Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 459 · 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: to read a QR code, use a temperature sensor. (a) False (b) True
2. 2.🧭 A robot faces north. It does: turn right, turn left, turn right. Which way does it face now? (a) north (b) east (c) south (d) west
3. 3.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they never tire (d) they are too cheap
4. 4.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
5. 5.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) wheels (c) legs (d) propellers
6. 6.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
8. 8.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 30. What is under the sensor? (a) the white floor (b) the black line
9. 9.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
10. 10.True or false: to follow a black line, use a light sensor. (a) False (b) True
11. 11.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 45° (d) 180°
12. 12.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
14. 14.⚙️ A motor makes 300 turns a minute with a 10-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
15. 15.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
16. 16.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.📡 A robot is 240 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 19 seconds (in cm)?
18. 18.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22 (d) 22/7
19. 19.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
20. 20.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
21. 21.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) stays still (c) turns left (d) spins right on the spot
22. 22.Which job needs a distance sensor? (a) follow a black line (b) find the brightest spot (c) stop before a wall (d) stay balanced upright
23. 23.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
24. 24.Which job needs a sound sensor? (a) start on a hand clap (b) read a QR code (c) stay balanced upright (d) measure a turn angle
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 45. What is under the sensor? (a) the white floor (b) the black line
26. 26.⚙️ 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
27. 27.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
28. 28.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
29. 29.True or false: to stop before a wall, use a sound sensor. (a) False (b) True
30. 30.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
31. 31.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
32. 32.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 65. What is under the sensor? (a) the white floor (b) the black line
33. 33.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) legs (c) wheels (d) tracks
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) the right sensor (d) both sensors
35. 35.🔍 Which sensor helps a robot hear a whistle? (a) a camera (b) a distance sensor (c) a light sensor (d) a sound sensor
36. 36.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driver gear (c) driven gear (d) idler gear
37. 37.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a light sensor (c) a camera (d) a temperature sensor
38. 38.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
39. 39.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
40. 40.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a white surface (d) a black surface

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