Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 732 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
2. 2.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
3. 3.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
4. 4.🦾 A servo moves from 90° to 50°. How many degrees does it turn?
5. 5.⬛ The threshold of a light sensor is … (a) the wheel size (b) the black/white cut-off (c) the top speed (d) the battery size
6. 6.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
8. 8.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
9. 9.⚙️ A 20-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
10. 10.True or false: to hear a whistle, use a gyro sensor. (a) True (b) False
11. 11.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) tracks (c) legs (d) propellers
12. 12.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
13. 13.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
15. 15.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
16. 16.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
17. 17.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
18. 18.🔍 Which sensor helps a robot find the brightest spot? (a) a distance sensor (b) a touch sensor (c) a light sensor (d) a camera
19. 19.True or false: to follow a black line, use a light sensor. (a) False (b) True
20. 20.True or false: to measure a turn angle, use a gyro sensor. (a) False (b) True
21. 21.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) never important (d) big (slow and strong)
22. 22.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
25. 25.📡 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)?
26. 26.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 2/7 (c) 22 (d) 7/22
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
28. 28.🛞 Circumference = π × … (a) radius only (b) weight (c) speed (d) diameter
29. 29.True or false: to stop before a wall, use a distance sensor. (a) True (b) False
30. 30.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 180° (d) 360°
31. 31.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) number of gears (d) motor volts
32. 32.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
33. 33.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) turns left (b) turns right (c) spins left on the spot (d) stays still
35. 35.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
36. 36.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
37. 37.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
38. 38.⚙️ A motor makes 180 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
39. 39.🧭 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 30°, then left 135°. What does the gyro read now (0° to 359°)?
40. 40.🔍 Which sensor helps a robot hear a whistle? (a) a sound sensor (b) a touch sensor (c) a camera (d) a distance sensor

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