Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 47 · 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 muddy building site” suits propellers. (a) False (b) True
2. 2.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
4. 4.📡 A robot is 130 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 3 seconds (in cm)?
5. 5.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 80. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
7. 7.🧭 A robot faces north. It does: turn around, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
8. 8.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) propellers (c) legs (d) tracks
9. 9.⚙️ A motor makes 500 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
10. 10.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 65. What is under the sensor? (a) the black line (b) the white floor
11. 11.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
12. 12.🧭 A robot should turn right 90°, but its gyro shows it turned 84°. How many degrees must it turn more to the right?
13. 13.📡 A robot is 210 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
14. 14.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
15. 15.Which job needs a gyro sensor? (a) stay balanced upright (b) measure how far a box is (c) find the brightest spot (d) spot a red ball
16. 16.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
17. 17.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a bat (c) a cow (d) a goldfish
19. 19.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
20. 20.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
21. 21.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its radius (d) its circumference
22. 22.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 180° (d) 360°
23. 23.Which of these suits propellers? (a) a long factory floor (b) loose sand dunes (c) stepping over wide gaps (d) moving under water
24. 24.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 42. What is under the sensor? (a) the black line (b) the white floor
25. 25.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is hot (c) black soaks up light (d) black is loud
26. 26.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
27. 27.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) white (d) black
28. 28.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a touch sensor (c) a distance sensor (d) a gyro sensor
29. 29.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
30. 30.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points right (b) points up and right (c) points straight up (d) points up and left
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
33. 33.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
34. 34.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
35. 35.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the right sensor (c) far behind it (d) under the left sensor
36. 36.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
37. 37.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
38. 38.📡 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)?
39. 39.📡 A robot is 150 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 8 seconds (in cm)?
40. 40.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids