Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 128 · 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: to start on a hand clap, use a light sensor. (a) True (b) False
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) spins right on the spot (b) stays still (c) goes straight back (d) goes straight forward
3. 3.Which of these suits propellers? (a) deep mud (b) moving under water (c) a long factory floor (d) crossing stepping-stones
4. 4.🧭 A robot should turn right 180°, but its gyro shows it turned 176°. How many degrees must it turn more to the right?
5. 5.Which job needs a camera? (a) stay balanced upright (b) spot a red ball (c) start on a hand clap (d) measure how far a box is
6. 6.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
7. 7.⬛ A reading below the threshold means the sensor is over … (a) water (b) black (c) white (d) the sky
8. 8.📡 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?
9. 9.True or false: to follow a black line, use a light sensor. (a) False (b) True
10. 10.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
11. 11.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a distance sensor (c) a camera (d) a gyro sensor
12. 12.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
13. 13.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
14. 14.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
15. 15.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a distance sensor (c) a temperature sensor (d) a gyro sensor
16. 16.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) a wheel (d) an input
17. 17.🛞 Which way of moving suits this best: “deep mud”? (a) wheels (b) legs (c) propellers (d) tracks
18. 18.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.🧭 How many degrees is a half turn (turn around)? (a) 360° (b) 180° (c) 90° (d) 45°
20. 20.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
22. 22.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 360° (d) 90°
23. 23.🛞 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 15 times. How far does the robot roll (in cm)?
24. 24.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
25. 25.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
26. 26.⚙️ A motor makes 200 turns a minute with a 20-tooth gear on it. That gear drives a 100-tooth gear. How many turns a minute does the 100-tooth gear make?
27. 27.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
28. 28.🧭 A robot should turn right 90°, but its gyro shows it turned 92°. How many degrees must it turn back to the left?
29. 29.Which job needs a sound sensor? (a) stop before a wall (b) know a button is pressed (c) follow a black line (d) hear a whistle
30. 30.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) legs (c) wheels (d) propellers
31. 31.True or false: to know a button is pressed, use a distance sensor. (a) False (b) True
32. 32.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a dark tunnel (c) a black surface (d) a white surface
33. 33.🛞 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 15 times. How far does the robot roll (in cm)?
34. 34.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 23. What is under the sensor? (a) the white floor (b) the black line
35. 35.🔍 Which sensor helps a robot hear a whistle? (a) a sound sensor (b) a temperature sensor (c) a camera (d) a touch sensor
36. 36.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
37. 37.📡 A robot is 280 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 14 seconds (in cm)?
38. 38.⚙️ An 8-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
39. 39.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
40. 40.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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