Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 46 · 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.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
2. 2.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
3. 3.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they are shiny (c) they spin in the air (d) they spread the weight
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
5. 5.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its radius (d) its circumference
6. 6.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 58. What is under the sensor? (a) the white floor (b) the black line
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
8. 8.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
9. 9.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) at the same speed (c) not at all (d) slower but stronger
10. 10.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
11. 11.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
13. 13.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
14. 14.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 95. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
16. 16.Which of these suits propellers? (a) crossing stepping-stones (b) a flat road (c) moving under water (d) a long factory floor
17. 17.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
18. 18.⬛ The threshold of a light sensor is … (a) the top speed (b) the battery size (c) the black/white cut-off (d) the wheel size
19. 19.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
20. 20.⚙️ A motor makes 100 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
21. 21.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
22. 22.📡 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)?
23. 23.⚙️ A 20-tooth driver gear turns a 12-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
24. 24.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
25. 25.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
26. 26.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
28. 28.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
30. 30.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
31. 31.🛞 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) goes straight back (b) goes straight forward (c) stays still (d) spins left on the spot
32. 32.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
34. 34.🧭 A robot faces north. It does: turn right, turn left, turn around, turn left. Which way does it face now? (a) north (b) south (c) east (d) west
35. 35.Which of these suits propellers? (a) a muddy building site (b) a smooth classroom floor (c) hovering over a roof (d) a field of tall boulders
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.True or false: to read a QR code, use a light sensor. (a) False (b) True
38. 38.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 41. What is under the sensor? (a) the white floor (b) the black line
39. 39.Which job needs a temperature sensor? (a) read a QR code (b) stop before a wall (c) start on a hand clap (d) warn if motors get hot
40. 40.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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