Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 670 · 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.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) spins left on the spot (b) goes straight forward (c) stays still (d) turns left
3. 3.🛞 Which way of moving suits this best: “deep mud”? (a) legs (b) tracks (c) wheels (d) propellers
4. 4.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
5. 5.⚙️ A motor makes 60 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
6. 6.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a track (c) a caster wheel (d) a gear
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
8. 8.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) at the same speed (c) not at all (d) slower but stronger
9. 9.🔍 Which sensor helps a robot find the brightest spot? (a) a light sensor (b) a touch sensor (c) a gyro sensor (d) a distance sensor
10. 10.Which job needs a touch sensor? (a) know a button is pressed (b) find the brightest spot (c) read a QR code (d) measure how far a box is
11. 11.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
12. 12.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
13. 13.🦾 A servo moves from 140° to 30°. How many degrees does it turn?
14. 14.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
16. 16.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
17. 17.🛞 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)?
18. 18.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) tyres (c) pins (d) teeth
19. 19.📡 An object is 238 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 has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 85. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
21. 21.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.🧭 A robot spins 60° every second. How many seconds does it take to turn 240°?
23. 23.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
25. 25.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 61. What is under the sensor? (a) the black line (b) the white floor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.Which of these suits wheels? (a) soft snow (b) loose sand dunes (c) a long factory floor (d) deep mud
29. 29.📡 A robot is 170 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 13 seconds (in cm)?
30. 30.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and right (b) points right (c) points left (d) points up and left
31. 31.🔍 Which sensor helps a robot warn if motors get hot? (a) a light sensor (b) a camera (c) a temperature sensor (d) a touch sensor
32. 32.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
33. 33.🧭 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 90°. It turns right 30°, then left 180°. What does the gyro read now (0° to 359°)?
34. 34.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it stops for ever (c) it uses a sail (d) it jumps
35. 35.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) propellers (c) tracks (d) legs
36. 36.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🔍 Which sensor helps a robot follow a black line? (a) a sound sensor (b) a touch sensor (c) a camera (d) a light sensor
39. 39.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor

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