Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 76 · 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 reading below the threshold means the sensor is over … (a) black (b) the sky (c) water (d) white
2. 2.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
5. 5.⚙️ A 12-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
6. 6.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it jumps (c) one wheel runs faster (d) it uses a sail
7. 7.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 1100 cm?
8. 8.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 45° (c) 180° (d) 90°
9. 9.⚙️ A 24-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
10. 10.Which job needs a gyro sensor? (a) know a button is pressed (b) find the brightest spot (c) stay balanced upright (d) spot a red ball
11. 11.True or false: “a hospital corridor” suits wheels. (a) True (b) False
12. 12.📡 A robot is 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 11 seconds (in cm)?
13. 13.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
14. 14.True or false: to follow a black line, use a distance sensor. (a) False (b) True
15. 15.🛞 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 forward. What does the robot do? (a) goes straight back (b) turns left (c) spins left on the spot (d) stays still
16. 16.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
18. 18.True or false: “flying over a field” suits wheels. (a) True (b) False
19. 19.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
20. 20.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) not at all (c) faster and weaker (d) slower but stronger
21. 21.🔍 Which sensor helps a robot warn if motors get hot? (a) a distance sensor (b) a temperature sensor (c) a camera (d) a gyro sensor
22. 22.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
23. 23.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
24. 24.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
25. 25.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a sound sensor (c) a touch sensor (d) a gyro sensor
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 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 left (c) curves to the right
27. 27.⚙️ 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 big driver gear (b) a small driver gear
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 95. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
29. 29.🧭 A robot faces west. It does: turn around, turn around. Which way does it face now? (a) east (b) north (c) west (d) south
30. 30.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
31. 31.Which job needs a light sensor? (a) warn if motors get hot (b) start on a hand clap (c) stay balanced upright (d) find the brightest spot
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
33. 33.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
35. 35.True or false: to know a button is pressed, use a distance sensor. (a) True (b) False
36. 36.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 45° (d) 360°
37. 37.🔍 Which sensor helps a robot measure how far a box is? (a) a temperature sensor (b) a light sensor (c) a camera (d) a distance sensor
38. 38.🧭 A robot spins 30° every second. How many seconds does it take to turn 300°?
39. 39.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 154 cm?
40. 40.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) at the same speed (c) not at all (d) slower but stronger

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