Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 330 · 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: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
2. 2.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
4. 4.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) far behind it (d) under the right sensor
5. 5.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size
6. 6.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.🛞 Circumference = π × … (a) speed (b) weight (c) diameter (d) radius only
8. 8.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 34. What is under the sensor? (a) the white floor (b) the black line
9. 9.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they float (c) they look funny (d) fast and easy on floors
10. 10.⚙️ A 75-tooth driver gear turns a 15-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
11. 11.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) nowhere (d) backwards
12. 12.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
14. 14.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
15. 15.True or false: to warn if motors get hot, use a temperature sensor. (a) False (b) True
16. 16.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
17. 17.True or false: “a long factory floor” suits wheels. (a) False (b) True
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.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 31. What is under the sensor? (a) the black line (b) the white floor
20. 20.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
21. 21.📡 Why do we halve the echo’s total path? (a) sound is slow (b) it goes there and back (c) the sensor is half (d) to make it smaller
22. 22.🧭 A robot spins 30° every second. How many seconds does it take to turn 120°?
23. 23.True or false: “deep mud” suits wheels. (a) False (b) True
24. 24.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) a wheel (d) an input
25. 25.🧭 A robot faces east. It does: turn right, turn left. Which way does it face now? (a) west (b) east (c) north (d) south
26. 26.🔦 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
27. 27.📡 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) No (b) Yes
28. 28.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
29. 29.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
30. 30.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
31. 31.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
32. 32.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
33. 33.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
34. 34.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
35. 35.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
37. 37.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 77. What is under the sensor? (a) the black line (b) the white floor
38. 38.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
39. 39.📡 A robot is 150 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)?
40. 40.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?

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