Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 207 · 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.Which of these suits wheels? (a) moving under water (b) hovering over a roof (c) crossing stepping-stones (d) a flat road
2. 2.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
3. 3.🛞 Circumference = π × … (a) radius only (b) diameter (c) speed (d) weight
4. 4.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.Which job needs a temperature sensor? (a) measure a turn angle (b) hear a whistle (c) warn if motors get hot (d) spot a red ball
6. 6.Which job needs a camera? (a) know a button is pressed (b) read a QR code (c) measure how far a box is (d) measure a turn angle
7. 7.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
8. 8.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 23. What is under the sensor? (a) the white floor (b) the black line
9. 9.True or false: “flying over a field” suits propellers. (a) True (b) False
10. 10.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
12. 12.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
14. 14.🛞 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 backward. What does the robot do? (a) goes straight forward (b) stays still (c) turns right (d) goes straight back
15. 15.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
16. 16.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 360° (d) 90°
17. 17.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
18. 18.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
19. 19.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a temperature sensor (c) a touch sensor (d) a sound sensor
20. 20.🧭 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 135°, then right 120°, then left 60°. What does the gyro read now (0° to 359°)?
21. 21.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 4 (c) 3 (d) 2
22. 22.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
23. 23.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
24. 24.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
25. 25.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.Which job needs a light sensor? (a) know a button is pressed (b) follow a black line (c) hear a whistle (d) spot a red ball
28. 28.📡 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
29. 29.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.Which job needs a camera? (a) spot a red ball (b) find the brightest spot (c) know a button is pressed (d) measure a turn angle
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.📡 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)?
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
37. 37.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
38. 38.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
39. 39.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True

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