Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 11 · 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.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) driven gear (c) tyre (d) idler gear
2. 2.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 594 cm?
3. 3.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
4. 4.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) propellers (c) tracks (d) wheels
6. 6.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
7. 7.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 90° (d) 45°
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
10. 10.🧭 A robot should turn right 90°, but its gyro shows it turned 75°. How many degrees must it turn more to the right?
11. 11.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they spin in the air (d) they are round
12. 12.📡 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?
13. 13.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a black line (c) a white surface (d) a dark tunnel
14. 14.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a metal door (d) a wooden box
15. 15.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
16. 16.🛞 Which way of moving suits this best: “deep mud”? (a) tracks (b) propellers (c) wheels (d) legs
17. 17.🛞 Which way of moving suits this best: “moving under water”? (a) propellers (b) wheels (c) tracks (d) legs
18. 18.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
19. 19.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) they do not turn (d) one up, one down
21. 21.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
22. 22.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
23. 23.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
24. 24.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 180° (d) 90°
25. 25.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
29. 29.⚙️ 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
30. 30.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
31. 31.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) tracks (c) propellers (d) legs
32. 32.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
33. 33.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
34. 34.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its weight (c) its radius (d) its diameter
36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
37. 37.📡 A robot is 220 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 9 seconds (in cm)?
38. 38.📡 A robot is 140 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
39. 39.True or false: to follow a black line, use a light sensor. (a) False (b) True
40. 40.Which of these suits tracks? (a) crossing stepping-stones (b) a long factory floor (c) soft snow (d) a flat road

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