Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 864 · 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 robot spins 60° every second. How many seconds does it take to turn 360°?
2. 2.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
3. 3.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
4. 4.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) in opposite directions (d) the same direction
6. 6.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
7. 7.⚙️ A motor makes 280 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
8. 8.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
9. 9.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
10. 10.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 180° (d) 360°
11. 11.🧭 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 right 60°, then left 135°, then right 45°. What does the gyro read now (0° to 359°)?
12. 12.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times bigger (d) 3 times slower
14. 14.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
15. 15.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
17. 17.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
18. 18.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
19. 19.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
20. 20.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
21. 21.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 10
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
23. 23.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 47. What is under the sensor? (a) the black line (b) the white floor
24. 24.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
25. 25.Which job needs a sound sensor? (a) stop before a wall (b) hear a whistle (c) find the brightest spot (d) follow a black line
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
27. 27.📡 A robot is 280 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 15 seconds (in cm)?
28. 28.True or false: to feel a bump into a wall, use a distance sensor. (a) False (b) True
29. 29.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a metal door (d) a soft foam cushion
30. 30.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
31. 31.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its diameter (c) its circumference (d) its weight
32. 32.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
33. 33.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
34. 34.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 71. What is under the sensor? (a) the white floor (b) the black line
35. 35.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they are shiny (d) they spread the weight
36. 36.⚙️ A 15-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
37. 37.🔍 Which sensor helps a robot start on a hand clap? (a) a gyro sensor (b) a touch sensor (c) a temperature sensor (d) a sound sensor
38. 38.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 35. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
40. 40.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a cow (c) a snail (d) a bat

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