Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 140 · 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.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 3 cm (d) 34 cm
2. 2.Which job needs a distance sensor? (a) measure how far a box is (b) find the brightest spot (c) follow a black line (d) spot a red ball
3. 3.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 74. What is under the sensor? (a) the black line (b) the white floor
4. 4.📡 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)?
5. 5.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
6. 6.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
7. 7.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points up and right (c) points up and left (d) points left
8. 8.🦾 A servo program runs:
   angle = 130
   angle = angle − 10
   angle = angle − 40
   angle = angle + 60
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
9. 9.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
10. 10.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 39 seconds (in cm)?
11. 11.🔍 Which sensor helps a robot know a button is pressed? (a) a gyro sensor (b) a distance sensor (c) a camera (d) a touch sensor
12. 12.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
13. 13.True or false: to feel a bump into a wall, use a sound sensor. (a) True (b) False
14. 14.⚙️ A motor makes 140 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
15. 15.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
16. 16.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
17. 17.True or false: to spot a red ball, use a camera. (a) False (b) True
18. 18.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 56. What is under the sensor? (a) the black line (b) the white floor
19. 19.True or false: to know a button is pressed, use a temperature sensor. (a) False (b) True
20. 20.⚙️ A motor makes 350 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
21. 21.⚙️ A 15-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
22. 22.🔍 Which sensor helps a robot find the brightest spot? (a) a distance sensor (b) a gyro sensor (c) a light sensor (d) a temperature sensor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
24. 24.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
25. 25.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) bright light (d) radio music
26. 26.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
27. 27.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.Which of these suits wheels? (a) loose sand dunes (b) soft snow (c) moving under water (d) a smooth classroom floor
29. 29.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
30. 30.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
31. 31.Which of these suits propellers? (a) soft snow (b) a flat road (c) flying over a field (d) stepping over wide gaps
32. 32.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
33. 33.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
34. 34.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
35. 35.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 360° (c) 180° (d) 45°
36. 36.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
38. 38.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
39. 39.True or false: “a field of tall boulders” suits legs. (a) False (b) True
40. 40.True or false: to stop before a wall, use a distance sensor. (a) False (b) True

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