Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 172 · 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.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its weight (d) its radius
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) spins left on the spot (d) turns right
3. 3.📡 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)?
4. 4.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
5. 5.⚙️ An 8-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
6. 6.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) wheels (c) propellers (d) tracks
7. 7.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) propellers (c) legs (d) tracks
8. 8.⚙️ A 16-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
9. 9.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
12. 12.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
13. 13.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 80. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
15. 15.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a touch sensor (c) a temperature sensor (d) a gyro sensor
16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.🔍 What does a gyro sensor measure? (a) temperature (b) colour (c) sound (d) turning (rotation)
19. 19.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle − 30
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 37. What is under the sensor? (a) the black line (b) the white floor
22. 22.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
23. 23.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
24. 24.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
25. 25.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) propellers (c) tracks (d) wheels
26. 26.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
27. 27.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
28. 28.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
29. 29.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle − 60
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
31. 31.Which job needs a touch sensor? (a) start on a hand clap (b) measure a turn angle (c) feel a bump into a wall (d) hear a whistle
32. 32.⚙️ 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
33. 33.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 18. What is under the sensor? (a) the white floor (b) the black line
34. 34.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a black surface (c) a dark tunnel (d) a white surface
35. 35.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 61. What is under the sensor? (a) the black line (b) the white floor
36. 36.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) one wheel runs faster (c) it jumps (d) it uses a sail
37. 37.🔍 Which sensor helps a robot stay balanced upright? (a) a temperature sensor (b) a gyro sensor (c) a camera (d) a touch sensor
38. 38.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) far behind it (c) under the right sensor (d) under the left sensor
39. 39.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.🔍 Which sensor helps a robot measure how far a box is? (a) a light sensor (b) a distance sensor (c) a camera (d) a touch sensor

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