Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 406 · 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 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) it jumps (d) one wheel runs faster
3. 3.⬛ The threshold of a light sensor is … (a) the wheel size (b) the battery size (c) the black/white cut-off (d) the top speed
4. 4.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 330 cm?
5. 5.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its circumference (c) its weight (d) its diameter
7. 7.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
8. 8.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
9. 9.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a white surface (c) a black line (d) a dark tunnel
10. 10.🛞 Why do most indoor robots use wheels? (a) they float (b) they look funny (c) they climb stairs (d) fast and easy on floors
11. 11.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
14. 14.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
16. 16.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 25. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
17. 17.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) driver gear (c) idler gear (d) tyre
18. 18.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) teeth (d) spokes
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 90. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
22. 22.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
23. 23.🛞 Which way of moving suits this best: “a muddy building site”? (a) tracks (b) wheels (c) propellers (d) legs
24. 24.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
25. 25.🧭 How many degrees is a right-angle turn? (a) 45° (b) 360° (c) 90° (d) 180°
26. 26.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
27. 27.📡 A robot is 280 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 14 seconds (in cm)?
28. 28.Which of these suits wheels? (a) a muddy building site (b) a long factory floor (c) crossing stepping-stones (d) loose sand dunes
29. 29.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
30. 30.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
31. 31.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
32. 32.📡 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)?
33. 33.⚙️ 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
34. 34.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 270°. It turns right 60°, then right 120°, then left 135°. What does the gyro read now (0° to 359°)?
35. 35.True or false: “a hospital corridor” suits tracks. (a) False (b) True
36. 36.True or false: “hovering over a roof” suits propellers. (a) True (b) False
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) stays still (b) goes straight back (c) goes straight forward (d) turns right
38. 38.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
40. 40.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) propellers (c) legs (d) tracks

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