Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 188 · 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.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 10. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
2. 2.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
4. 4.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
5. 5.Which job needs a gyro sensor? (a) follow a black line (b) warn if motors get hot (c) stay balanced upright (d) feel a bump into a wall
6. 6.⚙️ A motor makes 480 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
7. 7.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
8. 8.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
9. 9.📡 A robot is 160 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 15 seconds (in cm)?
10. 10.True or false: to find the brightest spot, use a temperature sensor. (a) True (b) False
11. 11.Which job needs a touch sensor? (a) stop before a wall (b) know a button is pressed (c) find the brightest spot (d) measure how far a box is
12. 12.🧭 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 right 90°, then right 60°. What does the gyro read now (0° to 359°)?
13. 13.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) under the left sensor (d) between the two sensors
14. 14.🧭 A robot spins 15° every second. How many seconds does it take to turn 270°?
15. 15.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 11. What is under the sensor? (a) the white floor (b) the black line
16. 16.🔦 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 white floor (b) the black line
17. 17.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
18. 18.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
19. 19.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) small (fast, weak) (d) big (slow and strong)
20. 20.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and left (b) points up and right (c) points left (d) points straight up
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
23. 23.🧭 A robot should turn right 45°, but its gyro shows it turned 41°. How many degrees must it turn more to the right?
24. 24.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
25. 25.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a goldfish (d) a bat
26. 26.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
27. 27.🧭 A robot spins 45° every second. How many seconds does it take to turn 270°?
28. 28.⚙️ A 16-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
29. 29.📡 A robot is 260 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
30. 30.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a light sensor (c) a temperature sensor (d) a camera
32. 32.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.⚙️ A 30-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
34. 34.🔍 Which sensor helps a robot measure how far a box is? (a) a sound sensor (b) a temperature sensor (c) a distance sensor (d) a touch sensor
35. 35.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
36. 36.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 21 times. How many times does the driven gear turn?
38. 38.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
39. 39.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
40. 40.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True

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