Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 254 · 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.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
2. 2.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
3. 3.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a light sensor (c) a touch sensor (d) a distance sensor
4. 4.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 90° (d) 180°
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 924 cm?
6. 6.Which job needs a sound sensor? (a) find the brightest spot (b) follow a black line (c) start on a hand clap (d) spot a red ball
7. 7.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a camera (c) a temperature sensor (d) a gyro sensor
9. 9.📡 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?
10. 10.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
11. 11.⚙️ A motor makes 150 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
12. 12.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
14. 14.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
16. 16.📡 A robot is 240 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 11 seconds (in cm)?
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
18. 18.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
19. 19.🛞 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
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
21. 21.🧭 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 left 30°, then right 120°, then left 60°. What does the gyro read now (0° to 359°)?
22. 22.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
23. 23.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
24. 24.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it stops for ever (d) it uses a sail
25. 25.True or false: “a flat road” suits wheels. (a) False (b) True
26. 26.🛞 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)? =
27. 27.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a black surface (d) a white surface
28. 28.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 3 cm (d) 1 km
30. 30.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
31. 31.⚙️ A motor makes 350 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
32. 32.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) tyre (c) driven gear (d) driver gear
33. 33.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
34. 34.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle + 10
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
36. 36.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a gyro sensor (c) a temperature sensor (d) a distance sensor
37. 37.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times faster (d) 3 times bigger
39. 39.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
40. 40.🦾 A servo moves from 160° to 80°. How many degrees does it turn?

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