Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 651 · 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.🔍 What does a gyro sensor measure? (a) temperature (b) turning (rotation) (c) sound (d) colour
2. 2.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 69. What is under the sensor? (a) the black line (b) the white floor
3. 3.⚙️ 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
4. 4.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) turns left (c) turns right (d) stays still
5. 5.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its circumference (d) its weight
6. 6.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
8. 8.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.Which of these suits legs? (a) a hospital corridor (b) a muddy building site (c) hovering over a roof (d) stepping over wide gaps
10. 10.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black line (c) a dark tunnel (d) a black surface
11. 11.🔍 Which sensor helps a robot find the brightest spot? (a) a camera (b) a sound sensor (c) a light sensor (d) a touch sensor
12. 12.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
13. 13.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
14. 14.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
15. 15.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
16. 16.True or false: to hear a whistle, use a temperature sensor. (a) False (b) True
17. 17.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) spins right on the spot (b) spins left on the spot (c) goes straight forward (d) turns right
18. 18.🛞 Circumference = π × … (a) diameter (b) radius only (c) weight (d) speed
19. 19.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
20. 20.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) sound is slow (d) the sensor is half
21. 21.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) under the right sensor (d) far behind it
22. 22.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 10
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
24. 24.🧭 A robot should turn right 45°, but its gyro shows it turned 33°. How many degrees must it turn more to the right?
25. 25.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 1 (d) 3
26. 26.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.🔦 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) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
29. 29.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) wheels (c) propellers (d) tracks
30. 30.Which job needs a touch sensor? (a) follow a black line (b) find the brightest spot (c) feel a bump into a wall (d) read a QR code
31. 31.🛞 Which way of moving suits this best: “loose sand dunes”? (a) tracks (b) wheels (c) propellers (d) legs
32. 32.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
33. 33.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 550 cm?
34. 34.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
35. 35.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
36. 36.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
39. 39.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
40. 40.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) one up, one down (d) in opposite directions

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