Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 323 · 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.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) wheels (c) legs (d) propellers
2. 2.⚙️ A 24-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
3. 3.Which job needs a camera? (a) read a QR code (b) stop before a wall (c) hear a whistle (d) start on a hand clap
4. 4.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
5. 5.Which job needs a sound sensor? (a) hear a whistle (b) read a QR code (c) know a button is pressed (d) follow a black line
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
7. 7.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
8. 8.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
9. 9.🛞 Which way of moving suits this best: “soft snow”? (a) propellers (b) legs (c) wheels (d) tracks
10. 10.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
12. 12.🦾 A servo moves from 90° to 40°. How many degrees does it turn?
13. 13.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight forward (b) stays still (c) spins left on the spot (d) turns left
14. 14.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
15. 15.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) backwards (c) nowhere (d) slower
16. 16.🔍 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
17. 17.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
18. 18.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
19. 19.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) colour (d) temperature
20. 20.True or false: to stay balanced upright, use a touch sensor. (a) False (b) True
21. 21.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
22. 22.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
23. 23.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
25. 25.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
26. 26.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
27. 27.True or false: “crossing stepping-stones” suits legs. (a) False (b) True
28. 28.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
29. 29.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
32. 32.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 34. What is under the sensor? (a) the white floor (b) the black line
33. 33.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
34. 34.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
35. 35.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
36. 36.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) it goes there and back (c) to make it smaller (d) sound is slow
37. 37.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
38. 38.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
39. 39.True or false: “a long factory floor” suits wheels. (a) False (b) True
40. 40.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius

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