Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 351 · 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 20 over black and 60 over white. A good threshold is halfway between them. What is it?
2. 2.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🛞 Circumference = π × … (a) diameter (b) speed (c) radius only (d) weight
4. 4.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) tracks (c) wheels (d) propellers
5. 5.Which job needs a gyro sensor? (a) warn if motors get hot (b) start on a hand clap (c) measure a turn angle (d) find the brightest spot
6. 6.🦾 A servo program runs:
   angle = 180
   angle = angle − 40
   angle = angle − 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
7. 7.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) the sensor is half (c) sound is slow (d) it goes there and back
8. 8.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
9. 9.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
10. 10.⚙️ 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
11. 11.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) faster (c) slower (d) nowhere
12. 12.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
13. 13.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 85. What is under the sensor? (a) the black line (b) the white floor
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 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
15. 15.📡 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) No (b) Yes
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.True or false: to read a QR code, use a distance sensor. (a) False (b) True
19. 19.📡 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)?
20. 20.Which job needs a touch sensor? (a) read a QR code (b) find the brightest spot (c) spot a red ball (d) feel a bump into a wall
21. 21.Which of these suits propellers? (a) soft snow (b) a flat road (c) hovering over a roof (d) a muddy building site
22. 22.Which job needs a light sensor? (a) start on a hand clap (b) find the brightest spot (c) hear a whistle (d) warn if motors get hot
23. 23.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) see colours (c) smell smoke (d) hear claps
25. 25.Which job needs a sound sensor? (a) find the brightest spot (b) feel a bump into a wall (c) stay balanced upright (d) hear a whistle
26. 26.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
27. 27.⚙️ A motor makes 320 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
28. 28.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 2/7 (d) 22/7
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
32. 32.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
33. 33.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🧭 A robot spins 45° every second. How many seconds does it take to turn 45°?
35. 35.🧭 A robot should turn right 45°, but its gyro shows it turned 48°. How many degrees must it turn back to the left?
36. 36.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
37. 37.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
38. 38.Which of these suits wheels? (a) stepping over wide gaps (b) a long factory floor (c) a field of tall boulders (d) moving under water
39. 39.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 60. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor

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