Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 386 · 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.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) wheels (c) tracks (d) propellers
2. 2.🧭 A robot faces east. It does: turn right, turn right, turn left, turn around. Which way does it face now? (a) south (b) east (c) west (d) north
3. 3.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
4. 4.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
5. 5.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 5 times. How many times did the driver turn?
6. 6.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
7. 7.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) motor volts (d) number of gears
8. 8.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
9. 9.True or false: “a muddy building site” suits wheels. (a) False (b) True
10. 10.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 57. What is under the sensor? (a) the black line (b) the white floor
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
14. 14.🔍 Which sensor helps a robot find the brightest spot? (a) a temperature sensor (b) a camera (c) a sound sensor (d) a light sensor
15. 15.🛞 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) goes straight back (b) spins right on the spot (c) stays still (d) turns right
16. 16.🔍 Which sensor helps a robot spot a red ball? (a) a sound sensor (b) a touch sensor (c) a light sensor (d) a camera
17. 17.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
18. 18.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a wooden box (c) a flat wall (d) a soft foam cushion
19. 19.🔍 Which sensor helps a robot stop before a wall? (a) a camera (b) a touch sensor (c) a light sensor (d) a distance sensor
20. 20.🧭 A robot faces east. It does: turn left, turn around, turn left, turn left. Which way does it face now? (a) north (b) east (c) west (d) south
21. 21.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
22. 22.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 220 cm?
23. 23.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) under the right sensor (c) between the two sensors (d) far behind it
25. 25.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) a gear (c) an input (d) an output
26. 26.🧭 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 60°, then left 120°, then right 60°. What does the gyro read now (0° to 359°)?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
28. 28.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🛞 Which way of moving suits this best: “flying over a field”? (a) propellers (b) tracks (c) legs (d) wheels
31. 31.⚙️ What are the bumps round the edge of a gear called? (a) pins (b) tyres (c) spokes (d) teeth
32. 32.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
33. 33.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
34. 34.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 198 cm?
35. 35.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
36. 36.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) spins right on the spot (b) turns right (c) goes straight forward (d) goes straight back
37. 37.📡 A robot is 270 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 6 seconds (in cm)?
38. 38.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
39. 39.⚙️ 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
40. 40.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small

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