Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 329 · 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.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 45° (d) 90°
2. 2.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) water (d) the sky
3. 3.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 2/7 (c) 22 (d) 7/22
4. 4.🛞 Which way of moving suits this best: “loose sand dunes”? (a) tracks (b) legs (c) propellers (d) wheels
5. 5.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) the same direction (c) in opposite directions (d) they do not turn
6. 6.🧭 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 0°. It turns left 45°, then right 135°, then right 30°. What does the gyro read now (0° to 359°)?
7. 7.🦾 A servo moves from 80° to 100°. How many degrees does it turn?
8. 8.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a touch sensor (d) a gyro sensor
9. 9.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) fast and easy on floors (d) they climb stairs
10. 10.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
11. 11.📡 A robot is 250 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 2 seconds (in cm)?
12. 12.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a bat (c) a snail (d) a goldfish
13. 13.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black soaks up light (d) black is hot
14. 14.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 70. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
15. 15.True or false: “a hospital corridor” suits wheels. (a) True (b) False
16. 16.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
17. 17.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
18. 18.Which job needs a temperature sensor? (a) know a button is pressed (b) find the brightest spot (c) warn if motors get hot (d) stay balanced upright
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
20. 20.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
21. 21.⚙️ 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 big driver gear (b) a small driver gear
22. 22.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
23. 23.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 3 (d) 1
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.Which of these suits tracks? (a) soft snow (b) crossing stepping-stones (c) a hospital corridor (d) stepping over wide gaps
26. 26.📡 A robot is 170 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 6 seconds (in cm)?
27. 27.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its radius (c) its diameter (d) its weight
28. 28.True or false: to measure how far a box is, use a light sensor. (a) False (b) True
29. 29.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) harder to balance (c) too fast on floors (d) they never tire
30. 30.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
32. 32.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
33. 33.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
34. 34.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
35. 35.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 81. What is under the sensor? (a) the black line (b) the white floor
36. 36.📡 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?
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
38. 38.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
39. 39.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 39. What is under the sensor? (a) the white floor (b) the black line
40. 40.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?

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