Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 561 · 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.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
2. 2.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
3. 3.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a wheel (c) an output (d) a gear
4. 4.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 3 seconds (in cm)?
5. 5.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
6. 6.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
8. 8.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 67. What is under the sensor? (a) the white floor (b) the black line
9. 9.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
10. 10.🧭 A robot spins 15° every second. How many seconds does it take to turn 300°?
11. 11.Which of these suits propellers? (a) a long factory floor (b) a field of tall boulders (c) crossing stepping-stones (d) hovering over a roof
12. 12.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
13. 13.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
14. 14.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
15. 15.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) fast and easy on floors (d) they float
16. 16.🧭 A robot should turn right 45°, but its gyro shows it turned 35°. How many degrees must it turn more to the right?
17. 17.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) motor volts (d) number of gears
18. 18.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
19. 19.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
20. 20.🧭 A robot faces west. It does: turn right, turn right, turn around, turn around. Which way does it face now? (a) west (b) east (c) north (d) south
21. 21.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points straight up (b) points up and right (c) points left (d) points right
22. 22.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a cow (c) a bat (d) a snail
23. 23.Which job needs a distance sensor? (a) start on a hand clap (b) find the brightest spot (c) know a button is pressed (d) stop before a wall
24. 24.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
25. 25.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
26. 26.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) stays still (b) goes straight forward (c) turns right (d) spins right on the spot
27. 27.🔍 Which sensor helps a robot warn if motors get hot? (a) a light sensor (b) a temperature sensor (c) a camera (d) a distance sensor
28. 28.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🧭 A robot faces west. It does: turn around, turn left. Which way does it face now? (a) east (b) north (c) west (d) south
30. 30.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
31. 31.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
32. 32.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
33. 33.True or false: “moving under water” suits wheels. (a) True (b) False
34. 34.⚙️ 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 small driver gear (b) a big driver gear
35. 35.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its circumference (d) its weight
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
37. 37.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
38. 38.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
39. 39.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 85. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor

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