Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 564 · 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.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 35. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
3. 3.🧭 How many degrees is a right-angle turn? (a) 360° (b) 180° (c) 90° (d) 45°
4. 4.Which job needs a distance sensor? (a) measure a turn angle (b) find the brightest spot (c) measure how far a box is (d) spot a red ball
5. 5.🔍 Which sensor helps a robot warn if motors get hot? (a) a gyro sensor (b) a temperature sensor (c) a sound sensor (d) a touch sensor
6. 6.⬛ The threshold of a light sensor is … (a) the wheel size (b) the top speed (c) the battery size (d) the black/white cut-off
7. 7.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
8. 8.True or false: to read a QR code, use a temperature sensor. (a) True (b) False
9. 9.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
10. 10.🔍 Which sensor helps a robot measure a turn angle? (a) a touch sensor (b) a sound sensor (c) a temperature sensor (d) a gyro sensor
11. 11.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
12. 12.True or false: to stop before a wall, use a camera. (a) True (b) False
13. 13.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
14. 14.Which job needs a light sensor? (a) follow a black line (b) start on a hand clap (c) measure how far a box is (d) stay balanced upright
15. 15.🧭 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 0°. It turns left 180°, then right 135°. What does the gyro read now (0° to 359°)?
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
17. 17.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 35. What is under the sensor? (a) the black line (b) the white floor
18. 18.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
19. 19.True or false: “stepping over wide gaps” suits wheels. (a) False (b) True
20. 20.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
21. 21.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
22. 22.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) False (b) True
23. 23.📡 A robot is 130 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
24. 24.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
25. 25.⚙️ A 24-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
26. 26.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a touch sensor (d) a gyro sensor
27. 27.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
28. 28.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
29. 29.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black line (c) a black surface (d) a dark tunnel
30. 30.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points straight up (c) points up and right (d) points right
31. 31.Which job needs a temperature sensor? (a) warn if motors get hot (b) spot a red ball (c) follow a black line (d) measure how far a box is
32. 32.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
33. 33.⚙️ A motor makes 600 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?
34. 34.⚙️ A motor makes 80 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
35. 35.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 34 cm (c) 1 km (d) 340 cm
37. 37.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) faster (c) nowhere (d) backwards
38. 38.⚙️ A 12-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
39. 39.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
40. 40.🔍 Which sensor helps a robot spot a red ball? (a) a camera (b) a touch sensor (c) a sound sensor (d) a light sensor

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