Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 877 · 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: “holds a set angle” is true of a servo motor. (a) False (b) True
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
3. 3.🔍 Which sensor helps a robot feel a bump into a wall? (a) a temperature sensor (b) a distance sensor (c) a gyro sensor (d) a touch sensor
4. 4.📡 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?
5. 5.🧭 A robot spins 15° every second. How many seconds does it take to turn 225°?
6. 6.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) stays still (b) goes straight forward (c) spins right on the spot (d) spins left on the spot
7. 7.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a track (c) a servo (d) a gear
8. 8.🛞 Which way of moving suits this best: “a flat road”? (a) tracks (b) wheels (c) propellers (d) legs
9. 9.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
10. 10.🧭 How many degrees is a full turn? (a) 360° (b) 180° (c) 90° (d) 100°
11. 11.True or false: “a flat road” suits wheels. (a) False (b) True
12. 12.🔍 Which sensor helps a robot read a QR code? (a) a touch sensor (b) a temperature sensor (c) a camera (d) a light sensor
13. 13.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) sound too high to hear (d) radio music
14. 14.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 180° (d) 45°
15. 15.📡 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) Yes (b) No
16. 16.📡 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)?
17. 17.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
19. 19.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times bigger (d) 3 times slower
20. 20.🛞 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 right on the spot (b) turns left (c) spins left on the spot (d) goes straight back
21. 21.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the right sensor (c) under the left sensor (d) between the two sensors
22. 22.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 35. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
24. 24.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) turning (rotation) (d) temperature
25. 25.🛞 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 4 times. How far does the robot roll (in cm)?
26. 26.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 4 (c) 1 (d) 3
27. 27.🦾 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 left (b) points straight up (c) points right (d) points up and right
28. 28.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are shiny (c) they spin in the air (d) they are round
29. 29.🧭 A robot should turn right 90°, but its gyro shows it turned 92°. How many degrees must it turn back to the left?
30. 30.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
31. 31.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) propellers (c) legs (d) tracks
32. 32.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a gyro sensor (c) a temperature sensor (d) a sound sensor
33. 33.🧭 A robot spins 60° every second. How many seconds does it take to turn 300°?
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
35. 35.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 58. What is under the sensor? (a) the white floor (b) the black line
36. 36.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
37. 37.🦾 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 right (b) points up and left (c) points up and right (d) points left
38. 38.True or false: “flying over a field” suits wheels. (a) True (b) False
39. 39.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
40. 40.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 2/7 (d) 22/7

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