Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 354 · 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.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) big (slow and strong) (d) never important
2. 2.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its diameter (c) its weight (d) its radius
3. 3.🔍 Which sensor helps a robot measure a turn angle? (a) a touch sensor (b) a distance sensor (c) a gyro sensor (d) a light sensor
4. 4.True or false: to stay balanced upright, use a touch sensor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.🧭 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 left 135°, then left 120°, then right 45°. What does the gyro read now (0° to 359°)?
7. 7.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
8. 8.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 57. What is under the sensor? (a) the white floor (b) the black line
9. 9.🔍 Which sensor helps a robot start on a hand clap? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a touch sensor
10. 10.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor
11. 11.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the wheel size (d) the top speed
12. 12.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 90° (d) 180°
13. 13.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
14. 14.Which job needs a touch sensor? (a) start on a hand clap (b) know a button is pressed (c) measure a turn angle (d) find the brightest spot
15. 15.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) at the same speed (c) faster and weaker (d) slower but stronger
16. 16.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 33 seconds (in cm)?
17. 17.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
18. 18.⬛ 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 loud (d) black is wet
19. 19.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 180° (c) 90° (d) 45°
20. 20.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 53. What is under the sensor? (a) the black line (b) the white floor
21. 21.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
22. 22.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
23. 23.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 2 (d) 3
24. 24.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
25. 25.⚙️ A 12-tooth gear drives a 60-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
26. 26.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.📡 A robot is 200 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
29. 29.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
30. 30.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are round (c) they are shiny (d) they spread the weight
31. 31.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 58. What is under the sensor? (a) the black line (b) the white floor
32. 32.🦾 A servo moves from 150° to 60°. How many degrees does it turn?
33. 33.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) a gear (d) an input
34. 34.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
36. 36.Which job needs a gyro sensor? (a) measure a turn angle (b) find the brightest spot (c) start on a hand clap (d) feel a bump into a wall
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns right (b) spins right on the spot (c) goes straight back (d) spins left on the spot
38. 38.True or false: to find the brightest spot, use a light sensor. (a) True (b) False
39. 39.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times bigger (d) 3 times slower
40. 40.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big

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