Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 662 · 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.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
2. 2.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 64. What is under the sensor? (a) the white floor (b) the black line
3. 3.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
4. 4.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a cow (d) a bat
5. 5.🔍 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
6. 6.True or false: to measure how far a box is, use a distance sensor. (a) False (b) True
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
8. 8.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
9. 9.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the right sensor (b) under the left sensor (c) far behind it (d) between the two sensors
10. 10.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 70. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
11. 11.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) at the same speed (c) faster but weaker (d) slower but stronger
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
13. 13.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
14. 14.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) tracks (c) legs (d) wheels
15. 15.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
16. 16.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
17. 17.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
18. 18.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
20. 20.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
21. 21.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
22. 22.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero
23. 23.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 49. What is under the sensor? (a) the black line (b) the white floor
24. 24.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
25. 25.Which job needs a sound sensor? (a) start on a hand clap (b) measure a turn angle (c) follow a black line (d) feel a bump into a wall
26. 26.🧭 A robot spins 45° every second. How many seconds does it take to turn 225°?
27. 27.⚙️ A motor makes 250 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
29. 29.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) one wheel runs faster (c) it stops for ever (d) it jumps
30. 30.⚙️ A 30-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
31. 31.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) tracks (c) propellers (d) legs
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 30 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
33. 33.True or false: “moving under water” suits propellers. (a) False (b) True
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
35. 35.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
36. 36.True or false: “hovering over a roof” suits wheels. (a) True (b) False
37. 37.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
38. 38.Which job needs a touch sensor? (a) hear a whistle (b) stop before a wall (c) feel a bump into a wall (d) follow a black line
39. 39.📡 A robot is 230 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 11 seconds (in cm)?
40. 40.🧭 A robot faces west. It does: turn left, turn around. Which way does it face now? (a) south (b) east (c) north (d) west

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