Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 713 · 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 26. What is under the sensor? (a) the white floor (b) the black line
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points up and right (c) points straight up (d) points right
3. 3.🦾 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 up and right (b) points left (c) points up and left (d) points straight up
4. 4.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
5. 5.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a white surface (c) a black line (d) a dark tunnel
6. 6.Which of these suits tracks? (a) deep mud (b) a smooth classroom floor (c) a long factory floor (d) hovering over a roof
7. 7.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an input (c) an output (d) a wheel
8. 8.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) driver teeth (d) number of gears
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
12. 12.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 22 seconds (in cm)?
13. 13.⚙️ A motor makes 330 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
14. 14.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
15. 15.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) faster but weaker (c) slower but stronger (d) not at all
17. 17.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) turning (rotation) (d) sound
18. 18.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a touch sensor (c) a sound sensor (d) a temperature sensor
19. 19.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
20. 20.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
21. 21.⚙️ A motor makes 180 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
22. 22.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🦾 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 up and right (b) points straight up (c) points right (d) points up and left
25. 25.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a bat (c) a cow (d) a goldfish
26. 26.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22/7 (c) 22 (d) 2/7
27. 27.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
28. 28.🛞 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)? =
29. 29.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 90° (d) 180°
30. 30.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
31. 31.🛞 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 forward. What does the robot do? (a) spins left on the spot (b) spins right on the spot (c) stays still (d) goes straight forward
32. 32.Which of these suits legs? (a) hovering over a roof (b) flying over a field (c) stepping over wide gaps (d) loose sand dunes
33. 33.⚙️ A motor makes 120 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
34. 34.True or false: to spot a red ball, use a camera. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 40
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
37. 37.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
38. 38.🛞 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) turns left (d) goes straight forward
39. 39.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor

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