Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 739 · 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: “has a signal wire” is true of a servo motor. (a) False (b) True
2. 2.🦾 A servo program runs:
   angle = 160
   angle = angle − 20
   angle = angle + 30
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
4. 4.Which job needs a touch sensor? (a) find the brightest spot (b) know a button is pressed (c) stay balanced upright (d) follow a black line
5. 5.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
6. 6.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
9. 9.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black line (d) a black surface
10. 10.⬛ A reading below the threshold means the sensor is over … (a) water (b) black (c) the sky (d) white
11. 11.🔍 Which sensor helps a robot find the brightest spot? (a) a camera (b) a sound sensor (c) a light sensor (d) a temperature sensor
12. 12.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
13. 13.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) spokes (c) teeth (d) tyres
14. 14.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
15. 15.📡 A robot is 260 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
16. 16.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) not at all (c) faster but weaker (d) at the same speed
17. 17.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 12. What is under the sensor? (a) the black line (b) the white floor
18. 18.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) temperature (d) turning (rotation)
19. 19.True or false: “a field of tall boulders” suits propellers. (a) True (b) False
20. 20.🧭 A robot faces west. It does: turn around, turn right, turn left. Which way does it face now? (a) east (b) west (c) south (d) north
21. 21.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a camera (c) a temperature sensor (d) a sound sensor
24. 24.⚙️ An 8-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
25. 25.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
26. 26.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
28. 28.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
30. 30.Which of these suits propellers? (a) a flat road (b) soft snow (c) deep mud (d) flying over a field
31. 31.⚙️ A 10-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
33. 33.📡 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?
34. 34.🛞 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)? =
35. 35.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) under the right sensor (d) far behind it
36. 36.🔍 Which sensor helps a robot read a QR code? (a) a camera (b) a touch sensor (c) a distance sensor (d) a light sensor
37. 37.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.🧭 A robot spins 15° every second. How many seconds does it take to turn 135°?
39. 39.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
40. 40.🦾 A servo moves from 0° to 140°. How many degrees does it turn?

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