19.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
20. 20.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
21. 21.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a white surface (d) a black surface
23. 23.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
25. 25.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
26. 26.Which job needs a temperature sensor? (a) warn if motors get hot (b) read a QR code (c) spot a red ball (d) know a button is pressed
27. 27.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
28. 28.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 25 times. How many times does the driven gear turn?
29. 29.🛞 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) turns left (b) turns right (c) spins left on the spot (d) goes straight forward
30. 30.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
31. 31.Which job needs a gyro sensor? (a) feel a bump into a wall (b) stay balanced upright (c) know a button is pressed (d) read a QR code
32. 32.⚙️ 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 small driver gear (b) a big driver gear
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
36. 36.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
38. 38.📡 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)?
39. 39.🧭 A robot faces south. It does: turn left, turn left. Which way does it face now? (a) west (b) north (c) south (d) east
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°

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