Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 868 · 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.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 360° (d) 90°
2. 2.⚙️ A 15-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
3. 3.🦾 A servo program runs:
   angle = 110
   angle = angle − 40
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
4. 4.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) one wheel runs faster (c) it stops for ever (d) it uses a sail
5. 5.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
6. 6.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
7. 7.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.True or false: to stay balanced upright, use a temperature sensor. (a) False (b) True
10. 10.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
11. 11.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
12. 12.Which of these suits wheels? (a) a field of tall boulders (b) a long factory floor (c) crossing stepping-stones (d) moving under water
13. 13.Which job needs a light sensor? (a) find the brightest spot (b) feel a bump into a wall (c) read a QR code (d) stay balanced upright
14. 14.🔍 Which sensor helps a robot stay balanced upright? (a) a camera (b) a light sensor (c) a touch sensor (d) a gyro sensor
15. 15.Which of these suits legs? (a) hovering over a roof (b) flying over a field (c) a flat road (d) a field of tall boulders
16. 16.⚙️ 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
17. 17.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
18. 18.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
19. 19.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.⚙️ An 8-tooth gear drives a 16-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
22. 22.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
23. 23.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
24. 24.Which job needs a gyro sensor? (a) read a QR code (b) measure how far a box is (c) measure a turn angle (d) warn if motors get hot
25. 25.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) too fast on floors (c) they never tire (d) they are too cheap
26. 26.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its weight (c) its radius (d) its diameter
28. 28.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 34. What is under the sensor? (a) the white floor (b) the black line
29. 29.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size
30. 30.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
31. 31.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.⚙️ A 10-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
33. 33.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) faster (c) backwards (d) nowhere
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
35. 35.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) propellers (c) wheels (d) legs
36. 36.🧭 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 right 45°, then right 60°. What does the gyro read now (0° to 359°)?
37. 37.🧭 A robot should turn right 45°, but its gyro shows it turned 60°. How many degrees must it turn back to the left?
38. 38.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
39. 39.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
40. 40.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor

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