Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 556 · 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 30 over black and 60 over white. A good threshold is halfway between them. What is it?
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
4. 4.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) tyre (d) driver gear
5. 5.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
6. 6.True or false: “a muddy building site” suits tracks. (a) False (b) True
7. 7.🧭 How many degrees is a full turn? (a) 360° (b) 180° (c) 100° (d) 90°
8. 8.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 360° (d) 180°
9. 9.⚙️ 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
10. 10.True or false: “a muddy building site” suits legs. (a) False (b) True
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
12. 12.🛞 Which way of moving suits this best: “moving under water”? (a) propellers (b) tracks (c) wheels (d) legs
13. 13.🔍 Which sensor helps a robot measure a turn angle? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a light sensor
14. 14.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
16. 16.🧭 A robot faces east. It does: turn left, turn right, turn right, turn around. Which way does it face now? (a) east (b) west (c) south (d) north
17. 17.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
18. 18.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 49. What is under the sensor? (a) the white floor (b) the black line
19. 19.Which job needs a sound sensor? (a) spot a red ball (b) follow a black line (c) measure a turn angle (d) hear a whistle
20. 20.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) tracks (c) legs (d) wheels
21. 21.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
22. 22.True or false: “a smooth classroom floor” suits propellers. (a) True (b) False
23. 23.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
24. 24.📡 A robot is 190 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 16 seconds (in cm)?
25. 25.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to be heavier (d) to know their world
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 35. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
27. 27.Which job needs a distance sensor? (a) stop before a wall (b) follow a black line (c) feel a bump into a wall (d) find the brightest spot
28. 28.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°
29. 29.📡 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)?
30. 30.🛞 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) turns left (b) spins right on the spot (c) stays still (d) spins left on the spot
31. 31.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spread the weight (d) they spin in the air
32. 32.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.True or false: to measure a turn angle, use a gyro sensor. (a) True (b) False
34. 34.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
35. 35.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
36. 36.📡 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?
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 20
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
40. 40.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise

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