Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 672 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
2. 2.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.True or false: to measure how far a box is, use a distance sensor. (a) True (b) False
4. 4.Which job needs a temperature sensor? (a) measure how far a box is (b) follow a black line (c) measure a turn angle (d) warn if motors get hot
5. 5.🦾 A servo program runs:
   angle = 70
   angle = angle − 60
   angle = angle + 50
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo program runs:
   angle = 10
   angle = angle + 40
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
8. 8.True or false: “a hospital corridor” suits wheels. (a) False (b) True
9. 9.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
10. 10.🔍 Which sensor helps a robot feel a bump into a wall? (a) a sound sensor (b) a camera (c) a touch sensor (d) a light sensor
11. 11.📡 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 6 seconds (in cm)?
12. 12.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) it goes there and back (c) to make it smaller (d) sound is slow
13. 13.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
14. 14.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
15. 15.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
16. 16.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 180° (d) 360°
17. 17.🛞 Circumference = π × … (a) speed (b) diameter (c) weight (d) radius only
18. 18.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 79. What is under the sensor? (a) the white floor (b) the black line
19. 19.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
20. 20.Which job needs a gyro sensor? (a) measure a turn angle (b) spot a red ball (c) stop before a wall (d) know a button is pressed
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.🦾 A servo moves from 130° to 30°. How many degrees does it turn?
23. 23.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle + 60
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
25. 25.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
26. 26.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a bat (d) a goldfish
27. 27.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
28. 28.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
29. 29.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) white (d) water
30. 30.🧭 A robot should turn right 45°, but its gyro shows it turned 48°. How many degrees must it turn back to the left?
31. 31.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 70. What is under the sensor? (a) the black line (b) the white floor
32. 32.🛞 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) spins right on the spot (b) turns right (c) goes straight forward (d) stays still
33. 33.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
34. 34.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
35. 35.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
37. 37.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
38. 38.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 15. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
40. 40.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spread the weight (c) they are shiny (d) they spin in the air

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