Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 118 · 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.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
2. 2.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 7/22 (c) 22/7 (d) 2/7
3. 3.📡 A robot is 240 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
4. 4.True or false: to stay balanced upright, use a gyro sensor. (a) True (b) False
5. 5.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) faster (c) backwards (d) slower
6. 6.True or false: to follow a black line, use a light sensor. (a) False (b) True
7. 7.True or false: to spot a red ball, use a touch sensor. (a) False (b) True
8. 8.⬛ The threshold of a light sensor is … (a) the battery size (b) the wheel size (c) the top speed (d) the black/white cut-off
9. 9.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
10. 10.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
11. 11.True or false: “a hospital corridor” suits propellers. (a) True (b) False
12. 12.🛞 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) goes straight back (b) turns left (c) stays still (d) spins right on the spot
13. 13.🔍 Which sensor helps a robot feel a bump into a wall? (a) a gyro sensor (b) a distance sensor (c) a camera (d) a touch sensor
14. 14.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) a wheel (d) an input
15. 15.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they are shiny (c) they spin in the air (d) they spread the weight
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
17. 17.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
18. 18.Which job needs a sound sensor? (a) hear a whistle (b) find the brightest spot (c) stop before a wall (d) stay balanced upright
19. 19.True or false: to hear a whistle, use a light sensor. (a) True (b) False
20. 20.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
21. 21.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
22. 22.🧭 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 right 45°, then left 45°. What does the gyro read now (0° to 359°)?
23. 23.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its diameter (d) its circumference
24. 24.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
25. 25.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster and weaker
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
27. 27.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
28. 28.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🧭 A robot should turn right 180°, but its gyro shows it turned 175°. How many degrees must it turn more to the right?
30. 30.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
31. 31.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
32. 32.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
34. 34.True or false: to start on a hand clap, use a temperature sensor. (a) True (b) False
35. 35.🛞 Why do most indoor robots use wheels? (a) they look funny (b) fast and easy on floors (c) they float (d) they climb stairs
36. 36.True or false: “a smooth classroom floor” suits propellers. (a) True (b) False
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 95. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
38. 38.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
39. 39.🔍 Which sensor helps a robot measure how far a box is? (a) a temperature sensor (b) a distance sensor (c) a camera (d) a gyro sensor
40. 40.🦾 A servo moves from 110° to 90°. How many degrees does it turn?

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