Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 572 · 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 robot is 280 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 21 seconds (in cm)?
2. 2.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
3. 3.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black line (c) a white surface (d) a black surface
4. 4.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) tyre (d) driven gear
5. 5.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
6. 6.⚙️ 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
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
8. 8.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
9. 9.🦾 A servo program runs:
   angle = 0
   angle = angle + 40
   angle = angle − 30
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
10. 10.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
11. 11.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
12. 12.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight forward (b) turns right (c) turns left (d) stays still
13. 13.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
14. 14.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
15. 15.🧭 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 180°. It turns left 135°, then right 30°, then left 120°. What does the gyro read now (0° to 359°)?
16. 16.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
19. 19.True or false: “moving under water” suits propellers. (a) True (b) False
20. 20.Which of these suits wheels? (a) crossing stepping-stones (b) a flat road (c) soft snow (d) deep mud
21. 21.📡 A robot is 150 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 6 seconds (in cm)?
22. 22.Which of these suits legs? (a) soft snow (b) a smooth classroom floor (c) a long factory floor (d) crossing stepping-stones
23. 23.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
24. 24.Which job needs a temperature sensor? (a) find the brightest spot (b) warn if motors get hot (c) stop before a wall (d) read a QR code
25. 25.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
26. 26.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
27. 27.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
29. 29.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) at the same speed (c) faster and weaker (d) not at all
30. 30.Which of these suits legs? (a) a long factory floor (b) a muddy building site (c) a smooth classroom floor (d) a field of tall boulders
31. 31.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
32. 32.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
33. 33.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) it jumps (d) one wheel runs faster
34. 34.🧭 A robot spins 45° every second. How many seconds does it take to turn 270°?
35. 35.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
36. 36.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
37. 37.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) sound too high to hear (d) water drops
40. 40.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan

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