Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 661 · 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.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
2. 2.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) tracks (b) wheels (c) legs (d) propellers
3. 3.Which job needs a sound sensor? (a) follow a black line (b) stop before a wall (c) hear a whistle (d) warn if motors get hot
4. 4.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) under the right sensor (c) between the two sensors (d) far behind it
7. 7.🛞 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) goes straight back (b) turns left (c) stays still (d) goes straight forward
8. 8.🧭 What does a gyro help a robot do? (a) hear claps (b) see colours (c) turn by exact angles (d) smell smoke
9. 9.Which of these suits tracks? (a) a long factory floor (b) a muddy building site (c) a field of tall boulders (d) flying over a field
10. 10.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
11. 11.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
12. 12.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
13. 13.🧭 A robot should turn right 180°, but its gyro shows it turned 191°. How many degrees must it turn back to the left?
14. 14.🔍 Which sensor helps a robot measure a turn angle? (a) a touch sensor (b) a gyro sensor (c) a light sensor (d) a temperature sensor
15. 15.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) bright light (d) water drops
16. 16.🦾 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 up and right (b) points up and left (c) points right (d) points left
17. 17.🧭 How many degrees is a right-angle turn? (a) 45° (b) 180° (c) 360° (d) 90°
18. 18.Which job needs a temperature sensor? (a) stop before a wall (b) warn if motors get hot (c) find the brightest spot (d) hear a whistle
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
20. 20.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
21. 21.🛞 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 9 times. How far does the robot roll (in cm)?
22. 22.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
23. 23.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
24. 24.📡 A robot is 150 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 12 seconds (in cm)?
25. 25.⚙️ 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
26. 26.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 72. What is under the sensor? (a) the white floor (b) the black line
27. 27.🛞 Why do most indoor robots use wheels? (a) they float (b) they climb stairs (c) fast and easy on floors (d) they look funny
28. 28.🧭 A robot spins 45° every second. How many seconds does it take to turn 135°?
29. 29.🧭 A robot should turn right 45°, but its gyro shows it turned 43°. How many degrees must it turn more to the right?
30. 30.📡 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?
31. 31.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) a wheel (d) an output
32. 32.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) anticlockwise (b) clockwise
33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
34. 34.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
35. 35.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
36. 36.🛞 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 left (c) goes straight back (d) stays still
37. 37.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
38. 38.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
39. 39.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
40. 40.🔍 Which sensor helps a robot warn if motors get hot? (a) a touch sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids