Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 373 · 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.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
2. 2.True or false: to start on a hand clap, use a sound sensor. (a) False (b) True
3. 3.🧭 A robot should turn right 90°, but its gyro shows it turned 79°. How many degrees must it turn more to the right?
4. 4.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
5. 5.Which of these suits wheels? (a) a muddy building site (b) a smooth classroom floor (c) crossing stepping-stones (d) loose sand dunes
6. 6.📡 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)?
7. 7.🛞 Why do most indoor robots use wheels? (a) they float (b) they climb stairs (c) fast and easy on floors (d) they look funny
8. 8.True or false: to hear a whistle, use a touch sensor. (a) False (b) True
9. 9.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
10. 10.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🧭 A robot should turn right 90°, but its gyro shows it turned 103°. How many degrees must it turn back to the left?
12. 12.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
14. 14.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 180° (d) 360°
15. 15.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a camera (c) a temperature sensor (d) a distance sensor
16. 16.🦾 A servo moves from 110° to 90°. How many degrees does it turn?
17. 17.🔦 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
18. 18.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
20. 20.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.🧭 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 0°. It turns left 135°, then left 120°. What does the gyro read now (0° to 359°)?
23. 23.🔍 Which sensor helps a robot find the brightest spot? (a) a temperature sensor (b) a gyro sensor (c) a light sensor (d) a sound sensor
24. 24.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the black/white cut-off (d) the wheel size
25. 25.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) it goes there and back (d) the sensor is half
26. 26.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) tracks (c) legs (d) propellers
27. 27.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) sound too high to hear (d) bright light
29. 29.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius
30. 30.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they spin in the air (c) they are shiny (d) they are round
31. 31.⚙️ A motor makes 200 turns a minute with a 12-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
32. 32.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
33. 33.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
34. 34.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
35. 35.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
36. 36.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 770 cm?
37. 37.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 4 (c) 1 (d) 2
38. 38.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
40. 40.🧭 A robot should turn right 180°, but its gyro shows it turned 177°. How many degrees must it turn more to the right?

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids