Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 649 · 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 distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.Which job needs a light sensor? (a) measure how far a box is (b) follow a black line (c) start on a hand clap (d) spot a red ball
3. 3.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.🦾 A servo moves from 160° to 140°. How many degrees does it turn?
5. 5.📡 A robot is 190 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 10 seconds (in cm)?
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
7. 7.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) it goes there and back (c) sound is slow (d) to make it smaller
8. 8.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
9. 9.True or false: to hear a whistle, use a camera. (a) False (b) True
10. 10.🧭 What does a gyro help a robot do? (a) turn by exact angles (b) smell smoke (c) see colours (d) hear claps
11. 11.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) big (slow and strong) (d) never important
12. 12.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
13. 13.🛞 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) turns left (b) goes straight back (c) goes straight forward (d) turns right
14. 14.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
15. 15.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 34 cm (d) 1 km
16. 16.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.🛞 Why do most indoor robots use wheels? (a) they float (b) they climb stairs (c) fast and easy on floors (d) they look funny
19. 19.Which job needs a gyro sensor? (a) follow a black line (b) start on a hand clap (c) hear a whistle (d) measure a turn angle
20. 20.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
21. 21.🔍 What does a gyro sensor measure? (a) temperature (b) colour (c) sound (d) turning (rotation)
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
23. 23.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 90° (d) 180°
24. 24.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
25. 25.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
26. 26.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
27. 27.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 180° (d) 90°
28. 28.🧭 A robot should turn right 180°, but its gyro shows it turned 189°. How many degrees must it turn back to the left?
29. 29.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) turns left (b) goes straight back (c) stays still (d) spins left on the spot
30. 30.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
31. 31.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a caster wheel (d) a track
32. 32.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
33. 33.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🛞 Which way of moving suits this best: “hovering over a roof”? (a) wheels (b) tracks (c) legs (d) propellers
35. 35.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) small drives big (b) big drives small
36. 36.🔍 Which sensor helps a robot hear a whistle? (a) a camera (b) a sound sensor (c) a touch sensor (d) a light sensor
37. 37.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
38. 38.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.True or false: “a long factory floor” suits legs. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

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