Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 169 · 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 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)?
2. 2.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 22 (c) 2/7 (d) 7/22
3. 3.📡 A robot is 160 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 10 seconds (in cm)?
4. 4.🔍 Which sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a camera (c) a touch sensor (d) a distance sensor
5. 5.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.⚙️ A 36-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
7. 7.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
8. 8.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
9. 9.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) far behind it (c) under the right sensor (d) between the two sensors
10. 10.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
11. 11.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
12. 12.🛞 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) goes straight forward (c) curves to the left
13. 13.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
14. 14.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a light sensor (c) a touch sensor (d) a gyro sensor
15. 15.Which job needs a touch sensor? (a) stop before a wall (b) follow a black line (c) feel a bump into a wall (d) spot a red ball
16. 16.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
18. 18.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 180° (d) 90°
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🧭 A robot faces north. It does: turn right, turn around, turn right. Which way does it face now? (a) west (b) south (c) east (d) north
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
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 180°. It turns right 120°, then left 135°. What does the gyro read now (0° to 359°)?
24. 24.🧭 A robot faces south. It does: turn around, turn right. Which way does it face now? (a) east (b) south (c) north (d) west
25. 25.⚙️ A 12-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
26. 26.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
27. 27.True or false: to feel a bump into a wall, use a light sensor. (a) True (b) False
28. 28.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
29. 29.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
31. 31.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
32. 32.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
33. 33.🧭 A robot should turn right 45°, but its gyro shows it turned 50°. How many degrees must it turn back to the left?
34. 34.📡 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?
35. 35.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
36. 36.🔍 Which sensor helps a robot feel a bump into a wall? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a touch sensor
37. 37.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
38. 38.🔍 Which sensor helps a robot follow a black line? (a) a distance sensor (b) a camera (c) a light sensor (d) a touch sensor
39. 39.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
40. 40.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 90° (d) 45°

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