Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 112 · 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 motor makes 250 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
2. 2.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a gyro sensor (c) a light sensor (d) a sound sensor
3. 3.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
5. 5.🛞 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)? =
6. 6.True or false: to find the brightest spot, use a camera. (a) True (b) False
7. 7.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
8. 8.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
9. 9.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
10. 10.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
12. 12.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 90° (d) 360°
13. 13.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 44. What is under the sensor? (a) the white floor (b) the black line
14. 14.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its weight (c) its circumference (d) its radius
15. 15.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a touch sensor
16. 16.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
17. 17.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
18. 18.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 100° (d) 360°
19. 19.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise
20. 20.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a goldfish (d) a bat
21. 21.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a touch sensor (d) a gyro sensor
22. 22.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 74. What is under the sensor? (a) the black line (b) the white floor
23. 23.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
24. 24.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
25. 25.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
26. 26.⚙️ A motor makes 300 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
27. 27.⬛ A reading below the threshold means the sensor is over … (a) water (b) white (c) black (d) the sky
28. 28.Which of these suits wheels? (a) stepping over wide gaps (b) soft snow (c) a hospital corridor (d) crossing stepping-stones
29. 29.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
30. 30.⚙️ A motor makes 160 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
32. 32.True or false: “crossing stepping-stones” suits legs. (a) True (b) False
33. 33.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) zero (d) big (slow and strong)
34. 34.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) turns left (b) stays still (c) spins left on the spot (d) goes straight back
35. 35.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) wheels (b) legs (c) propellers (d) tracks
36. 36.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) a gear (d) an input
37. 37.⚙️ A 12-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
38. 38.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 1 km (d) 3 cm
40. 40.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?

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