Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 503 · 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 motor makes 150 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
2. 2.⚙️ 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
3. 3.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
4. 4.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
5. 5.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
6. 6.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
7. 7.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the battery size (d) the black/white cut-off
8. 8.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 2 (d) 1
9. 9.⚙️ A motor makes 40 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
10. 10.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 82. What is under the sensor? (a) the black line (b) the white floor
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
12. 12.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
13. 13.🧭 A robot should turn right 45°, but its gyro shows it turned 30°. How many degrees must it turn more to the right?
14. 14.🔍 Which sensor helps a robot measure how far a box is? (a) a distance sensor (b) a touch sensor (c) a camera (d) a light sensor
15. 15.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.True or false: “the output is weaker” happens when a small gear drives a big one. (a) True (b) False
17. 17.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its circumference (d) its weight
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 20. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
21. 21.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a sound sensor (c) a touch sensor (d) a light sensor
22. 22.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
23. 23.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 43. What is under the sensor? (a) the black line (b) the white floor
24. 24.Which of these suits wheels? (a) a muddy building site (b) crossing stepping-stones (c) deep mud (d) a hospital corridor
25. 25.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 3 cm (c) 340 cm (d) 34 cm
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
27. 27.⚙️ A motor makes 210 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
28. 28.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
29. 29.📡 A robot is 180 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 12 seconds (in cm)?
30. 30.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 80. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
32. 32.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) see colours (c) smell smoke (d) hear claps
33. 33.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 45° (c) 360° (d) 90°
35. 35.True or false: to hear a whistle, use a camera. (a) True (b) False
36. 36.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 50 times. How many times does the driven gear turn?
37. 37.🔍 Which sensor helps a robot stay balanced upright? (a) a light sensor (b) a temperature sensor (c) a gyro sensor (d) a sound sensor
38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
39. 39.Which of these suits legs? (a) deep mud (b) moving under water (c) crossing stepping-stones (d) hovering over a roof
40. 40.True or false: “a flat road” suits wheels. (a) False (b) True

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