Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 718 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.🧭 How many degrees is a right-angle turn? (a) 90° (b) 45° (c) 360° (d) 180°
3. 3.🧭 A robot should turn right 180°, but its gyro shows it turned 193°. How many degrees must it turn back to the left?
4. 4.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
5. 5.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) big (slow and strong) (d) small (fast, weak)
6. 6.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 2 (c) 3 (d) 4
7. 7.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
8. 8.⚙️ A motor makes 160 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
11. 11.True or false: to feel a bump into a wall, use a light sensor. (a) False (b) True
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
13. 13.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) an input (d) a gear
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
16. 16.⚙️ 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
17. 17.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) hear claps (d) smell smoke
18. 18.⚙️ An 8-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
19. 19.🛞 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 right (b) turns left (c) goes straight forward (d) stays still
20. 20.🧭 A robot should turn right 90°, but its gyro shows it turned 103°. How many degrees must it turn back to the left?
21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
22. 22.🛞 Why do most indoor robots use wheels? (a) they look funny (b) fast and easy on floors (c) they float (d) they climb stairs
23. 23.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) harder to balance (d) they never tire
24. 24.⚙️ A 16-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
25. 25.Which job needs a distance sensor? (a) hear a whistle (b) stop before a wall (c) stay balanced upright (d) follow a black line
26. 26.📡 A robot is 150 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 19 seconds (in cm)?
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 big driver gear (b) a small driver gear
28. 28.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a bat (c) a goldfish (d) a cow
29. 29.Which of these suits propellers? (a) flying over a field (b) a long factory floor (c) a muddy building site (d) loose sand dunes
30. 30.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) propellers (c) legs (d) wheels
31. 31.📡 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)?
32. 32.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
33. 33.📡 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)?
34. 34.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
35. 35.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) between the two sensors (d) under the right sensor
37. 37.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
38. 38.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
39. 39.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
40. 40.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?

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