Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 335 · 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 robot keeps turning right by 30° at a time. How many turns make one full circle?
2. 2.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) spokes (d) teeth
3. 3.🧭 A robot spins 30° every second. How many seconds does it take to turn 270°?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 30. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) propellers (c) tracks (d) legs
7. 7.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
8. 8.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
9. 9.🧭 A robot faces north. It does: turn right, turn left. Which way does it face now? (a) east (b) west (c) south (d) north
10. 10.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
11. 11.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
12. 12.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
13. 13.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
14. 14.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
15. 15.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.Which job needs a temperature sensor? (a) spot a red ball (b) warn if motors get hot (c) follow a black line (d) start on a hand clap
17. 17.📡 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 1 second (in cm)?
18. 18.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 30. What is under the sensor? (a) the black line (b) the white floor
19. 19.📡 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?
20. 20.🧭 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 180°. It turns right 180°, then right 120°, then right 30°. What does the gyro read now (0° to 359°)?
21. 21.⚙️ A motor makes 160 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
22. 22.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a touch sensor (c) a distance sensor (d) a temperature sensor
23. 23.Which of these suits wheels? (a) moving under water (b) soft snow (c) a hospital corridor (d) flying over a field
24. 24.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) not at all (c) slower but stronger (d) faster but weaker
25. 25.🦾 A servo moves from 140° to 90°. How many degrees does it turn?
26. 26.🧭 A robot spins 15° every second. How many seconds does it take to turn 150°?
27. 27.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 95. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
29. 29.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
30. 30.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
31. 31.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
32. 32.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black soaks up light (d) black is wet
34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
37. 37.🛞 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)? =
38. 38.Which job needs a touch sensor? (a) follow a black line (b) know a button is pressed (c) read a QR code (d) measure how far a box is
39. 39.🧭 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 180°. It turns left 30°, then left 60°. What does the gyro read now (0° to 359°)?
40. 40.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?

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