Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 220 · 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: “a hospital corridor”? (a) tracks (b) wheels (c) propellers (d) legs
2. 2.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
4. 4.🧭 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 180°. It turns left 30°, then right 60°. What does the gyro read now (0° to 359°)?
5. 5.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
6. 6.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
7. 7.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times bigger (d) 3 times faster
8. 8.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.True or false: “deep mud” suits tracks. (a) True (b) False
11. 11.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
12. 12.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
13. 13.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
14. 14.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) legs (b) wheels (c) tracks (d) propellers
15. 15.True or false: to read a QR code, use a touch sensor. (a) True (b) False
16. 16.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
17. 17.🔍 Which sensor helps a robot stop before a wall? (a) a temperature sensor (b) a camera (c) a sound sensor (d) a distance sensor
18. 18.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
20. 20.Which of these suits wheels? (a) a field of tall boulders (b) a muddy building site (c) soft snow (d) a smooth classroom floor
21. 21.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) they never tire (d) harder to balance
22. 22.📡 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) Yes (b) No
23. 23.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
24. 24.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
25. 25.🧭 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 180°, then right 180°, then left 120°. What does the gyro read now (0° to 359°)?
26. 26.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a bat (d) a goldfish
27. 27.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 53. What is under the sensor? (a) the white floor (b) the black line
28. 28.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 45° (d) 180°
29. 29.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
30. 30.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
31. 31.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1320 cm?
32. 32.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.🧭 A robot faces north. It does: turn left, turn right, turn right, turn right. Which way does it face now? (a) north (b) west (c) east (d) south
34. 34.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
35. 35.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
36. 36.Which of these suits tracks? (a) a flat road (b) flying over a field (c) deep mud (d) a long factory floor
37. 37.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a wheel (d) a gear
38. 38.Which job needs a light sensor? (a) follow a black line (b) measure a turn angle (c) stop before a wall (d) feel a bump into a wall
39. 39.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
40. 40.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 64. What is under the sensor? (a) the black line (b) the white floor

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