Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 2 · 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 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
2. 2.True or false: to warn if motors get hot, use a camera. (a) False (b) True
3. 3.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they are shiny (c) they spread the weight (d) they spin in the air
4. 4.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) smell smoke (c) hear claps (d) see colours
6. 6.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) propellers (c) wheels (d) tracks
7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
8. 8.True or false: “flying over a field” suits legs. (a) True (b) False
9. 9.📡 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)?
10. 10.🛞 Circumference = π × … (a) diameter (b) weight (c) speed (d) radius only
11. 11.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 45° (d) 360°
12. 12.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
13. 13.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
14. 14.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) propellers (c) tracks (d) legs
15. 15.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
16. 16.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
17. 17.🧭 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 left 60°, then left 135°, then right 90°. What does the gyro read now (0° to 359°)?
18. 18.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
20. 20.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) an output (d) a wheel
21. 21.🔍 Why do robots need sensors? (a) to be heavier (b) to use more power (c) to look colourful (d) to know their world
22. 22.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) tracks (c) propellers (d) wheels
23. 23.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
24. 24.🔍 What does a gyro sensor measure? (a) sound (b) temperature (c) turning (rotation) (d) colour
25. 25.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
26. 26.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) one up, one down (d) in opposite directions
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
28. 28.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
29. 29.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) faster but weaker (d) not at all
30. 30.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) under the left sensor (c) far behind it (d) between the two sensors
31. 31.⚙️ A motor makes 180 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
32. 32.📡 A robot is 130 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
33. 33.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
34. 34.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
35. 35.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
36. 36.True or false: “a long factory floor” suits tracks. (a) False (b) True
37. 37.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
38. 38.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.True or false: to start on a hand clap, use a sound sensor. (a) False (b) True
40. 40.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?

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