Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 551 · 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 light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
2. 2.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 90° (d) 360°
3. 3.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.📡 A robot is 250 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 44 seconds (in cm)?
6. 6.True or false: “a muddy building site” suits tracks. (a) False (b) True
7. 7.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
8. 8.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
10. 10.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
11. 11.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
12. 12.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
13. 13.⚙️ A motor makes 150 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
14. 14.Which job needs a gyro sensor? (a) measure how far a box is (b) stop before a wall (c) know a button is pressed (d) measure a turn angle
15. 15.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) tyre (d) driven gear
16. 16.True or false: to spot a red ball, use a distance sensor. (a) True (b) False
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 95. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
18. 18.True or false: “flying over a field” suits propellers. (a) False (b) True
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
20. 20.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
21. 21.🦾 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 straight up (c) points left (d) points up and right
22. 22.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) small (fast, weak) (c) never important (d) zero
23. 23.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
24. 24.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🔦 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
26. 26.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
27. 27.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
28. 28.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times louder (d) 3 times slower
29. 29.🧭 A robot should turn right 45°, but its gyro shows it turned 48°. How many degrees must it turn back to the left?
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
31. 31.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 9. What is under the sensor? (a) the white floor (b) the black line
32. 32.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
33. 33.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a soft foam cushion (d) a metal door
34. 34.🔍 Which sensor helps a robot start on a hand clap? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
35. 35.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) legs (c) propellers (d) wheels
36. 36.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
37. 37.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) bright light (c) radio music (d) water drops
38. 38.⚙️ 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
39. 39.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.Which of these suits legs? (a) stepping over wide gaps (b) loose sand dunes (c) a hospital corridor (d) a flat road

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