Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 450 · 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 sensor helps a robot hear a whistle? (a) a light sensor (b) a camera (c) a sound sensor (d) a touch sensor
2. 2.True or false: “a field of tall boulders” suits legs. (a) False (b) True
3. 3.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a sound sensor (c) a touch sensor (d) a gyro sensor
4. 4.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
5. 5.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
6. 6.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) big (slow and strong) (c) never important (d) small (fast, weak)
7. 7.🧭 A robot spins 15° every second. How many seconds does it take to turn 330°?
8. 8.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 100° (d) 180°
9. 9.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
10. 10.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they spread the weight (d) they are shiny
11. 11.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
12. 12.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
13. 13.⚙️ A 12-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
14. 14.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
15. 15.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
16. 16.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
17. 17.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
18. 18.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
19. 19.True or false: to stay balanced upright, use a sound sensor. (a) True (b) False
20. 20.True or false: “a flat road” suits wheels. (a) False (b) True
21. 21.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
22. 22.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
26. 26.Which of these suits wheels? (a) loose sand dunes (b) hovering over a roof (c) crossing stepping-stones (d) a hospital corridor
27. 27.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
29. 29.Which of these suits legs? (a) deep mud (b) a long factory floor (c) a field of tall boulders (d) a flat road
30. 30.⚙️ A motor makes 120 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?
31. 31.📡 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?
32. 32.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
33. 33.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 48. What is under the sensor? (a) the black line (b) the white floor
34. 34.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
35. 35.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) driver teeth (d) motor volts
36. 36.Which of these suits propellers? (a) a muddy building site (b) a hospital corridor (c) soft snow (d) moving under water
37. 37.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) slower but stronger (c) faster but weaker (d) at the same speed
38. 38.True or false: “crossing stepping-stones” suits legs. (a) True (b) False
39. 39.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
40. 40.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 34 cm (c) 340 cm (d) 1 km

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