Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 196 · 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: “a flat road” suits wheels. (a) False (b) True
2. 2.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 29. What is under the sensor? (a) the black line (b) the white floor
3. 3.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
4. 4.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a goldfish (c) a snail (d) a cow
5. 5.Which of these suits wheels? (a) loose sand dunes (b) hovering over a roof (c) crossing stepping-stones (d) a long factory floor
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) neither sensor (d) the left sensor
7. 7.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times slower (c) 3 times bigger (d) 3 times faster
8. 8.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
9. 9.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
11. 11.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.🛞 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) goes straight back (b) stays still (c) spins left on the spot (d) turns left
13. 13.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 90° (d) 180°
14. 14.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 340 cm (d) 3 cm
15. 15.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
16. 16.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
20. 20.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 65. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
22. 22.⚙️ 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
23. 23.Which job needs a distance sensor? (a) spot a red ball (b) hear a whistle (c) feel a bump into a wall (d) measure how far a box is
24. 24.True or false: “flying over a field” suits legs. (a) True (b) False
25. 25.🧭 A robot spins 15° every second. How many seconds does it take to turn 225°?
26. 26.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
27. 27.🦾 A servo program runs:
    angle = 120
    angle = angle + 30
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
29. 29.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
30. 30.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
31. 31.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
32. 32.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a distance sensor (c) a gyro sensor (d) a light sensor
33. 33.🛞 Which way of moving suits this best: “a hospital corridor”? (a) wheels (b) propellers (c) tracks (d) legs
34. 34.Which job needs a gyro sensor? (a) measure a turn angle (b) stop before a wall (c) find the brightest spot (d) know a button is pressed
35. 35.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
36. 36.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its circumference (c) its diameter (d) its weight
37. 37.🧭 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 90°. It turns left 120°, then left 45°. What does the gyro read now (0° to 359°)?
38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 40
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 2 seconds (in cm)?

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