Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 510 · 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 way of moving suits this best: “stepping over wide gaps”? (a) legs (b) propellers (c) wheels (d) tracks
2. 2.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
3. 3.🛞 Circumference = π × … (a) diameter (b) radius only (c) weight (d) speed
4. 4.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
6. 6.📡 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) No (b) Yes
7. 7.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
8. 8.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
9. 9.🛞 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 back (b) goes straight forward (c) spins right on the spot (d) turns left
10. 10.Which of these suits wheels? (a) hovering over a roof (b) deep mud (c) a smooth classroom floor (d) stepping over wide gaps
11. 11.🔍 Which sensor helps a robot start on a hand clap? (a) a touch sensor (b) a sound sensor (c) a temperature sensor (d) a camera
12. 12.Which of these suits tracks? (a) stepping over wide gaps (b) flying over a field (c) crossing stepping-stones (d) deep mud
13. 13.⚙️ An 8-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
15. 15.🛞 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 left (b) goes straight forward (c) curves to the right
16. 16.Which job needs a temperature sensor? (a) stop before a wall (b) find the brightest spot (c) warn if motors get hot (d) start on a hand clap
17. 17.True or false: to measure a turn angle, use a gyro sensor. (a) False (b) True
18. 18.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its radius (d) its circumference
19. 19.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
21. 21.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
22. 22.Which job needs a light sensor? (a) measure a turn angle (b) follow a black line (c) know a button is pressed (d) spot a red ball
23. 23.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 22 (c) 2/7 (d) 7/22
24. 24.Which job needs a gyro sensor? (a) follow a black line (b) hear a whistle (c) know a button is pressed (d) measure a turn angle
25. 25.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
26. 26.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
27. 27.🛞 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
28. 28.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
29. 29.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are shiny (c) they spread the weight (d) they are round
30. 30.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
31. 31.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
32. 32.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
33. 33.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
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 0°. It turns right 30°, then right 90°. What does the gyro read now (0° to 359°)?
35. 35.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
37. 37.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
38. 38.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 3 (d) 2
39. 39.⚙️ A motor makes 20 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?

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