Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 343 · 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 reading below the threshold means the sensor is over … (a) water (b) the sky (c) black (d) white
2. 2.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
3. 3.🧭 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 30°, then right 135°. What does the gyro read now (0° to 359°)?
4. 4.🛞 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 3 times. How far does the robot roll (in cm)?
5. 5.🧭 A robot should turn right 90°, but its gyro shows it turned 85°. How many degrees must it turn more to the right?
6. 6.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
7. 7.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the wheel size (c) the top speed (d) the battery size
8. 8.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
9. 9.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) small (fast, weak) (d) zero
10. 10.🧭 A robot faces south. It does: turn right, turn left, turn right. Which way does it face now? (a) east (b) north (c) south (d) west
11. 11.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they are shiny (c) they are round (d) they spread the weight
12. 12.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they are too cheap (d) they never tire
13. 13.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 7/22 (c) 2/7 (d) 22/7
14. 14.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a soft foam cushion (d) a metal door
16. 16.📡 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)?
17. 17.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
18. 18.🔍 Which sensor helps a robot hear a whistle? (a) a camera (b) a sound sensor (c) a touch sensor (d) a gyro sensor
19. 19.🛞 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) goes straight forward (b) turns right (c) goes straight back (d) stays still
20. 20.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
21. 21.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
22. 22.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
23. 23.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
24. 24.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
25. 25.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
26. 26.True or false: to hear a whistle, use a touch sensor. (a) False (b) True
27. 27.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
28. 28.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it uses a sail (c) it stops for ever (d) one wheel runs faster
29. 29.🛞 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 forward. What does the robot do? (a) spins right on the spot (b) goes straight back (c) goes straight forward (d) spins left on the spot
30. 30.🧭 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 90°, then right 180°, then left 60°. What does the gyro read now (0° to 359°)?
31. 31.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) the same direction (d) in opposite directions
32. 32.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the right sensor (c) under the left sensor (d) far behind it
33. 33.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
34. 34.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
35. 35.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 360° (d) 45°
36. 36.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
38. 38.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
39. 39.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
40. 40.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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