Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 550 · 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 120°?
2. 2.🔍 Which sensor helps a robot hear a whistle? (a) a sound sensor (b) a light sensor (c) a touch sensor (d) a gyro sensor
3. 3.Which of these suits propellers? (a) moving under water (b) a muddy building site (c) a hospital corridor (d) soft snow
4. 4.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
5. 5.⬛ A reading below the threshold means the sensor is over … (a) black (b) water (c) the sky (d) white
6. 6.🛞 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 backward. What does the robot do? (a) turns left (b) spins right on the spot (c) goes straight forward (d) goes straight back
7. 7.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
8. 8.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
10. 10.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) faster (c) slower (d) backwards
11. 11.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 340 cm (d) 3 cm
12. 12.🔍 What does a gyro sensor measure? (a) colour (b) temperature (c) sound (d) turning (rotation)
13. 13.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) hear claps (d) turn by exact angles
14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points up and right (c) points up and left (d) points right
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
17. 17.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a cow (c) a snail (d) a bat
18. 18.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
19. 19.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
20. 20.📡 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)?
21. 21.Which of these suits tracks? (a) a long factory floor (b) a smooth classroom floor (c) a muddy building site (d) flying over a field
22. 22.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
23. 23.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 13. What is under the sensor? (a) the white floor (b) the black line
24. 24.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) far behind it (d) under the right sensor
25. 25.Which job needs a gyro sensor? (a) read a QR code (b) know a button is pressed (c) measure a turn angle (d) stop before a wall
26. 26.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a gear (c) a caster wheel (d) a track
27. 27.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 84. What is under the sensor? (a) the black line (b) the white floor
29. 29.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
30. 30.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
32. 32.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) one up, one down (d) the same direction
33. 33.Which job needs a sound sensor? (a) stop before a wall (b) find the brightest spot (c) hear a whistle (d) stay balanced upright
34. 34.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
35. 35.📡 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?
36. 36.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
37. 37.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 90° (c) 180° (d) 45°
38. 38.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
39. 39.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 44. What is under the sensor? (a) the white floor (b) the black line
40. 40.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its weight (d) its circumference

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