Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 944 · 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 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 27 times. How many times does the driven gear turn?
2. 2.🧭 A robot spins 30° every second. How many seconds does it take to turn 330°?
3. 3.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
4. 4.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
5. 5.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) wheels (c) legs (d) propellers
6. 6.⚙️ A motor makes 320 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
7. 7.Which of these suits wheels? (a) soft snow (b) a flat road (c) stepping over wide gaps (d) moving under water
8. 8.⚙️ A motor makes 250 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
9. 9.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) the sensor is half (d) sound is slow
11. 11.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they look funny (c) they float (d) they climb stairs
12. 12.🧭 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 0°. It turns left 135°, then left 180°, then right 60°. What does the gyro read now (0° to 359°)?
13. 13.🛞 Circumference = π × … (a) diameter (b) radius only (c) speed (d) weight
14. 14.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
15. 15.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) wheels (c) legs (d) propellers
16. 16.🧭 A robot faces west. It does: turn around, turn right. Which way does it face now? (a) south (b) north (c) west (d) east
17. 17.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 3 cm (d) 1 km
18. 18.⚙️ A 36-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
19. 19.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
20. 20.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
21. 21.⚙️ 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
22. 22.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 80. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
23. 23.🧭 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 90°. It turns left 120°, then right 135°. What does the gyro read now (0° to 359°)?
24. 24.🧭 A robot keeps turning right by 120° at a time. How many turns make one full circle?
25. 25.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.🧭 A robot should turn right 45°, but its gyro shows it turned 48°. How many degrees must it turn back to the left?
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
29. 29.Which of these suits tracks? (a) flying over a field (b) a flat road (c) a muddy building site (d) hovering over a roof
30. 30.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
31. 31.Which of these suits wheels? (a) moving under water (b) crossing stepping-stones (c) a smooth classroom floor (d) loose sand dunes
32. 32.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
33. 33.Which job needs a gyro sensor? (a) know a button is pressed (b) find the brightest spot (c) measure a turn angle (d) feel a bump into a wall
34. 34.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) temperature (d) turning (rotation)
35. 35.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a touch sensor (c) a light sensor (d) a gyro sensor
36. 36.Which job needs a distance sensor? (a) stay balanced upright (b) warn if motors get hot (c) measure how far a box is (d) start on a hand clap
37. 37.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
38. 38.🧭 A robot faces north. It does: turn left, turn right, turn left, turn around. Which way does it face now? (a) north (b) west (c) east (d) south
39. 39.📡 A robot is 220 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
40. 40.🔍 Why do robots need sensors? (a) to know their world (b) to be heavier (c) to use more power (d) to look colourful

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