Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 887 · 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 find the brightest spot, use a light sensor. (a) False (b) True
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points straight up (b) points left (c) points up and right (d) points right
3. 3.🧭 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 270°. It turns right 120°, then left 90°. What does the gyro read now (0° to 359°)?
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
5. 5.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) spins right on the spot (b) turns right (c) goes straight forward (d) stays still
6. 6.🛞 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) spins right on the spot (c) goes straight forward (d) turns left
7. 7.📡 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?
8. 8.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
9. 9.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
10. 10.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) driven gear (d) tyre
11. 11.True or false: to warn if motors get hot, use a gyro sensor. (a) False (b) True
12. 12.🧭 A robot faces east. It does: turn around, turn left, turn around, turn left. Which way does it face now? (a) north (b) west (c) south (d) east
13. 13.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 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
15. 15.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points right (c) points left (d) points straight up
16. 16.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
17. 17.⬛ 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) far behind it (d) between the two sensors
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
19. 19.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
21. 21.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
22. 22.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
23. 23.🧭 A robot should turn right 180°, but its gyro shows it turned 184°. How many degrees must it turn back to the left?
24. 24.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
25. 25.🧭 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 180°. It turns left 30°, then left 45°. What does the gyro read now (0° to 359°)?
26. 26.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
27. 27.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a white surface (d) a black line
28. 28.True or false: to measure how far a box is, use a touch sensor. (a) True (b) False
29. 29.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
30. 30.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.🛞 Why do most indoor robots use wheels? (a) they float (b) they look funny (c) they climb stairs (d) fast and easy on floors
33. 33.🧭 A robot faces south. It does: turn left, turn left, turn left, turn around. Which way does it face now? (a) south (b) north (c) west (d) east
34. 34.🧭 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 right 60°, then right 45°. What does the gyro read now (0° to 359°)?
35. 35.🛞 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) goes straight back (b) turns right (c) spins left on the spot (d) spins right on the spot
36. 36.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a cow (d) a bat
37. 37.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference
38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 34 cm (d) 340 cm
40. 40.🛞 Which way of moving suits this best: “hovering over a roof”? (a) legs (b) propellers (c) wheels (d) tracks

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