Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 565 · 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: “drives the wheels” is true of a servo motor. (a) False (b) True
2. 2.⚙️ A motor makes 300 turns a minute with a 15-tooth gear on it. That gear drives a 45-tooth gear. How many turns a minute does the 45-tooth gear make?
3. 3.🔍 Why do robots need sensors? (a) to know their world (b) to use more power (c) to be heavier (d) to look colourful
4. 4.Which job needs a touch sensor? (a) measure a turn angle (b) find the brightest spot (c) feel a bump into a wall (d) spot a red ball
5. 5.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
6. 6.📡 A robot is 290 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 16 seconds (in cm)?
7. 7.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) smell smoke (d) hear claps
8. 8.🦾 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 straight up (b) points up and right (c) points left (d) points right
9. 9.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
11. 11.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
15. 15.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
16. 16.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
17. 17.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
18. 18.Which job needs a sound sensor? (a) follow a black line (b) start on a hand clap (c) feel a bump into a wall (d) measure a turn angle
19. 19.📡 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?
20. 20.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) legs (c) tracks (d) propellers
21. 21.Which of these suits tracks? (a) deep mud (b) a field of tall boulders (c) a hospital corridor (d) a long factory floor
22. 22.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) legs (c) propellers (d) wheels
23. 23.🛞 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) spins left on the spot (b) turns right (c) turns left (d) goes straight forward
24. 24.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) propellers (c) wheels (d) tracks
25. 25.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
26. 26.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a camera (c) a temperature sensor (d) a light sensor
27. 27.🛞 Which way of moving suits this best: “hovering over a roof”? (a) wheels (b) tracks (c) propellers (d) legs
28. 28.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
29. 29.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
30. 30.⚙️ 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
31. 31.True or false: “deep mud” suits tracks. (a) False (b) True
32. 32.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
33. 33.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.Which job needs a light sensor? (a) find the brightest spot (b) read a QR code (c) start on a hand clap (d) measure a turn angle
35. 35.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a bat (d) a goldfish
36. 36.🦾 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 right (b) points left (c) points straight up (d) points up and right
37. 37.Which job needs a temperature sensor? (a) measure how far a box is (b) warn if motors get hot (c) follow a black line (d) feel a bump into a wall
38. 38.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
39. 39.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes

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