Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 199 · 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.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
2. 2.Which job needs a camera? (a) spot a red ball (b) stop before a wall (c) measure a turn angle (d) start on a hand clap
3. 3.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) spins right on the spot (b) spins left on the spot (c) goes straight forward (d) goes straight back
4. 4.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 15. What is under the sensor? (a) the black line (b) the white floor
5. 5.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
6. 6.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
7. 7.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
8. 8.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it stops for ever (d) it jumps
9. 9.Which of these suits propellers? (a) a long factory floor (b) crossing stepping-stones (c) hovering over a roof (d) a smooth classroom floor
10. 10.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
11. 11.🛞 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 forward. What does the robot do? (a) goes straight forward (b) spins left on the spot (c) spins right on the spot (d) stays still
12. 12.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
13. 13.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they never tire (c) they are too cheap (d) too fast on floors
14. 14.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) bright light (d) water drops
15. 15.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
17. 17.⚙️ 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
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.⚙️ A motor makes 20 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?
20. 20.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) stays still (b) goes straight forward (c) turns right (d) spins left on the spot
21. 21.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
22. 22.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
23. 23.Which job needs a distance sensor? (a) stop before a wall (b) warn if motors get hot (c) know a button is pressed (d) measure a turn angle
24. 24.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
27. 27.🛞 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?
28. 28.🧭 A robot spins 30° every second. How many seconds does it take to turn 210°?
29. 29.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
30. 30.📡 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)?
31. 31.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
32. 32.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 34 cm (d) 1 km
33. 33.🔍 Which sensor helps a robot stop before a wall? (a) a gyro sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
34. 34.Which job needs a sound sensor? (a) spot a red ball (b) stay balanced upright (c) hear a whistle (d) measure a turn angle
35. 35.📡 A robot is 260 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
36. 36.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
38. 38.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a touch sensor
39. 39.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 73. What is under the sensor? (a) the black line (b) the white floor
40. 40.Which job needs a temperature sensor? (a) know a button is pressed (b) measure how far a box is (c) warn if motors get hot (d) stop before a wall

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