Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 803 · 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: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 15. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
3. 3.🧭 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 right 90°, then right 30°. What does the gyro read now (0° to 359°)?
4. 4.🛞 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)?
5. 5.🧭 A robot should turn right 45°, but its gyro shows it turned 36°. How many degrees must it turn more to the right?
6. 6.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
7. 7.📡 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 11 seconds (in cm)?
8. 8.🔍 Which sensor helps a robot know a button is pressed? (a) a light sensor (b) a temperature sensor (c) a touch sensor (d) a sound sensor
9. 9.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times slower (d) 3 times bigger
10. 10.Which of these suits tracks? (a) a flat road (b) a field of tall boulders (c) crossing stepping-stones (d) deep mud
11. 11.True or false: “moving under water” suits legs. (a) True (b) False
12. 12.🛞 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)? =
13. 13.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
15. 15.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
19. 19.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.⚙️ A motor makes 30 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
21. 21.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
22. 22.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
23. 23.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.Which of these suits propellers? (a) deep mud (b) hovering over a roof (c) stepping over wide gaps (d) a smooth classroom floor
26. 26.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) a wheel (d) an output
27. 27.🧭 A robot faces north. It does: turn left, turn right, turn right. Which way does it face now? (a) east (b) south (c) west (d) north
28. 28.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
29. 29.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns left (b) turns right (c) spins left on the spot (d) stays still
30. 30.Which of these suits tracks? (a) a hospital corridor (b) soft snow (c) a smooth classroom floor (d) flying over a field
31. 31.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 34. What is under the sensor? (a) the white floor (b) the black line
32. 32.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
33. 33.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
36. 36.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) radio music (c) water drops (d) bright light
37. 37.Which job needs a camera? (a) find the brightest spot (b) follow a black line (c) hear a whistle (d) spot a red ball
38. 38.🛞 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) spins right on the spot (c) spins left on the spot (d) goes straight forward
39. 39.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black line (c) a dark tunnel (d) a black surface
40. 40.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?

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