Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 982 · 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.True or false: to warn if motors get hot, use a sound sensor. (a) True (b) False
2. 2.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
3. 3.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
4. 4.📡 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
7. 7.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
8. 8.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a sound sensor (d) a touch sensor
9. 9.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
10. 10.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
11. 11.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are round (c) they spread the weight (d) they are shiny
12. 12.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) backwards (c) faster (d) nowhere
13. 13.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 27. What is under the sensor? (a) the black line (b) the white floor
14. 14.True or false: “crossing stepping-stones” suits tracks. (a) False (b) True
15. 15.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
16. 16.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
17. 17.⚙️ A 24-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
18. 18.True or false: to spot a red ball, use a sound sensor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
20. 20.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
21. 21.🛞 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) stays still (b) turns right (c) turns left (d) spins right on the spot
22. 22.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
23. 23.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
24. 24.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
27. 27.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
28. 28.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
29. 29.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
30. 30.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
31. 31.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
32. 32.⚙️ 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
33. 33.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) a gear (c) an output (d) an input
34. 34.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
35. 35.🧭 A robot should turn right 45°, but its gyro shows it turned 39°. How many degrees must it turn more to the right?
36. 36.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
37. 37.True or false: to hear a whistle, use a sound sensor. (a) False (b) True
38. 38.🧭 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 270°. It turns left 135°, then left 90°, then left 45°. What does the gyro read now (0° to 359°)?
39. 39.True or false: to hear a whistle, use a distance sensor. (a) True (b) False
40. 40.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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