Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 187 · 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 below 30 over a black line and above 30 over the white floor. It reads 54. What is under the sensor? (a) the black line (b) the white floor
2. 2.🧭 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 left 90°, then right 45°, then left 135°. What does the gyro read now (0° to 359°)?
3. 3.True or false: “stepping over wide gaps” suits legs. (a) False (b) True
4. 4.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its radius (d) its circumference
5. 5.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
7. 7.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it uses a sail (c) it stops for ever (d) one wheel runs faster
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
10. 10.⚙️ A motor makes 120 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?
11. 11.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) spins right on the spot (b) goes straight forward (c) stays still (d) goes straight back
12. 12.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
13. 13.⚙️ 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
14. 14.🧭 A robot spins 30° every second. How many seconds does it take to turn 210°?
15. 15.True or false: to stop before a wall, use a distance sensor. (a) False (b) True
16. 16.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 880 cm?
18. 18.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
20. 20.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 23. What is under the sensor? (a) the white floor (b) the black line
21. 21.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 90° (d) 180°
22. 22.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a gyro sensor (c) a sound sensor (d) a touch sensor
23. 23.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 59. What is under the sensor? (a) the black line (b) the white floor
24. 24.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
25. 25.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 73. What is under the sensor? (a) the black line (b) the white floor
26. 26.🛞 Circumference = π × … (a) radius only (b) weight (c) diameter (d) speed
27. 27.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
29. 29.True or false: “deep mud” suits legs. (a) False (b) True
30. 30.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
31. 31.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
32. 32.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a caster wheel (c) a gear (d) a track
33. 33.Which of these suits wheels? (a) hovering over a roof (b) a muddy building site (c) a smooth classroom floor (d) moving under water
34. 34.Which job needs a touch sensor? (a) start on a hand clap (b) follow a black line (c) feel a bump into a wall (d) find the brightest spot
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 40. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
36. 36.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
37. 37.🦾 A servo moves from 90° to 160°. How many degrees does it turn?
38. 38.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are shiny (c) they spread the weight (d) they are round
39. 39.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a temperature sensor (c) a gyro sensor (d) a light sensor
40. 40.🧭 A robot faces west. It does: turn left, turn around. Which way does it face now? (a) east (b) south (c) north (d) west

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