Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 352 · 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 30 over black and 80 over white. A good threshold is halfway between them. What is it?
2. 2.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) sound is slow (c) it goes there and back (d) the sensor is half
4. 4.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black is loud (d) black soaks up light
5. 5.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
6. 6.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
7. 7.📡 A robot is 240 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 18 seconds (in cm)?
8. 8.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 30. What is under the sensor? (a) the black line (b) the white floor
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
10. 10.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 180° (d) 100°
11. 11.True or false: to stop before a wall, use a distance sensor. (a) False (b) True
12. 12.📡 A robot is 110 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
13. 13.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 39. What is under the sensor? (a) the black line (b) the white floor
14. 14.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) a wheel (c) an output (d) an input
15. 15.🛞 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 12 times. How far does the robot roll (in cm)?
16. 16.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 18. What is under the sensor? (a) the black line (b) the white floor
17. 17.Which job needs a sound sensor? (a) know a button is pressed (b) hear a whistle (c) measure a turn angle (d) read a QR code
18. 18.Which of these suits propellers? (a) flying over a field (b) a smooth classroom floor (c) loose sand dunes (d) crossing stepping-stones
19. 19.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
20. 20.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a gyro sensor (c) a temperature sensor (d) a light sensor
21. 21.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
22. 22.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) too fast on floors (d) harder to balance
23. 23.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
24. 24.True or false: “flying over a field” suits wheels. (a) False (b) True
25. 25.🔍 Which sensor helps a robot hear a whistle? (a) a gyro sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
26. 26.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
27. 27.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
28. 28.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
30. 30.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 54. What is under the sensor? (a) the black line (b) the white floor
31. 31.🛞 Circumference = π × … (a) diameter (b) radius only (c) speed (d) weight
32. 32.Which of these suits propellers? (a) moving under water (b) loose sand dunes (c) crossing stepping-stones (d) a field of tall boulders
33. 33.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
34. 34.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) wheels (c) propellers (d) tracks
36. 36.⚙️ 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
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) stays still (b) spins left on the spot (c) turns right (d) turns left
38. 38.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
39. 39.📡 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)?
40. 40.🧭 A robot faces east. It does: turn around, turn right. Which way does it face now? (a) west (b) east (c) north (d) south

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