Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 756 · 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 robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.🧭 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 right 135°, then right 60°. What does the gyro read now (0° to 359°)?
3. 3.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
4. 4.🛞 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 left on the spot (b) goes straight back (c) turns left (d) stays still
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
6. 6.🧭 A robot should turn right 180°, but its gyro shows it turned 184°. How many degrees must it turn back to the left?
7. 7.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 56. What is under the sensor? (a) the white floor (b) the black line
8. 8.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 85. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
9. 9.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is hot (c) black is wet (d) black is loud
10. 10.True or false: “a long factory floor” suits wheels. (a) False (b) True
11. 11.⚙️ A 15-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
12. 12.⬛ A reading below the threshold means the sensor is over … (a) black (b) water (c) the sky (d) white
13. 13.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a snail (d) a bat
14. 14.🛞 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 9 times. How far does the robot roll (in cm)?
15. 15.Which job needs a sound sensor? (a) hear a whistle (b) measure how far a box is (c) know a button is pressed (d) feel a bump into a wall
16. 16.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 2/7 (c) 22 (d) 7/22
17. 17.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) radio music (d) bright light
18. 18.Which job needs a camera? (a) hear a whistle (b) find the brightest spot (c) stay balanced upright (d) read a QR code
19. 19.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
20. 20.True or false: to measure a turn angle, use a gyro sensor. (a) False (b) True
21. 21.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
22. 22.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) one up, one down (c) they do not turn (d) in opposite directions
23. 23.🧭 A robot spins 60° every second. How many seconds does it take to turn 120°?
24. 24.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a light sensor (c) a camera (d) a gyro sensor
25. 25.📡 A robot is 280 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 13 seconds (in cm)?
26. 26.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
27. 27.⚙️ 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 small driver gear (b) a big driver gear
28. 28.🛞 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) turns left (b) turns right (c) spins left on the spot (d) goes straight forward
29. 29.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
30. 30.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
31. 31.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
32. 32.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
33. 33.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) under the left sensor (c) far behind it (d) between the two sensors
34. 34.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
35. 35.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
36. 36.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 1 km (d) 34 cm
37. 37.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
39. 39.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
40. 40.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 45° (d) 90°

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