Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 273 · 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 stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points straight up (c) points up and right (d) points right
3. 3.True or false: “crossing stepping-stones” suits propellers. (a) False (b) True
4. 4.🦾 A servo program runs:
   angle = 50
   angle = angle + 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its diameter (d) its circumference
6. 6.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
7. 7.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
8. 8.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
9. 9.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
10. 10.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a black line (d) a white surface
11. 11.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
12. 12.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.True or false: to find the brightest spot, use a temperature sensor. (a) True (b) False
14. 14.🧭 A robot should turn right 45°, but its gyro shows it turned 37°. How many degrees must it turn more to the right?
15. 15.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) driver teeth (d) wheel size
16. 16.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
17. 17.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
19. 19.🛞 Which way of moving suits this best: “flying over a field”? (a) wheels (b) legs (c) tracks (d) propellers
20. 20.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a soft foam cushion (d) a metal door
22. 22.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driven gear (c) idler gear (d) driver gear
23. 23.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
24. 24.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) legs (c) wheels (d) propellers
25. 25.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
26. 26.🔍 Which sensor helps a robot start on a hand clap? (a) a camera (b) a touch sensor (c) a gyro sensor (d) a sound sensor
27. 27.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
30. 30.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
31. 31.Which of these suits propellers? (a) hovering over a roof (b) a hospital corridor (c) loose sand dunes (d) a smooth classroom floor
32. 32.🧭 A robot faces east. It does: turn left, turn left, turn right, turn around. Which way does it face now? (a) west (b) south (c) north (d) east
33. 33.True or false: “deep mud” suits tracks. (a) False (b) True
34. 34.Which of these suits tracks? (a) a smooth classroom floor (b) a flat road (c) deep mud (d) a hospital corridor
35. 35.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) zero (d) small (fast, weak)
36. 36.🛞 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) turns right (b) spins left on the spot (c) goes straight back (d) stays still
37. 37.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
38. 38.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
39. 39.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) a gear (c) an output (d) an input
40. 40.🔍 Which sensor helps a robot stop before a wall? (a) a camera (b) a distance sensor (c) a sound sensor (d) a temperature sensor

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