Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 597 · 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 feel a bump into a wall? (a) a sound sensor (b) a touch sensor (c) a gyro sensor (d) a light sensor
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
4. 4.⚙️ A 16-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
5. 5.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
6. 6.⚙️ A motor makes 60 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
7. 7.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) propellers (b) wheels (c) legs (d) tracks
8. 8.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
9. 9.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
10. 10.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
11. 11.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
12. 12.Which of these suits legs? (a) a muddy building site (b) a field of tall boulders (c) a flat road (d) deep mud
13. 13.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 50. What is under the sensor? (a) the white floor (b) the black line
14. 14.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) harder to balance (d) too fast on floors
15. 15.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
16. 16.📡 A robot is 250 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
17. 17.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
18. 18.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they look funny (c) they float (d) they climb stairs
19. 19.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
20. 20.📡 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?
21. 21.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
22. 22.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 100° (d) 90°
23. 23.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
24. 24.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
25. 25.Which of these suits propellers? (a) a hospital corridor (b) a smooth classroom floor (c) flying over a field (d) a field of tall boulders
26. 26.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) one wheel runs faster (d) it jumps
27. 27.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) tracks (c) wheels (d) propellers
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) turns right (b) goes straight back (c) goes straight forward (d) spins right on the spot
29. 29.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the right sensor (c) between the two sensors (d) under the left sensor
30. 30.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 17. What is under the sensor? (a) the black line (b) the white floor
31. 31.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
32. 32.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
33. 33.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
34. 34.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
35. 35.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
36. 36.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
37. 37.Which of these suits wheels? (a) flying over a field (b) crossing stepping-stones (c) a smooth classroom floor (d) a field of tall boulders
38. 38.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 180° (d) 360°
39. 39.🧭 A robot faces west. It does: turn right, turn around, turn right. Which way does it face now? (a) west (b) east (c) south (d) north
40. 40.🧭 A robot faces south. It does: turn left, turn right, turn right, turn right. Which way does it face now? (a) east (b) south (c) north (d) west

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