Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 321 · 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.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
2. 2.📡 A robot is 130 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 22 seconds (in cm)?
3. 3.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 36. What is under the sensor? (a) the black line (b) the white floor
4. 4.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
5. 5.⚙️ A motor makes 280 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
7. 7.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
9. 9.🔍 Which sensor helps a robot measure how far a box is? (a) a distance sensor (b) a light sensor (c) a gyro sensor (d) a touch sensor
10. 10.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
11. 11.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 180° (d) 90°
12. 12.True or false: to measure a turn angle, use a temperature sensor. (a) False (b) True
13. 13.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a goldfish (d) a snail
15. 15.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a gyro sensor (c) a temperature sensor (d) a distance sensor
16. 16.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) an input (d) a wheel
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.🛞 Which way of moving suits this best: “loose sand dunes”? (a) tracks (b) legs (c) propellers (d) wheels
19. 19.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) spins right on the spot (b) goes straight forward (c) turns left (d) spins left on the spot
20. 20.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 15. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
22. 22.True or false: “loose sand dunes” suits wheels. (a) False (b) True
23. 23.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) stays still (b) goes straight forward (c) spins left on the spot (d) turns right
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 15 times. How far does the robot roll (in cm)?
26. 26.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
27. 27.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a gyro sensor (c) a touch sensor (d) a distance sensor
28. 28.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
29. 29.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
30. 30.True or false: to follow a black line, use a light sensor. (a) True (b) False
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
32. 32.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) backwards (c) slower (d) nowhere
33. 33.🔍 Which sensor helps a robot find the brightest spot? (a) a sound sensor (b) a gyro sensor (c) a light sensor (d) a temperature sensor
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
35. 35.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
36. 36.True or false: “the output turns slower” happens when a small gear drives a big one. (a) True (b) False
37. 37.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
38. 38.True or false: to know a button is pressed, use a sound sensor. (a) False (b) True
39. 39.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 65. What is under the sensor? (a) the white floor (b) the black line
40. 40.⚙️ A 15-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower

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