Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 307 · 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 distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) water drops (d) sound too high to hear
3. 3.True or false: “a hospital corridor” suits tracks. (a) True (b) False
4. 4.🛞 Circumference = π × … (a) diameter (b) speed (c) radius only (d) weight
5. 5.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 1 (c) 4 (d) 3
6. 6.📡 A robot is 100 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
7. 7.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
9. 9.🧭 A robot spins 45° every second. How many seconds does it take to turn 135°?
10. 10.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black surface (c) a dark tunnel (d) a black line
11. 11.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.🧭 A robot faces west. It does: turn left, turn around, turn around, turn right. Which way does it face now? (a) north (b) east (c) west (d) south
14. 14.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
16. 16.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 74. What is under the sensor? (a) the white floor (b) the black line
17. 17.True or false: “a flat road” suits wheels. (a) False (b) True
18. 18.Which of these suits propellers? (a) stepping over wide gaps (b) flying over a field (c) loose sand dunes (d) soft snow
19. 19.Which job needs a distance sensor? (a) know a button is pressed (b) follow a black line (c) hear a whistle (d) stop before a wall
20. 20.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a camera
21. 21.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
22. 22.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
24. 24.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 45. What is under the sensor? (a) the white floor (b) the black line
25. 25.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
26. 26.📡 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)?
27. 27.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 462 cm?
28. 28.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
29. 29.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.⚙️ A 15-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
31. 31.True or false: to measure a turn angle, use a light sensor. (a) True (b) False
32. 32.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
33. 33.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
34. 34.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 90° (c) 45° (d) 360°
35. 35.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) propellers (c) legs (d) wheels
36. 36.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 3 cm (d) 34 cm
37. 37.📡 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?
38. 38.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
39. 39.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
40. 40.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?

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