Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 420 · 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 robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
3. 3.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
5. 5.🛞 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) curves to the right (b) curves to the left (c) goes straight forward
6. 6.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a goldfish (d) a bat
7. 7.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
8. 8.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
9. 9.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) an input (d) a gear
13. 13.True or false: “flying over a field” suits propellers. (a) False (b) True
14. 14.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
15. 15.Which job needs a light sensor? (a) measure a turn angle (b) measure how far a box is (c) hear a whistle (d) follow a black line
16. 16.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 73. What is under the sensor? (a) the black line (b) the white floor
17. 17.📡 A robot is 200 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 27 seconds (in cm)?
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
19. 19.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
20. 20.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
21. 21.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) legs (c) tracks (d) wheels
22. 22.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
23. 23.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
24. 24.⚙️ A motor makes 240 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
25. 25.🛞 Circumference = π × … (a) diameter (b) speed (c) weight (d) radius only
26. 26.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
27. 27.⚙️ 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 small driver gear (b) a big driver gear
28. 28.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) teeth (c) tyres (d) pins
29. 29.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.🔍 Which sensor helps a robot measure how far a box is? (a) a light sensor (b) a sound sensor (c) a gyro sensor (d) a distance sensor
31. 31.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
32. 32.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight back (b) stays still (c) turns left (d) turns right
33. 33.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🧭 A robot should turn right 45°, but its gyro shows it turned 33°. How many degrees must it turn more to the right?
35. 35.📡 A robot is 190 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
36. 36.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.True or false: “soft snow” suits wheels. (a) False (b) True
38. 38.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
39. 39.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan

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