Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 36 · 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 light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
3. 3.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
4. 4.🛞 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) spins right on the spot (b) goes straight forward (c) goes straight back (d) turns right
5. 5.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
6. 6.📡 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?
7. 7.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
9. 9.🧭 How many degrees is a full turn? (a) 100° (b) 90° (c) 360° (d) 180°
10. 10.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
12. 12.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 62. What is under the sensor? (a) the white floor (b) the black line
13. 13.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a goldfish (d) a bat
14. 14.Which of these suits legs? (a) crossing stepping-stones (b) deep mud (c) flying over a field (d) a hospital corridor
15. 15.True or false: “deep mud” suits wheels. (a) True (b) False
16. 16.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
17. 17.Which of these suits legs? (a) soft snow (b) a long factory floor (c) a field of tall boulders (d) loose sand dunes
18. 18.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
19. 19.🧭 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 270°. It turns left 30°, then left 120°. What does the gyro read now (0° to 359°)?
20. 20.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
22. 22.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) legs (c) wheels (d) tracks
23. 23.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
24. 24.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) wheels (c) tracks (d) propellers
25. 25.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
26. 26.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
27. 27.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
28. 28.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a black line (d) a white surface
29. 29.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
30. 30.Which of these suits tracks? (a) hovering over a roof (b) a flat road (c) deep mud (d) a hospital corridor
31. 31.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
32. 32.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
33. 33.Which job needs a sound sensor? (a) hear a whistle (b) stop before a wall (c) measure a turn angle (d) warn if motors get hot
34. 34.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
35. 35.⚙️ 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
36. 36.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
37. 37.🔍 What does a gyro sensor measure? (a) sound (b) temperature (c) turning (rotation) (d) colour
38. 38.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
39. 39.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 19. What is under the sensor? (a) the black line (b) the white floor
40. 40.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line

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