Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 888 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
2. 2.Which of these suits wheels? (a) a hospital corridor (b) deep mud (c) loose sand dunes (d) stepping over wide gaps
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
4. 4.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 7/22 (c) 22 (d) 2/7
5. 5.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
7. 7.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 3 cm (d) 340 cm
8. 8.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
9. 9.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
10. 10.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
11. 11.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
12. 12.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
13. 13.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 47. What is under the sensor? (a) the black line (b) the white floor
14. 14.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
15. 15.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.🧭 A robot should turn right 90°, but its gyro shows it turned 85°. How many degrees must it turn more to the right?
17. 17.True or false: to start on a hand clap, use a camera. (a) False (b) True
18. 18.True or false: “a smooth classroom floor” suits wheels. (a) False (b) True
19. 19.🧭 A robot should turn right 45°, but its gyro shows it turned 47°. How many degrees must it turn back to the left?
20. 20.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a metal door (c) a flat wall (d) a wooden box
21. 21.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
22. 22.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
23. 23.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a gyro sensor (c) a touch sensor (d) a sound sensor
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
25. 25.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
26. 26.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
27. 27.🧭 A robot should turn right 45°, but its gyro shows it turned 39°. How many degrees must it turn more to the right?
28. 28.🧭 A robot faces south. It does: turn left, turn around. Which way does it face now? (a) south (b) west (c) east (d) north
29. 29.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
31. 31.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle − 60
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) sound too high to hear (d) water drops
33. 33.🧭 A robot faces south. It does: turn left, turn left, turn right, turn left. Which way does it face now? (a) south (b) east (c) north (d) west
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 70. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
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 runs forward. What does the robot do? (a) goes straight back (b) goes straight forward (c) spins right on the spot (d) turns left
36. 36.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.Which job needs a distance sensor? (a) spot a red ball (b) feel a bump into a wall (c) stop before a wall (d) follow a black line
38. 38.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points up and left (c) points left (d) points right
39. 39.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) nowhere (c) slower (d) faster

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