Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 305 · 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.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
2. 2.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) black (d) water
3. 3.🔍 Which sensor helps a robot hear a whistle? (a) a distance sensor (b) a touch sensor (c) a light sensor (d) a sound sensor
4. 4.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
5. 5.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
6. 6.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spin in the air (c) they are round (d) they spread the weight
8. 8.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
9. 9.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
10. 10.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to use more power (d) to look colourful
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
13. 13.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
14. 14.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
15. 15.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a gyro sensor (c) a touch sensor (d) a light sensor
16. 16.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a light sensor (c) a camera (d) a distance sensor
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.⚙️ A motor makes 40 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
19. 19.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
20. 20.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) radio music (d) sound too high to hear
21. 21.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) not at all (c) faster but weaker (d) at the same speed
22. 22.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 90° (d) 360°
23. 23.Which of these suits wheels? (a) a smooth classroom floor (b) a muddy building site (c) crossing stepping-stones (d) soft snow
24. 24.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black soaks up light (c) black is loud (d) black is hot
25. 25.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) under the right sensor (c) far behind it (d) between the two sensors
26. 26.🧭 A robot spins 30° every second. How many seconds does it take to turn 240°?
27. 27.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
28. 28.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🧭 What does a gyro help a robot do? (a) smell smoke (b) turn by exact angles (c) see colours (d) hear claps
30. 30.⚙️ 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
31. 31.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
33. 33.🛞 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 15 times. How far does the robot roll (in cm)?
34. 34.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
35. 35.🧭 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 90°. It turns right 90°, then right 30°. What does the gyro read now (0° to 359°)?
36. 36.📡 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?
37. 37.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 45° (d) 360°
38. 38.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
39. 39.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
40. 40.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?

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