Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 458 · 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 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 3 times. How far does the robot roll (in cm)?
2. 2.🦾 A servo program runs:
   angle = 150
   angle = angle − 30
   angle = angle − 10
   angle = angle − 60
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.True or false: “a smooth classroom floor” suits wheels. (a) False (b) True
4. 4.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
5. 5.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 7 seconds (in cm)?
7. 7.True or false: to warn if motors get hot, use a sound sensor. (a) True (b) False
8. 8.🦾 A servo moves from 100° to 140°. How many degrees does it turn?
9. 9.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
10. 10.🛞 Circumference = π × … (a) speed (b) diameter (c) weight (d) radius only
11. 11.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
12. 12.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
13. 13.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 25 times. How many times does the driven gear turn?
15. 15.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a touch sensor (c) a light sensor (d) a sound sensor
16. 16.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
17. 17.🧭 A robot spins 45° every second. How many seconds does it take to turn 180°?
18. 18.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times bigger (d) 3 times louder
19. 19.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
21. 21.🧭 A robot faces north. It does: turn left, turn right, turn left. Which way does it face now? (a) north (b) east (c) south (d) west
22. 22.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a camera
24. 24.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 41. What is under the sensor? (a) the black line (b) the white floor
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
27. 27.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 3 cm (d) 1 km
28. 28.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) pins (c) tyres (d) spokes
29. 29.🧭 A robot faces north. It does: turn right, turn around. Which way does it face now? (a) west (b) east (c) north (d) south
30. 30.📡 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
31. 31.True or false: to stop before a wall, use a light sensor. (a) True (b) False
32. 32.🔍 Which sensor helps a robot hear a whistle? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a distance sensor
33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
34. 34.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) water (d) the sky
35. 35.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22/7 (d) 22
36. 36.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
38. 38.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) propellers (c) wheels (d) legs
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 0°. It turns right 45°, then left 45°, then left 30°. What does the gyro read now (0° to 359°)?
40. 40.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?

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