Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 174 · 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 16-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
2. 2.🧭 A robot should turn right 45°, but its gyro shows it turned 58°. How many degrees must it turn back to the left?
3. 3.🧭 A robot faces west. It does: turn left, turn left. Which way does it face now? (a) north (b) west (c) east (d) south
4. 4.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 10 seconds (in cm)?
5. 5.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
6. 6.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
7. 7.⚙️ A motor makes 100 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
8. 8.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) at the same speed (c) not at all (d) slower but stronger
9. 9.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
10. 10.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 792 cm?
11. 11.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) motor volts (d) number of gears
12. 12.True or false: to start on a hand clap, use a temperature sensor. (a) False (b) True
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 60. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
14. 14.🧭 A robot spins 15° every second. How many seconds does it take to turn 330°?
15. 15.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
16. 16.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
17. 17.🛞 Why do most indoor robots use wheels? (a) they float (b) they look funny (c) fast and easy on floors (d) they climb stairs
18. 18.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🧭 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 180°. It turns left 60°, then left 90°, then right 180°. What does the gyro read now (0° to 359°)?
23. 23.True or false: “a long factory floor” suits propellers. (a) False (b) True
24. 24.⚙️ A motor makes 550 turns a minute with a 15-tooth gear on it. That gear drives a 75-tooth gear. How many turns a minute does the 75-tooth gear make?
25. 25.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🧭 What does a gyro help a robot do? (a) smell smoke (b) see colours (c) hear claps (d) turn by exact angles
27. 27.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
28. 28.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
29. 29.🔍 Which sensor helps a robot follow a black line? (a) a gyro sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
30. 30.True or false: to know a button is pressed, use a gyro sensor. (a) True (b) False
31. 31.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
32. 32.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points left (c) points right (d) points straight up
33. 33.Which of these suits propellers? (a) hovering over a roof (b) a flat road (c) crossing stepping-stones (d) a hospital corridor
34. 34.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an input (c) a gear (d) an output
35. 35.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
36. 36.🛞 Circumference = π × … (a) speed (b) diameter (c) weight (d) radius only
37. 37.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
38. 38.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1188 cm?
39. 39.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
40. 40.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?

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