Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 816 · 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.🛞 Circumference = π × … (a) speed (b) weight (c) radius only (d) diameter
2. 2.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) water (d) white
4. 4.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
5. 5.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
6. 6.Which of these suits tracks? (a) a long factory floor (b) crossing stepping-stones (c) flying over a field (d) a muddy building site
7. 7.⚙️ A motor makes 270 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
9. 9.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.🛞 Which way of moving suits this best: “soft snow”? (a) tracks (b) propellers (c) wheels (d) legs
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
12. 12.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a bat (d) a cow
13. 13.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
14. 14.Which job needs a distance sensor? (a) know a button is pressed (b) measure how far a box is (c) read a QR code (d) warn if motors get hot
15. 15.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
16. 16.True or false: to stop before a wall, use a distance sensor. (a) True (b) False
17. 17.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
18. 18.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its weight (c) its diameter (d) its circumference
19. 19.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
20. 20.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster but weaker
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
22. 22.🛞 Which way of moving suits this best: “loose sand dunes”? (a) propellers (b) wheels (c) tracks (d) legs
23. 23.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) propellers (c) tracks (d) legs
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
26. 26.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 100° (d) 90°
27. 27.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 75. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
29. 29.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) spokes (d) teeth
30. 30.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
31. 31.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spin in the air (c) they spread the weight (d) they are round
32. 32.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times slower (d) 3 times louder
34. 34.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
35. 35.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a camera (c) a touch sensor (d) a distance sensor
36. 36.🧭 A robot should turn right 45°, but its gyro shows it turned 47°. How many degrees must it turn back to the left?
37. 37.Which job needs a light sensor? (a) spot a red ball (b) find the brightest spot (c) know a button is pressed (d) hear a whistle
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
40. 40.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?

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