Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 943 · 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.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 1 (d) 4
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) stays still (b) turns left (c) spins right on the spot (d) goes straight forward
3. 3.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
4. 4.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 34 cm (c) 1 km (d) 340 cm
5. 5.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
6. 6.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 360° (c) 90° (d) 180°
8. 8.⚙️ A 36-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
9. 9.🔍 Which sensor helps a robot measure how far a box is? (a) a distance sensor (b) a touch sensor (c) a light sensor (d) a sound sensor
10. 10.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
11. 11.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 2 seconds (in cm)?
12. 12.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
13. 13.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 100° (d) 360°
14. 14.True or false: to know a button is pressed, use a temperature sensor. (a) True (b) False
15. 15.True or false: to measure a turn angle, use a touch sensor. (a) True (b) False
16. 16.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) anticlockwise (b) clockwise
17. 17.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
18. 18.True or false: to find the brightest spot, use a gyro sensor. (a) True (b) False
19. 19.⚙️ A 15-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
20. 20.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
21. 21.📡 A robot is 210 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 6 seconds (in cm)?
22. 22.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
23. 23.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 21. What is under the sensor? (a) the white floor (b) the black line
24. 24.🧭 A robot should turn right 90°, but its gyro shows it turned 84°. How many degrees must it turn more to the right?
25. 25.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
26. 26.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
28. 28.🧭 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 270°. It turns right 120°, then left 180°, then left 30°. What does the gyro read now (0° to 359°)?
29. 29.True or false: “moving under water” suits legs. (a) False (b) True
30. 30.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) big (slow and strong) (d) zero
31. 31.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
32. 32.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
33. 33.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
34. 34.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a track (c) a caster wheel (d) a gear
35. 35.🦾 A servo moves from 180° to 70°. How many degrees does it turn?
36. 36.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) fast and easy on floors (d) they climb stairs
37. 37.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) not at all (c) slower but stronger (d) at the same speed
38. 38.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 176 cm?
39. 39.🔍 Which sensor helps a robot spot a red ball? (a) a gyro sensor (b) a sound sensor (c) a camera (d) a distance sensor
40. 40.🧭 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 45°, then right 30°. What does the gyro read now (0° to 359°)?

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