Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 663 · 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 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 right (b) points up and right (c) points up and left (d) points left
2. 2.🔍 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
3. 3.Which job needs a light sensor? (a) stop before a wall (b) know a button is pressed (c) follow a black line (d) measure how far a box is
4. 4.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
5. 5.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
6. 6.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
7. 7.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) tracks (c) propellers (d) legs
8. 8.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 74. What is under the sensor? (a) the white floor (b) the black line
9. 9.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
10. 10.🔍 Which sensor helps a robot spot a red ball? (a) a touch sensor (b) a gyro sensor (c) a sound sensor (d) a camera
11. 11.⚙️ 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
12. 12.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.True or false: “a hospital corridor” suits wheels. (a) True (b) False
14. 14.📡 A robot is 270 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 25 seconds (in cm)?
15. 15.True or false: to follow a black line, use a light sensor. (a) True (b) False
16. 16.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
17. 17.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) smell smoke (d) hear claps
18. 18.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
19. 19.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) never important (d) small (fast, weak)
20. 20.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its weight (c) its circumference (d) its diameter
21. 21.🧭 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 90°. It turns left 120°, then left 45°. What does the gyro read now (0° to 359°)?
22. 22.True or false: to spot a red ball, use a camera. (a) False (b) True
23. 23.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight forward (b) spins right on the spot (c) turns left (d) stays still
24. 24.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
26. 26.🧭 A robot should turn right 45°, but its gyro shows it turned 35°. How many degrees must it turn more to the right?
27. 27.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) too fast on floors (c) they are too cheap (d) harder to balance
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
29. 29.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
30. 30.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.Which job needs a gyro sensor? (a) find the brightest spot (b) follow a black line (c) spot a red ball (d) stay balanced upright
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
33. 33.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
35. 35.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
36. 36.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
37. 37.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) spokes (c) pins (d) teeth
38. 38.📡 A robot is 110 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
39. 39.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
40. 40.📡 An object is 238 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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