Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 272 · 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.🔍 Which sensor helps a robot spot a red ball? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a camera
2. 2.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
3. 3.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
4. 4.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
5. 5.Which job needs a camera? (a) stop before a wall (b) spot a red ball (c) warn if motors get hot (d) hear a whistle
6. 6.🦾 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 left (b) points right (c) points straight up (d) points up and right
7. 7.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
8. 8.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
9. 9.📡 A robot is 300 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 10 seconds (in cm)?
10. 10.Which job needs a touch sensor? (a) warn if motors get hot (b) spot a red ball (c) read a QR code (d) feel a bump into a wall
11. 11.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
13. 13.🔍 Which sensor helps a robot know a button is pressed? (a) a touch sensor (b) a light sensor (c) a gyro sensor (d) a camera
14. 14.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
15. 15.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
16. 16.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
17. 17.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
18. 18.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a black surface (c) a black line (d) a white surface
19. 19.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
20. 20.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.🧭 How many degrees is a full turn? (a) 180° (b) 100° (c) 360° (d) 90°
22. 22.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points right (b) points up and left (c) points left (d) points straight up
23. 23.🦾 A servo moves from 10° to 50°. How many degrees does it turn?
24. 24.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
25. 25.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.🛞 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) spins right on the spot (b) stays still (c) goes straight back (d) goes straight forward
27. 27.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
28. 28.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 4 (d) 2
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
31. 31.Which job needs a temperature sensor? (a) follow a black line (b) feel a bump into a wall (c) warn if motors get hot (d) measure a turn angle
32. 32.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
33. 33.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
34. 34.True or false: to follow a black line, use a light sensor. (a) False (b) True
35. 35.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
36. 36.True or false: “flying over a field” suits legs. (a) False (b) True
37. 37.🛞 Which way of moving suits this best: “deep mud”? (a) propellers (b) legs (c) tracks (d) wheels
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 60. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) neither sensor (d) the right sensor
39. 39.True or false: “a long factory floor” suits wheels. (a) False (b) True
40. 40.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise

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