Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 630 · 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 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
2. 2.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
3. 3.Which job needs a touch sensor? (a) hear a whistle (b) measure how far a box is (c) find the brightest spot (d) know a button is pressed
4. 4.⚙️ A 20-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times slower (c) 3 times bigger (d) 3 times louder
6. 6.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
7. 7.⚙️ A big gear drives a small gear. The small gear turns … (a) slower but stronger (b) at the same speed (c) faster but weaker (d) not at all
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
9. 9.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
10. 10.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
11. 11.🦾 A servo moves from 130° to 80°. How many degrees does it turn?
12. 12.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 59. What is under the sensor? (a) the black line (b) the white floor
13. 13.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 3 cm (d) 1 km
14. 14.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
15. 15.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) far behind it (c) under the left sensor (d) between the two sensors
16. 16.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) bright light (d) water drops
17. 17.True or false: to spot a red ball, use a temperature sensor. (a) True (b) False
18. 18.True or false: to measure a turn angle, use a distance sensor. (a) True (b) False
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
20. 20.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
21. 21.🛞 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) spins right on the spot (c) spins left on the spot (d) turns left
22. 22.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
23. 23.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
24. 24.⚙️ A 36-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
25. 25.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 792 cm?
26. 26.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
27. 27.🛞 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) spins left on the spot (b) turns right (c) turns left (d) goes straight forward
28. 28.🛞 Circumference = π × … (a) diameter (b) radius only (c) speed (d) weight
29. 29.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
31. 31.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
32. 32.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
33. 33.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) they float (d) fast and easy on floors
34. 34.Which job needs a gyro sensor? (a) find the brightest spot (b) hear a whistle (c) stay balanced upright (d) follow a black line
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 30. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
36. 36.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
38. 38.Which of these suits wheels? (a) a field of tall boulders (b) soft snow (c) a long factory floor (d) moving under water
39. 39.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
40. 40.🔍 Which sensor helps a robot feel a bump into a wall? (a) a gyro sensor (b) a sound sensor (c) a touch sensor (d) a camera

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