Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 898 · 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 servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points straight up (b) points up and left (c) points right (d) points up and right
2. 2.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
4. 4.📡 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)?
5. 5.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 22 (c) 7/22 (d) 22/7
6. 6.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
7. 7.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
8. 8.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
10. 10.Which of these suits tracks? (a) crossing stepping-stones (b) a smooth classroom floor (c) a hospital corridor (d) a muddy building site
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🧭 A robot should turn right 90°, but its gyro shows it turned 102°. How many degrees must it turn back to the left?
13. 13.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
14. 14.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
15. 15.🔍 Which sensor helps a robot start on a hand clap? (a) a light sensor (b) a camera (c) a sound sensor (d) a gyro sensor
16. 16.🛞 Which way of moving suits this best: “moving under water”? (a) legs (b) propellers (c) wheels (d) tracks
17. 17.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) turns right (b) stays still (c) spins left on the spot (d) turns left
18. 18.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
19. 19.🧭 How many degrees is a full turn? (a) 360° (b) 180° (c) 100° (d) 90°
20. 20.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
21. 21.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) teeth (c) pins (d) spokes
22. 22.True or false: “moving under water” suits wheels. (a) False (b) True
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
25. 25.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) hear claps (d) turn by exact angles
27. 27.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
29. 29.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a distance sensor (c) a gyro sensor (d) a touch sensor
30. 30.⚙️ A motor makes 160 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?
31. 31.Which of these suits tracks? (a) loose sand dunes (b) a hospital corridor (c) a long factory floor (d) hovering over a roof
32. 32.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
33. 33.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
34. 34.🔍 Which sensor helps a robot warn if motors get hot? (a) a touch sensor (b) a gyro sensor (c) a temperature sensor (d) a camera
35. 35.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) legs (c) tracks (d) wheels
36. 36.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) backwards (c) slower (d) nowhere
37. 37.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 90° (c) 45° (d) 360°
38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
40. 40.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True

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