Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 867 · 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 robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.Which job needs a gyro sensor? (a) start on a hand clap (b) follow a black line (c) spot a red ball (d) stay balanced upright
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
4. 4.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
5. 5.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) legs (c) wheels (d) propellers
6. 6.🧭 A robot spins 60° every second. How many seconds does it take to turn 180°?
7. 7.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
8. 8.🦾 A servo program runs:
   angle = 180
   angle = angle − 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
10. 10.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
11. 11.🛞 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 backward. What does the robot do? (a) goes straight back (b) turns left (c) spins right on the spot (d) stays still
12. 12.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 3 cm (d) 1 km
13. 13.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its radius (c) its diameter (d) its weight
14. 14.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a metal door (d) a flat wall
15. 15.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and right (b) points straight up (c) points left (d) points right
16. 16.🔍 Which sensor helps a robot start on a hand clap? (a) a temperature sensor (b) a sound sensor (c) a touch sensor (d) a camera
17. 17.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
18. 18.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
19. 19.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times faster (d) 3 times slower
20. 20.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
21. 21.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
22. 22.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
23. 23.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
24. 24.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
25. 25.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
26. 26.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) at the same speed (c) not at all (d) faster and weaker
27. 27.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
28. 28.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) harder to balance (c) they are too cheap (d) too fast on floors
29. 29.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 40
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.Which job needs a light sensor? (a) measure how far a box is (b) stop before a wall (c) spot a red ball (d) follow a black line
31. 31.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
32. 32.🧭 What does a gyro help a robot do? (a) see colours (b) hear claps (c) smell smoke (d) turn by exact angles
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
34. 34.🔍 Which sensor helps a robot stay balanced upright? (a) a camera (b) a touch sensor (c) a gyro sensor (d) a light sensor
35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
37. 37.Which of these suits propellers? (a) a muddy building site (b) a hospital corridor (c) deep mud (d) hovering over a roof
38. 38.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
39. 39.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 24. What is under the sensor? (a) the white floor (b) the black line
40. 40.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 65. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor

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